Merge tag 'tty-5.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial driver updates from Greg KH: "Here is the tty and serial driver updates for 5.8-rc1 Nothing huge at all, just a lot of little serial driver fixes, updates for new devices and features, and other small things. Full details are in the shortlog. All of these have been in linux-next with no issues for a while" * tag 'tty-5.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (67 commits) tty: serial: qcom_geni_serial: Add 51.2MHz frequency support tty: serial: imx: clear Ageing Timer Interrupt in handler serial: 8250_fintek: Add F81966 Support sc16is7xx: Add flag to activate IrDA mode dt-bindings: sc16is7xx: Add flag to activate IrDA mode serial: 8250: Support rs485 bus termination GPIO serial: 8520_port: Fix function param documentation dt-bindings: serial: Add binding for rs485 bus termination GPIO vt: keyboard: avoid signed integer overflow in k_ascii serial: 8250: Enable 16550A variants by default on non-x86 tty: hvc_console, fix crashes on parallel open/close serial: imx: Initialize lock for non-registered console sc16is7xx: Read the LSR register for basic device presence check sc16is7xx: Allow sharing the IRQ line sc16is7xx: Use threaded IRQ sc16is7xx: Always use falling edge IRQ tty: n_gsm: Fix bogus i++ in gsm_data_kick tty: n_gsm: Remove unnecessary test in gsm_print_packet() serial: stm32: add no_console_suspend support tty: serial: fsl_lpuart: Use __maybe_unused instead of #if CONFIG_PM_SLEEP ...
author: Linus Torvalds <torvalds@linux-foundation.org> 2020-06-07 09:52:36 -0700
committer: Linus Torvalds <torvalds@linux-foundation.org> 2020-06-07 09:52:36 -0700
commit: 081096d98bb23946f16215357b141c5616b234bf (patch)
tree: 23638d3369fa0c424c1eae203b4c5821281bd2c1
parent: e611c0fe318c6d6827ee2bba660fbc23cf73f7dc (diff)
parent: a1b44ea340b21c99b34c93acad233da727cb88ba (diff)
47 files changed, 619 insertions, 331 deletions
diff --git a/Documentation/admin-guide/sysrq.rst b/Documentation/admin-guide/sysrq.rst
index a46209f4636c..e6424d8c5846 100644
--- a/Documentation/admin-guide/sysrq.rst
+++ b/Documentation/admin-guide/sysrq.rst
@@ -231,13 +231,13 @@ prints help, and C) an action_msg string, that will print right before your
 handler is called. Your handler must conform to the prototype in 'sysrq.h'.
 
 After the ``sysrq_key_op`` is created, you can call the kernel function
-``register_sysrq_key(int key, struct sysrq_key_op *op_p);`` this will
+``register_sysrq_key(int key, const struct sysrq_key_op *op_p);`` this will
 register the operation pointed to by ``op_p`` at table key 'key',
 if that slot in the table is blank. At module unload time, you must call
-the function ``unregister_sysrq_key(int key, struct sysrq_key_op *op_p)``, which
-will remove the key op pointed to by 'op_p' from the key 'key', if and only if
-it is currently registered in that slot. This is in case the slot has been
-overwritten since you registered it.
+the function ``unregister_sysrq_key(int key, const struct sysrq_key_op *op_p)``,
+which will remove the key op pointed to by 'op_p' from the key 'key', if and
+only if it is currently registered in that slot. This is in case the slot has
+been overwritten since you registered it.
 
 The Magic SysRQ system works by registering key operations against a key op
 lookup table, which is defined in 'drivers/tty/sysrq.c'. This key table has
diff --git a/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
index c1091a923a89..0fa8e3e43bf8 100644
--- a/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
+++ b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
@@ -21,6 +21,8 @@ Optional properties:
   the second cell is used to specify the GPIO polarity:
     0 = active high,
     1 = active low.
+- irda-mode-ports: An array that lists the indices of the port that
+		   should operate in IrDA mode.
 
 Example:
         sc16is750: sc16is750@51 {
@@ -55,6 +57,8 @@ Optional properties:
   the second cell is used to specify the GPIO polarity:
     0 = active high,
     1 = active low.
+- irda-mode-ports: An array that lists the indices of the port that
+		   should operate in IrDA mode.
 
 Example:
 	sc16is750: sc16is750@0 {
diff --git a/Documentation/devicetree/bindings/serial/rs485.yaml b/Documentation/devicetree/bindings/serial/rs485.yaml
index 8141e4aad530..fe90569475e1 100644
--- a/Documentation/devicetree/bindings/serial/rs485.yaml
+++ b/Documentation/devicetree/bindings/serial/rs485.yaml
@@ -41,4 +41,8 @@ properties:
   rs485-rx-during-tx:
     description: enables the receiving of data even while sending data.
     $ref: /schemas/types.yaml#/definitions/flag
+
+  rs485-term-gpios:
+    description: GPIO pin to enable RS485 bus termination.
+    maxItems: 1
 ...
diff --git a/Documentation/devicetree/bindings/serial/samsung_uart.yaml b/Documentation/devicetree/bindings/serial/samsung_uart.yaml
index ff2f49fe322c..32a5e1e30833 100644
--- a/Documentation/devicetree/bindings/serial/samsung_uart.yaml
+++ b/Documentation/devicetree/bindings/serial/samsung_uart.yaml
@@ -29,6 +29,14 @@ properties:
   reg:
     maxItems: 1
 
+  reg-io-width:
+    description: |
+      The size (in bytes) of the IO accesses that should be performed
+      on the device.
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32
+      - enum: [ 1, 4 ]
+
   clocks:
     minItems: 2
     maxItems: 5
diff --git a/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml b/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
index 238c44192d31..75b8521eb7cb 100644
--- a/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
+++ b/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
@@ -48,6 +48,12 @@ properties:
     minItems: 1
     maxItems: 2
 
+  cts-gpios:
+    maxItems: 1
+
+  rts-gpios:
+    maxItems: 1
+
   wakeup-source: true
 
   rs485-rts-delay: true
@@ -55,6 +61,14 @@ properties:
   linux,rs485-enabled-at-boot-time: true
   rs485-rx-during-tx: true
 
+if:
+  required:
+    - st,hw-flow-ctrl
+then:
+  properties:
+    cts-gpios: false
+    rts-gpios: false
+
 required:
   - compatible
   - reg
diff --git a/arch/alpha/kernel/setup.c b/arch/alpha/kernel/setup.c
index f19aa577354b..6fa802c495b4 100644
--- a/arch/alpha/kernel/setup.c
+++ b/arch/alpha/kernel/setup.c
@@ -430,6 +430,15 @@ register_cpus(void)
 
 arch_initcall(register_cpus);
 
+#ifdef CONFIG_MAGIC_SYSRQ
+static const struct sysrq_key_op srm_sysrq_reboot_op = {
+	.handler	= machine_halt,
+	.help_msg       = "reboot(b)",
+	.action_msg     = "Resetting",
+	.enable_mask    = SYSRQ_ENABLE_BOOT,
+};
+#endif
+
 void __init
 setup_arch(char **cmdline_p)
 {
@@ -550,8 +559,8 @@ setup_arch(char **cmdline_p)
 	/* If we're using SRM, make sysrq-b halt back to the prom,
 	   not auto-reboot.  */
 	if (alpha_using_srm) {
-		struct sysrq_key_op *op = __sysrq_get_key_op('b');
-		op->handler = (void *) machine_halt;
+		unregister_sysrq_key('b', __sysrq_reboot_op);
+		register_sysrq_key('b', &srm_sysrq_reboot_op);
 	}
 #endif
 
diff --git a/arch/mips/kernel/sysrq.c b/arch/mips/kernel/sysrq.c
index e5a2a6ab71ac..9c1a2019113b 100644
--- a/arch/mips/kernel/sysrq.c
+++ b/arch/mips/kernel/sysrq.c
@@ -52,7 +52,7 @@ static void sysrq_handle_tlbdump(int key)
 #endif
 }
 
-static struct sysrq_key_op sysrq_tlbdump_op = {
+static const struct sysrq_key_op sysrq_tlbdump_op = {
 	.handler        = sysrq_handle_tlbdump,
 	.help_msg       = "show-tlbs(x)",
 	.action_msg     = "Show TLB entries",
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index a001711863e5..bfd152933376 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -3919,7 +3919,7 @@ static void sysrq_handle_xmon(int key)
 		xmon_init(0);
 }
 
-static struct sysrq_key_op sysrq_xmon_op = {
+static const struct sysrq_key_op sysrq_xmon_op = {
 	.handler =	sysrq_handle_xmon,
 	.help_msg =	"xmon(x)",
 	.action_msg =	"Entering xmon",
diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c
index 4282116e28e7..423011e60982 100644
--- a/arch/sparc/kernel/process_64.c
+++ b/arch/sparc/kernel/process_64.c
@@ -313,7 +313,7 @@ static void sysrq_handle_globreg(int key)
 	trigger_all_cpu_backtrace();
 }
 
-static struct sysrq_key_op sparc_globalreg_op = {
+static const struct sysrq_key_op sparc_globalreg_op = {
 	.handler	= sysrq_handle_globreg,
 	.help_msg	= "global-regs(y)",
 	.action_msg	= "Show Global CPU Regs",
@@ -388,7 +388,7 @@ static void sysrq_handle_globpmu(int key)
 	pmu_snapshot_all_cpus();
 }
 
-static struct sysrq_key_op sparc_globalpmu_op = {
+static const struct sysrq_key_op sparc_globalpmu_op = {
 	.handler	= sysrq_handle_globpmu,
 	.help_msg	= "global-pmu(x)",
 	.action_msg	= "Show Global PMU Regs",
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 02fc24026872..170aa7689110 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -307,13 +307,13 @@ static void drm_fb_helper_sysrq(int dummy1)
 	schedule_work(&drm_fb_helper_restore_work);
 }
 
-static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
+static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 	.handler = drm_fb_helper_sysrq,
 	.help_msg = "force-fb(V)",
 	.action_msg = "Restore framebuffer console",
 };
 #else
-static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
+static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 #endif
 
 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c
index 436cc51c92c3..cdcc64ea2554 100644
--- a/drivers/tty/hvc/hvc_console.c
+++ b/drivers/tty/hvc/hvc_console.c
@@ -371,15 +371,14 @@ static int hvc_open(struct tty_struct *tty, struct file * filp)
 	 * tty fields and return the kref reference.
 	 */
 	if (rc) {
-		tty_port_tty_set(&hp->port, NULL);
-		tty->driver_data = NULL;
-		tty_port_put(&hp->port);
 		printk(KERN_ERR "hvc_open: request_irq failed with rc %d.\n", rc);
-	} else
+	} else {
 		/* We are ready... raise DTR/RTS */
 		if (C_BAUD(tty))
 			if (hp->ops->dtr_rts)
 				hp->ops->dtr_rts(hp, 1);
+		tty_port_set_initialized(&hp->port, true);
+	}
 
 	/* Force wakeup of the polling thread */
 	hvc_kick();
@@ -389,22 +388,12 @@ static int hvc_open(struct tty_struct *tty, struct file * filp)
 
 static void hvc_close(struct tty_struct *tty, struct file * filp)
 {
-	struct hvc_struct *hp;
+	struct hvc_struct *hp = tty->driver_data;
 	unsigned long flags;
 
 	if (tty_hung_up_p(filp))
 		return;
 
-	/*
-	 * No driver_data means that this close was issued after a failed
-	 * hvc_open by the tty layer's release_dev() function and we can just
-	 * exit cleanly because the kref reference wasn't made.
-	 */
-	if (!tty->driver_data)
-		return;
-
-	hp = tty->driver_data;
-
 	spin_lock_irqsave(&hp->port.lock, flags);
 
 	if (--hp->port.count == 0) {
@@ -412,6 +401,9 @@ static void hvc_close(struct tty_struct *tty, struct file * filp)
 		/* We are done with the tty pointer now. */
 		tty_port_tty_set(&hp->port, NULL);
 
+		if (!tty_port_initialized(&hp->port))
+			return;
+
 		if (C_HUPCL(tty))
 			if (hp->ops->dtr_rts)
 				hp->ops->dtr_rts(hp, 0);
@@ -428,6 +420,7 @@ static void hvc_close(struct tty_struct *tty, struct file * filp)
 		 * waking periodically to check chars_in_buffer().
 		 */
 		tty_wait_until_sent(tty, HVC_CLOSE_WAIT);
+		tty_port_set_initialized(&hp->port, false);
 	} else {
 		if (hp->port.count < 0)
 			printk(KERN_ERR "hvc_close %X: oops, count is %d\n",
diff --git a/drivers/tty/hvc/hvcs.c b/drivers/tty/hvc/hvcs.c
index ee0604cd9c6b..55105ac38f89 100644
--- a/drivers/tty/hvc/hvcs.c
+++ b/drivers/tty/hvc/hvcs.c
@@ -196,8 +196,6 @@ module_param(hvcs_parm_num_devs, int, 0);
 
 static const char hvcs_driver_name[] = "hvcs";
 static const char hvcs_device_node[] = "hvcs";
-static const char hvcs_driver_string[]
-	= "IBM hvcs (Hypervisor Virtual Console Server) Driver";
 
 /* Status of partner info rescan triggered via sysfs. */
 static int hvcs_rescan_status;
diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index 9d00ff5ef961..3703987c4666 100644
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -638,16 +638,15 @@ static int mxser_set_baud(struct tty_struct *tty, long newspd)
  * This routine is called to set the UART divisor registers to match
  * the specified baud rate for a serial port.
  */
-static int mxser_change_speed(struct tty_struct *tty)
+static void mxser_change_speed(struct tty_struct *tty)
 {
 	struct mxser_port *info = tty->driver_data;
 	unsigned cflag, cval, fcr;
-	int ret = 0;
 	unsigned char status;
 
 	cflag = tty->termios.c_cflag;
 	if (!info->ioaddr)
-		return ret;
+		return;
 
 	if (mxser_set_baud_method[tty->index] == 0)
 		mxser_set_baud(tty, tty_get_baud_rate(tty));
@@ -803,8 +802,6 @@ static int mxser_change_speed(struct tty_struct *tty)
 
 	outb(fcr, info->ioaddr + UART_FCR);	/* set fcr */
 	outb(cval, info->ioaddr + UART_LCR);
-
-	return ret;
 }
 
 static void mxser_check_modem_status(struct tty_struct *tty,
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index d77ed82a4840..0a29a94ec438 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -504,18 +504,7 @@ static void gsm_print_packet(const char *hdr, int addr, int cr,
 	else
 		pr_cont("(F)");
 
-	if (dlen) {
-		int ct = 0;
-		while (dlen--) {
-			if (ct % 8 == 0) {
-				pr_cont("\n");
-				pr_debug("    ");
-			}
-			pr_cont("%02X ", *data++);
-			ct++;
-		}
-	}
-	pr_cont("\n");
+	print_hex_dump_bytes("", DUMP_PREFIX_NONE, data, dlen);
 }
 
 
@@ -673,11 +662,10 @@ static struct gsm_msg *gsm_data_alloc(struct gsm_mux *gsm, u8 addr, int len,
  *	FIXME: lock against link layer control transmissions
  */
 
-static void gsm_data_kick(struct gsm_mux *gsm)
+static void gsm_data_kick(struct gsm_mux *gsm, struct gsm_dlci *dlci)
 {
 	struct gsm_msg *msg, *nmsg;
 	int len;
-	int skip_sof = 0;
 
 	list_for_each_entry_safe(msg, nmsg, &gsm->tx_list, list) {
 		if (gsm->constipated && msg->addr)
@@ -699,18 +687,23 @@ static void gsm_data_kick(struct gsm_mux *gsm)
 			print_hex_dump_bytes("gsm_data_kick: ",
 					     DUMP_PREFIX_OFFSET,
 					     gsm->txframe, len);
-
-		if (gsm->output(gsm, gsm->txframe + skip_sof,
-						len - skip_sof) < 0)
+		if (gsm->output(gsm, gsm->txframe, len) < 0)
 			break;
 		/* FIXME: Can eliminate one SOF in many more cases */
 		gsm->tx_bytes -= msg->len;
-		/* For a burst of frames skip the extra SOF within the
-		   burst */
-		skip_sof = 1;
 
 		list_del(&msg->list);
 		kfree(msg);
+
+		if (dlci) {
+			tty_port_tty_wakeup(&dlci->port);
+		} else {
+			int i = 0;
+
+			for (i = 0; i < NUM_DLCI; i++)
+				if (gsm->dlci[i])
+					tty_port_tty_wakeup(&gsm->dlci[i]->port);
+		}
 	}
 }
 
@@ -762,7 +755,7 @@ static void __gsm_data_queue(struct gsm_dlci *dlci, struct gsm_msg *msg)
 	/* Add to the actual output queue */
 	list_add_tail(&msg->list, &gsm->tx_list);
 	gsm->tx_bytes += msg->len;
-	gsm_data_kick(gsm);
+	gsm_data_kick(gsm, dlci);
 }
 
 /**
@@ -1223,7 +1216,7 @@ static void gsm_control_message(struct gsm_mux *gsm, unsigned int command,
 		gsm_control_reply(gsm, CMD_FCON, NULL, 0);
 		/* Kick the link in case it is idling */
 		spin_lock_irqsave(&gsm->tx_lock, flags);
-		gsm_data_kick(gsm);
+		gsm_data_kick(gsm, NULL);
 		spin_unlock_irqrestore(&gsm->tx_lock, flags);
 		break;
 	case CMD_FCOFF:
@@ -2545,7 +2538,7 @@ static void gsmld_write_wakeup(struct tty_struct *tty)
 	/* Queue poll */
 	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
 	spin_lock_irqsave(&gsm->tx_lock, flags);
-	gsm_data_kick(gsm);
+	gsm_data_kick(gsm, NULL);
 	if (gsm->tx_bytes < TX_THRESH_LO) {
 		gsm_dlci_data_sweep(gsm);
 	}
diff --git a/drivers/tty/rocket.c b/drivers/tty/rocket.c
index e2138e7d5dc6..2540b2e4c8e8 100644
--- a/drivers/tty/rocket.c
+++ b/drivers/tty/rocket.c
@@ -1885,7 +1885,7 @@ static int sPCIInitController(CONTROLLER_T * CtlP, int CtlNum,
  */
 static __init int register_PCI(int i, struct pci_dev *dev)
 {
-	int num_aiops, aiop, max_num_aiops, num_chan, chan;
+	int num_aiops, aiop, max_num_aiops, chan;
 	unsigned int aiopio[MAX_AIOPS_PER_BOARD];
 	CONTROLLER_t *ctlp;
 
@@ -2157,8 +2157,7 @@ static __init int register_PCI(int i, struct pci_dev *dev)
 	/*  Reset the AIOPIC, init the serial ports */
 	for (aiop = 0; aiop < num_aiops; aiop++) {
 		sResetAiopByNum(ctlp, aiop);
-		num_chan = ports_per_aiop;
-		for (chan = 0; chan < num_chan; chan++)
+		for (chan = 0; chan < ports_per_aiop; chan++)
 			init_r_port(i, aiop, chan, dev);
 	}
 
@@ -2166,11 +2165,10 @@ static __init int register_PCI(int i, struct pci_dev *dev)
 	if ((rcktpt_type[i] == ROCKET_TYPE_MODEM) ||
 	    (rcktpt_type[i] == ROCKET_TYPE_MODEMII) ||
 	    (rcktpt_type[i] == ROCKET_TYPE_MODEMIII)) {
-		num_chan = ports_per_aiop;
-		for (chan = 0; chan < num_chan; chan++)
+		for (chan = 0; chan < ports_per_aiop; chan++)
 			sPCIModemReset(ctlp, chan, 1);
 		msleep(500);
-		for (chan = 0; chan < num_chan; chan++)
+		for (chan = 0; chan < ports_per_aiop; chan++)
 			sPCIModemReset(ctlp, chan, 0);
 		msleep(500);
 		rmSpeakerReset(ctlp, rocketModel[i].model);
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 45d9117cab68..fc118f649887 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -1026,7 +1026,9 @@ int serial8250_register_8250_port(struct uart_8250_port *up)
 
 		if (up->port.dev) {
 			uart->port.dev = up->port.dev;
-			uart_get_rs485_mode(uart->port.dev, &uart->port.rs485);
+			ret = uart_get_rs485_mode(&uart->port);
+			if (ret)
+				goto err;
 		}
 
 		if (up->port.flags & UPF_FIXED_TYPE)
@@ -1040,7 +1042,7 @@ int serial8250_register_8250_port(struct uart_8250_port *up)
 			gpios = mctrl_gpio_init(&uart->port, 0);
 			if (IS_ERR(gpios)) {
 				ret = PTR_ERR(gpios);
-				goto out_unlock;
+				goto err;
 			} else {
 				uart->gpios = gpios;
 			}
@@ -1089,8 +1091,10 @@ int serial8250_register_8250_port(struct uart_8250_port *up)
 			serial8250_apply_quirks(uart);
 			ret = uart_add_one_port(&serial8250_reg,
 						&uart->port);
-			if (ret == 0)
-				ret = uart->port.line;
+			if (ret)
+				goto err;
+
+			ret = uart->port.line;
 		} else {
 			dev_info(uart->port.dev,
 				"skipping CIR port at 0x%lx / 0x%llx, IRQ %d\n",
@@ -1112,10 +1116,14 @@ int serial8250_register_8250_port(struct uart_8250_port *up)
 		}
 	}
 
-out_unlock:
 	mutex_unlock(&serial_mutex);
 
 	return ret;
+
+err:
+	uart->port.dev = NULL;
+	mutex_unlock(&serial_mutex);
+	return ret;
 }
 EXPORT_SYMBOL(serial8250_register_8250_port);
 
diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
index 59449b6500cd..ddb6aeb76dc5 100644
--- a/drivers/tty/serial/8250/8250_exar.c
+++ b/drivers/tty/serial/8250/8250_exar.c
@@ -25,13 +25,13 @@
 
 #include "8250.h"
 
-#define PCI_DEVICE_ID_ACCES_COM_2S		0x1052
-#define PCI_DEVICE_ID_ACCES_COM_4S		0x105d
-#define PCI_DEVICE_ID_ACCES_COM_8S		0x106c
-#define PCI_DEVICE_ID_ACCES_COM232_8		0x10a8
-#define PCI_DEVICE_ID_ACCES_COM_2SM		0x10d2
-#define PCI_DEVICE_ID_ACCES_COM_4SM		0x10db
-#define PCI_DEVICE_ID_ACCES_COM_8SM		0x10ea
+#define PCI_DEVICE_ID_ACCESSIO_COM_2S		0x1052
+#define PCI_DEVICE_ID_ACCESSIO_COM_4S		0x105d
+#define PCI_DEVICE_ID_ACCESSIO_COM_8S		0x106c
+#define PCI_DEVICE_ID_ACCESSIO_COM232_8		0x10a8
+#define PCI_DEVICE_ID_ACCESSIO_COM_2SM		0x10d2
+#define PCI_DEVICE_ID_ACCESSIO_COM_4SM		0x10db
+#define PCI_DEVICE_ID_ACCESSIO_COM_8SM		0x10ea
 
 #define PCI_DEVICE_ID_COMMTECH_4224PCI335	0x0002
 #define PCI_DEVICE_ID_COMMTECH_4222PCI335	0x0004
@@ -755,9 +755,7 @@ static const struct exar8250_board pbn_exar_XR17V8358 = {
 		(kernel_ulong_t)&bd					\
 	}
 
-#define EXAR_DEVICE(vend, devid, bd) {					\
-	PCI_VDEVICE(vend, PCI_DEVICE_ID_##devid), (kernel_ulong_t)&bd	\
-	}
+#define EXAR_DEVICE(vend, devid, bd) { PCI_DEVICE_DATA(vend, devid, &bd) }
 
 #define IBM_DEVICE(devid, sdevid, bd) {			\
 	PCI_DEVICE_SUB(					\
@@ -769,14 +767,13 @@ static const struct exar8250_board pbn_exar_XR17V8358 = {
 	}
 
 static const struct pci_device_id exar_pci_tbl[] = {
-	EXAR_DEVICE(ACCESSIO, ACCES_COM_2S, acces_com_2x),
-	EXAR_DEVICE(ACCESSIO, ACCES_COM_4S, acces_com_4x),
-	EXAR_DEVICE(ACCESSIO, ACCES_COM_8S, acces_com_8x),
-	EXAR_DEVICE(ACCESSIO, ACCES_COM232_8, acces_com_8x),
-	EXAR_DEVICE(ACCESSIO, ACCES_COM_2SM, acces_com_2x),
-	EXAR_DEVICE(ACCESSIO, ACCES_COM_4SM, acces_com_4x),
-	EXAR_DEVICE(ACCESSIO, ACCES_COM_8SM, acces_com_8x),
-
+	EXAR_DEVICE(ACCESSIO, COM_2S, acces_com_2x),
+	EXAR_DEVICE(ACCESSIO, COM_4S, acces_com_4x),
+	EXAR_DEVICE(ACCESSIO, COM_8S, acces_com_8x),
+	EXAR_DEVICE(ACCESSIO, COM232_8, acces_com_8x),
+	EXAR_DEVICE(ACCESSIO, COM_2SM, acces_com_2x),
+	EXAR_DEVICE(ACCESSIO, COM_4SM, acces_com_4x),
+	EXAR_DEVICE(ACCESSIO, COM_8SM, acces_com_8x),
 
 	CONNECT_DEVICE(XR17C152, UART_2_232, pbn_connect),
 	CONNECT_DEVICE(XR17C154, UART_4_232, pbn_connect),
@@ -794,24 +791,24 @@ static const struct pci_device_id exar_pci_tbl[] = {
 	IBM_DEVICE(XR17C152, SATURN_SERIAL_ONE_PORT, pbn_exar_ibm_saturn),
 
 	/* Exar Corp. XR17C15[248] Dual/Quad/Octal UART */
-	EXAR_DEVICE(EXAR, EXAR_XR17C152, pbn_exar_XR17C15x),
-	EXAR_DEVICE(EXAR, EXAR_XR17C154, pbn_exar_XR17C15x),
-	EXAR_DEVICE(EXAR, EXAR_XR17C158, pbn_exar_XR17C15x),
+	EXAR_DEVICE(EXAR, XR17C152, pbn_exar_XR17C15x),
+	EXAR_DEVICE(EXAR, XR17C154, pbn_exar_XR17C15x),
+	EXAR_DEVICE(EXAR, XR17C158, pbn_exar_XR17C15x),
 
 	/* Exar Corp. XR17V[48]35[248] Dual/Quad/Octal/Hexa PCIe UARTs */
-	EXAR_DEVICE(EXAR, EXAR_XR17V352, pbn_exar_XR17V35x),
-	EXAR_DEVICE(EXAR, EXAR_XR17V354, pbn_exar_XR17V35x),
-	EXAR_DEVICE(EXAR, EXAR_XR17V358, pbn_exar_XR17V35x),
-	EXAR_DEVICE(EXAR, EXAR_XR17V4358, pbn_exar_XR17V4358),
-	EXAR_DEVICE(EXAR, EXAR_XR17V8358, pbn_exar_XR17V8358),
-	EXAR_DEVICE(COMMTECH, COMMTECH_4222PCIE, pbn_exar_XR17V35x),
-	EXAR_DEVICE(COMMTECH, COMMTECH_4224PCIE, pbn_exar_XR17V35x),
-	EXAR_DEVICE(COMMTECH, COMMTECH_4228PCIE, pbn_exar_XR17V35x),
-
-	EXAR_DEVICE(COMMTECH, COMMTECH_4222PCI335, pbn_fastcom335_2),
-	EXAR_DEVICE(COMMTECH, COMMTECH_4224PCI335, pbn_fastcom335_4),
-	EXAR_DEVICE(COMMTECH, COMMTECH_2324PCI335, pbn_fastcom335_4),
-	EXAR_DEVICE(COMMTECH, COMMTECH_2328PCI335, pbn_fastcom335_8),
+	EXAR_DEVICE(EXAR, XR17V352, pbn_exar_XR17V35x),
+	EXAR_DEVICE(EXAR, XR17V354, pbn_exar_XR17V35x),
+	EXAR_DEVICE(EXAR, XR17V358, pbn_exar_XR17V35x),
+	EXAR_DEVICE(EXAR, XR17V4358, pbn_exar_XR17V4358),
+	EXAR_DEVICE(EXAR, XR17V8358, pbn_exar_XR17V8358),
+	EXAR_DEVICE(COMMTECH, 4222PCIE, pbn_exar_XR17V35x),
+	EXAR_DEVICE(COMMTECH, 4224PCIE, pbn_exar_XR17V35x),
+	EXAR_DEVICE(COMMTECH, 4228PCIE, pbn_exar_XR17V35x),
+
+	EXAR_DEVICE(COMMTECH, 4222PCI335, pbn_fastcom335_2),
+	EXAR_DEVICE(COMMTECH, 4224PCI335, pbn_fastcom335_4),
+	EXAR_DEVICE(COMMTECH, 2324PCI335, pbn_fastcom335_4),
+	EXAR_DEVICE(COMMTECH, 2328PCI335, pbn_fastcom335_8),
 	{ 0, }
 };
 MODULE_DEVICE_TABLE(pci, exar_pci_tbl);
diff --git a/drivers/tty/serial/8250/8250_fintek.c b/drivers/tty/serial/8250/8250_fintek.c
index 31c91c2f8c6e..d1d253c4b518 100644
--- a/drivers/tty/serial/8250/8250_fintek.c
+++ b/drivers/tty/serial/8250/8250_fintek.c
@@ -19,6 +19,7 @@
 #define CHIP_ID2  0x21
 #define CHIP_ID_F81865 0x0407
 #define CHIP_ID_F81866 0x1010
+#define CHIP_ID_F81966 0x0215
 #define CHIP_ID_F81216AD 0x1602
 #define CHIP_ID_F81216H 0x0501
 #define CHIP_ID_F81216 0x0802
@@ -62,9 +63,9 @@
 #define F81216_LDN_HIGH	0x4
 
 /*
- * F81866 registers
+ * F81866/966 registers
  *
- * The IRQ setting mode of F81866 is not the same with F81216 series.
+ * The IRQ setting mode of F81866/966 is not the same with F81216 series.
  *	Level/Low: IRQ_MODE0:0, IRQ_MODE1:0
  *	Edge/High: IRQ_MODE0:1, IRQ_MODE1:0
  *
@@ -155,6 +156,7 @@ static int fintek_8250_check_id(struct fintek_8250 *pdata)
 	switch (chip) {
 	case CHIP_ID_F81865:
 	case CHIP_ID_F81866:
+	case CHIP_ID_F81966:
 	case CHIP_ID_F81216AD:
 	case CHIP_ID_F81216H:
 	case CHIP_ID_F81216:
@@ -171,6 +173,7 @@ static int fintek_8250_get_ldn_range(struct fintek_8250 *pdata, int *min,
 				     int *max)
 {
 	switch (pdata->pid) {
+	case CHIP_ID_F81966:
 	case CHIP_ID_F81865:
 	case CHIP_ID_F81866:
 		*min = F81866_LDN_LOW;
@@ -248,6 +251,7 @@ static void fintek_8250_set_irq_mode(struct fintek_8250 *pdata, bool is_level)
 	sio_write_reg(pdata, LDN, pdata->index);
 
 	switch (pdata->pid) {
+	case CHIP_ID_F81966:
 	case CHIP_ID_F81866:
 		sio_write_mask_reg(pdata, F81866_FIFO_CTRL, F81866_IRQ_MODE1,
 				   0);
@@ -274,6 +278,7 @@ static void fintek_8250_set_max_fifo(struct fintek_8250 *pdata)
 {
 	switch (pdata->pid) {
 	case CHIP_ID_F81216H: /* 128Bytes FIFO */
+	case CHIP_ID_F81966:
 	case CHIP_ID_F81866:
 		sio_write_mask_reg(pdata, FIFO_CTRL,
 				   FIFO_MODE_MASK | RXFTHR_MODE_MASK,
@@ -291,6 +296,7 @@ static void fintek_8250_goto_highspeed(struct uart_8250_port *uart,
 	sio_write_reg(pdata, LDN, pdata->index);
 
 	switch (pdata->pid) {
+	case CHIP_ID_F81966:
 	case CHIP_ID_F81866: /* set uart clock for high speed serial mode */
 		sio_write_mask_reg(pdata, F81866_UART_CLK,
 			F81866_UART_CLK_MASK,
@@ -327,6 +333,7 @@ static void fintek_8250_set_termios(struct uart_port *port,
 	case CHIP_ID_F81216H:
 		reg = RS485;
 		break;
+	case CHIP_ID_F81966:
 	case CHIP_ID_F81866:
 		reg = F81866_UART_CLK;
 		break;
@@ -373,6 +380,7 @@ static void fintek_8250_set_termios_handler(struct uart_8250_port *uart)
 
 	switch (pdata->pid) {
 	case CHIP_ID_F81216H:
+	case CHIP_ID_F81966:
 	case CHIP_ID_F81866:
 		uart->port.set_termios = fintek_8250_set_termios;
 		break;
@@ -443,6 +451,7 @@ static void fintek_8250_set_rs485_handler(struct uart_8250_port *uart)
 	switch (pdata->pid) {
 	case CHIP_ID_F81216AD:
 	case CHIP_ID_F81216H:
+	case CHIP_ID_F81966:
 	case CHIP_ID_F81866:
 	case CHIP_ID_F81865:
 		uart->port.rs485_config = fintek_8250_rs485_config;
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index f77bf820b7a3..1632f7d25acc 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -681,6 +681,9 @@ int serial8250_em485_config(struct uart_port *port, struct serial_rs485 *rs485)
 	memset(rs485->padding, 0, sizeof(rs485->padding));
 	port->rs485 = *rs485;
 
+	gpiod_set_value(port->rs485_term_gpio,
+			rs485->flags & SER_RS485_TERMINATE_BUS);
+
 	/*
 	 * Both serial8250_em485_init() and serial8250_em485_destroy()
 	 * are idempotent.
@@ -1432,7 +1435,7 @@ static void serial8250_stop_rx(struct uart_port *port)
 
 /**
  * serial8250_em485_stop_tx() - generic ->rs485_stop_tx() callback
- * @up: uart 8250 port
+ * @p: uart 8250 port
  *
  * Generic callback usable by 8250 uart drivers to stop rs485 transmission.
  */
@@ -2615,6 +2618,8 @@ static unsigned int serial8250_get_baud_rate(struct uart_port *port,
 					     struct ktermios *termios,
 					     struct ktermios *old)
 {
+	unsigned int tolerance = port->uartclk / 100;
+
 	/*
 	 * Ask the core to calculate the divisor for us.
 	 * Allow 1% tolerance at the upper limit so uart clks marginally
@@ -2623,7 +2628,7 @@ static unsigned int serial8250_get_baud_rate(struct uart_port *port,
 	 */
 	return uart_get_baud_rate(port, termios, old,
 				  port->uartclk / 16 / UART_DIV_MAX,
-				  port->uartclk);
+				  (port->uartclk + tolerance) / 16);
 }
 
 void
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index af0688156dd0..8195a31519ea 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -63,6 +63,7 @@ config SERIAL_8250_PNP
 config SERIAL_8250_16550A_VARIANTS
 	bool "Support for variants of the 16550A serial port"
 	depends on SERIAL_8250
+	default !X86
 	help
 	  The 8250 driver can probe for many variants of the venerable 16550A
 	  serial port. Doing so takes additional time at boot.
diff --git a/drivers/tty/serial/8250/serial_cs.c b/drivers/tty/serial/8250/serial_cs.c
index c8186a05a453..e3d10794dbba 100644
--- a/drivers/tty/serial/8250/serial_cs.c
+++ b/drivers/tty/serial/8250/serial_cs.c
@@ -440,7 +440,7 @@ static int simple_config_check_notpicky(struct pcmcia_device *p_dev,
 static int simple_config(struct pcmcia_device *link)
 {
 	struct serial_info *info = link->priv;
-	int i = -ENODEV, try;
+	int ret, try;
 
 	/*
 	 * First pass: look for a config entry that looks normal.
@@ -472,8 +472,8 @@ found_port:
 	if (info->quirk && info->quirk->config)
 		info->quirk->config(link);
 
-	i = pcmcia_enable_device(link);
-	if (i != 0)
+	ret = pcmcia_enable_device(link);
+	if (ret != 0)
 		return -1;
 	return setup_serial(link, info, link->resource[0]->start, link->irq);
 }
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index adf9e80e7dc9..0282ad9cdaa7 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1034,13 +1034,22 @@ config SERIAL_SIFIVE_CONSOLE
 	  boot time.)
 
 config SERIAL_LANTIQ
-	bool "Lantiq serial driver"
-	depends on LANTIQ
+	tristate "Lantiq serial driver"
+	depends on (LANTIQ || X86) || COMPILE_TEST
 	select SERIAL_CORE
+	help
+	  Support for UART on Lantiq and Intel SoCs.
+	  To compile this driver as a module, select M here. The
+	  module will be called lantiq.
+
+config SERIAL_LANTIQ_CONSOLE
+	bool "Console on Lantiq UART"
+	depends on SERIAL_LANTIQ=y
 	select SERIAL_CORE_CONSOLE
 	select SERIAL_EARLYCON
 	help
-	  Support for console and UART on Lantiq SoCs.
+	  Select this option if you would like to use a Lantiq UART as the
+	  system console.
 
 config SERIAL_QE
 	tristate "Freescale QUICC Engine serial port support"
@@ -1462,6 +1471,7 @@ config SERIAL_STM32
 	tristate "STMicroelectronics STM32 serial port support"
 	select SERIAL_CORE
 	depends on ARCH_STM32 || COMPILE_TEST
+	select SERIAL_MCTRL_GPIO if GPIOLIB
 	help
 	  This driver is for the on-chip Serial Controller on
 	  STMicroelectronics STM32 MCUs.
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index c010f639298d..8efd7c2a34fe 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -2607,6 +2607,7 @@ static int pl011_setup_port(struct device *dev, struct uart_amba_port *uap,
 	uap->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_AMBA_PL011_CONSOLE);
 	uap->port.flags = UPF_BOOT_AUTOCONF;
 	uap->port.line = index;
+	spin_lock_init(&uap->port.lock);
 
 	amba_ports[index] = uap;
 
diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
index 7e7f1398019f..0c80a79d7442 100644
--- a/drivers/tty/serial/ar933x_uart.c
+++ b/drivers/tty/serial/ar933x_uart.c
@@ -766,8 +766,6 @@ static int ar933x_uart_probe(struct platform_device *pdev)
 		goto err_disable_clk;
 	}
 
-	uart_get_rs485_mode(&pdev->dev, &port->rs485);
-
 	port->mapbase = mem_res->start;
 	port->line = id;
 	port->irq = irq_res->start;
@@ -786,6 +784,10 @@ static int ar933x_uart_probe(struct platform_device *pdev)
 	baud = ar933x_uart_get_baud(port->uartclk, 0, AR933X_UART_MAX_STEP);
 	up->max_baud = min_t(unsigned int, baud, AR933X_UART_MAX_BAUD);
 
+	ret = uart_get_rs485_mode(port);
+	if (ret)
+		goto err_disable_clk;
+
 	up->gpios = mctrl_gpio_init(port, 0);
 	if (IS_ERR(up->gpios) && PTR_ERR(up->gpios) != -ENOSYS)
 		return PTR_ERR(up->gpios);
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 8d7080efad9b..e43471b33710 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -2491,8 +2491,6 @@ static int atmel_init_port(struct atmel_uart_port *atmel_port,
 	atmel_init_property(atmel_port, pdev);
 	atmel_set_ops(port);
 
-	uart_get_rs485_mode(&mpdev->dev, &port->rs485);
-
 	port->iotype		= UPIO_MEM;
 	port->flags		= UPF_BOOT_AUTOCONF | UPF_IOREMAP;
 	port->ops		= &atmel_pops;
@@ -2506,6 +2504,10 @@ static int atmel_init_port(struct atmel_uart_port *atmel_port,
 
 	memset(&atmel_port->rx_ring, 0, sizeof(atmel_port->rx_ring));
 
+	ret = uart_get_rs485_mode(port);
+	if (ret)
+		return ret;
+
 	/* for console, the clock could already be configured */
 	if (!atmel_port->clk) {
 		atmel_port->clk = clk_get(&mpdev->dev, "usart");
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 5d41075964f2..90298c403042 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1231,9 +1231,7 @@ static void lpuart_dma_rx_free(struct uart_port *port)
 					struct lpuart_port, port);
 	struct dma_chan *chan = sport->dma_rx_chan;
 
-	if (chan)
-		dmaengine_terminate_all(chan);
-
+	dmaengine_terminate_all(chan);
 	dma_unmap_sg(chan->device->dev, &sport->rx_sgl, 1, DMA_FROM_DEVICE);
 	kfree(sport->rx_ring.buf);
 	sport->rx_ring.tail = 0;
@@ -1514,17 +1512,17 @@ static void lpuart_request_dma(struct lpuart_port *sport)
 {
 	sport->dma_tx_chan = dma_request_chan(sport->port.dev, "tx");
 	if (IS_ERR(sport->dma_tx_chan)) {
-		dev_info_once(sport->port.dev,
-			      "DMA tx channel request failed, operating without tx DMA (%ld)\n",
-			      PTR_ERR(sport->dma_tx_chan));
+		dev_dbg_once(sport->port.dev,
+			     "DMA tx channel request failed, operating without tx DMA (%ld)\n",
+			     PTR_ERR(sport->dma_tx_chan));
 		sport->dma_tx_chan = NULL;
 	}
 
 	sport->dma_rx_chan = dma_request_chan(sport->port.dev, "rx");
 	if (IS_ERR(sport->dma_rx_chan)) {
-		dev_info_once(sport->port.dev,
-			      "DMA rx channel request failed, operating without rx DMA (%ld)\n",
-			      PTR_ERR(sport->dma_rx_chan));
+		dev_dbg_once(sport->port.dev,
+			     "DMA rx channel request failed, operating without rx DMA (%ld)\n",
+			     PTR_ERR(sport->dma_rx_chan));
 		sport->dma_rx_chan = NULL;
 	}
 }
@@ -2621,7 +2619,9 @@ static int lpuart_probe(struct platform_device *pdev)
 	if (ret)
 		goto failed_attach_port;
 
-	uart_get_rs485_mode(&pdev->dev, &sport->port.rs485);
+	ret = uart_get_rs485_mode(&sport->port);
+	if (ret)
+		goto failed_get_rs485;
 
 	if (sport->port.rs485.flags & SER_RS485_RX_DURING_TX)
 		dev_err(&pdev->dev, "driver doesn't support RX during TX\n");
@@ -2634,6 +2634,7 @@ static int lpuart_probe(struct platform_device *pdev)
 
 	return 0;
 
+failed_get_rs485:
 failed_attach_port:
 failed_irq_request:
 	lpuart_disable_clks(sport);
@@ -2664,8 +2665,7 @@ static int lpuart_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
-static int lpuart_suspend(struct device *dev)
+static int __maybe_unused lpuart_suspend(struct device *dev)
 {
 	struct lpuart_port *sport = dev_get_drvdata(dev);
 	unsigned long temp;
@@ -2723,7 +2723,7 @@ static int lpuart_suspend(struct device *dev)
 	return 0;
 }
 
-static int lpuart_resume(struct device *dev)
+static int __maybe_unused lpuart_resume(struct device *dev)
 {
 	struct lpuart_port *sport = dev_get_drvdata(dev);
 	bool irq_wake = irqd_is_wakeup_set(irq_get_irq_data(sport->port.irq));
@@ -2754,7 +2754,6 @@ static int lpuart_resume(struct device *dev)
 
 	return 0;
 }
-#endif
 
 static SIMPLE_DEV_PM_OPS(lpuart_pm_ops, lpuart_suspend, lpuart_resume);
 
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index f4d68109bc8b..1265e8d86d8a 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -909,6 +909,8 @@ static irqreturn_t imx_uart_int(int irq, void *dev_id)
 		usr2 &= ~USR2_ORE;
 
 	if (usr1 & (USR1_RRDY | USR1_AGTIM)) {
+		imx_uart_writel(sport, USR1_AGTIM, USR1);
+
 		__imx_uart_rxint(irq, dev_id);
 		ret = IRQ_HANDLED;
 	}
@@ -2252,6 +2254,8 @@ static int imx_uart_probe(struct platform_device *pdev)
 		return PTR_ERR(base);
 
 	rxirq = platform_get_irq(pdev, 0);
+	if (rxirq < 0)
+		return rxirq;
 	txirq = platform_get_irq_optional(pdev, 1);
 	rtsirq = platform_get_irq_optional(pdev, 2);
 
@@ -2302,7 +2306,11 @@ static int imx_uart_probe(struct platform_device *pdev)
 	sport->ucr4 = readl(sport->port.membase + UCR4);
 	sport->ufcr = readl(sport->port.membase + UFCR);
 
-	uart_get_rs485_mode(&pdev->dev, &sport->port.rs485);
+	ret = uart_get_rs485_mode(&sport->port);
+	if (ret) {
+		clk_disable_unprepare(sport->clk_ipg);
+		return ret;
+	}
 
 	if (sport->port.rs485.flags & SER_RS485_ENABLED &&
 	    (!sport->have_rtscts && !sport->have_rtsgpio))
@@ -2398,6 +2406,9 @@ static int imx_uart_probe(struct platform_device *pdev)
 		}
 	}
 
+	/* We need to initialize lock even for non-registered console */
+	spin_lock_init(&sport->port.lock);
+
 	imx_uart_ports[sport->port.line] = sport;
 
 	platform_set_drvdata(pdev, sport);
diff --git a/drivers/tty/serial/lantiq.c b/drivers/tty/serial/lantiq.c
index c5e46ff972e4..62813e421f12 100644
--- a/drivers/tty/serial/lantiq.c
+++ b/drivers/tty/serial/lantiq.c
@@ -15,6 +15,7 @@
 #include <linux/io.h>
 #include <linux/ioport.h>
 #include <linux/lantiq.h>
+#include <linux/module.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
@@ -597,6 +598,7 @@ static const struct uart_ops lqasc_pops = {
 	.verify_port =	lqasc_verify_port,
 };
 
+#ifdef CONFIG_SERIAL_LANTIQ_CONSOLE
 static void
 lqasc_console_putchar(struct uart_port *port, int ch)
 {
@@ -705,6 +707,14 @@ lqasc_serial_early_console_setup(struct earlycon_device *device,
 OF_EARLYCON_DECLARE(lantiq, "lantiq,asc", lqasc_serial_early_console_setup);
 OF_EARLYCON_DECLARE(lantiq, "intel,lgm-asc", lqasc_serial_early_console_setup);
 
+#define LANTIQ_SERIAL_CONSOLE	(&lqasc_console)
+
+#else
+
+#define LANTIQ_SERIAL_CONSOLE	NULL
+
+#endif /* CONFIG_SERIAL_LANTIQ_CONSOLE */
+
 static struct uart_driver lqasc_reg = {
 	.owner =	THIS_MODULE,
 	.driver_name =	DRVNAME,
@@ -712,7 +722,7 @@ static struct uart_driver lqasc_reg = {
 	.major =	0,
 	.minor =	0,
 	.nr =		MAXPORTS,
-	.cons =		&lqasc_console,
+	.cons =		LANTIQ_SERIAL_CONSOLE,
 };
 
 static int fetch_irq_lantiq(struct device *dev, struct ltq_uart_port *ltq_port)
@@ -814,8 +824,7 @@ static void free_irq_intel(struct uart_port *port)
 	free_irq(ltq_port->common_irq, port);
 }
 
-static int __init
-lqasc_probe(struct platform_device *pdev)
+static int lqasc_probe(struct platform_device *pdev)
 {
 	struct device_node *node = pdev->dev.of_node;
 	struct ltq_uart_port *ltq_port;
@@ -899,6 +908,13 @@ lqasc_probe(struct platform_device *pdev)
 	return ret;
 }
 
+static int lqasc_remove(struct platform_device *pdev)
+{
+	struct uart_port *port = platform_get_drvdata(pdev);
+
+	return uart_remove_one_port(&lqasc_reg, port);
+}
+
 static const struct ltq_soc_data soc_data_lantiq = {
 	.fetch_irq = fetch_irq_lantiq,
 	.request_irq = request_irq_lantiq,
@@ -916,8 +932,11 @@ static const struct of_device_id ltq_asc_match[] = {
 	{ .compatible = "intel,lgm-asc", .data = &soc_data_intel },
 	{},
 };
+MODULE_DEVICE_TABLE(of, ltq_asc_match);
 
 static struct platform_driver lqasc_driver = {
+	.probe		= lqasc_probe,
+	.remove		= lqasc_remove,
 	.driver		= {
 		.name	= DRVNAME,
 		.of_match_table = ltq_asc_match,
@@ -933,10 +952,21 @@ init_lqasc(void)
 	if (ret != 0)
 		return ret;
 
-	ret = platform_driver_probe(&lqasc_driver, lqasc_probe);
+	ret = platform_driver_register(&lqasc_driver);
 	if (ret != 0)
 		uart_unregister_driver(&lqasc_reg);
 
 	return ret;
 }
-device_initcall(init_lqasc);
+
+static void __exit exit_lqasc(void)
+{
+	platform_driver_unregister(&lqasc_driver);
+	uart_unregister_driver(&lqasc_reg);
+}
+
+module_init(init_lqasc);
+module_exit(exit_lqasc);
+
+MODULE_DESCRIPTION("Serial driver for Lantiq & Intel gateway SoCs");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/tty/serial/lpc32xx_hs.c b/drivers/tty/serial/lpc32xx_hs.c
index 9a836dcac157..b5898c932036 100644
--- a/drivers/tty/serial/lpc32xx_hs.c
+++ b/drivers/tty/serial/lpc32xx_hs.c
@@ -23,7 +23,6 @@
 #include <linux/nmi.h>
 #include <linux/io.h>
 #include <linux/irq.h>
-#include <linux/gpio.h>
 #include <linux/of.h>
 #include <linux/sizes.h>
 #include <linux/soc/nxp/lpc32xx-misc.h>
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index f7d6b3c9ea45..8573fc9cb0cd 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -33,8 +33,7 @@
 #include <linux/pm_wakeirq.h>
 #include <linux/of.h>
 #include <linux/of_irq.h>
-#include <linux/gpio.h>
-#include <linux/of_gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/platform_data/serial-omap.h>
 
 #define OMAP_MAX_HSUART_PORTS	10
@@ -153,7 +152,7 @@ struct uart_omap_port {
 	u32			errata;
 	u32			features;
 
-	int			rts_gpio;
+	struct gpio_desc	*rts_gpiod;
 
 	struct pm_qos_request	pm_qos_request;
 	u32			latency;
@@ -303,11 +302,11 @@ static void serial_omap_stop_tx(struct uart_port *port)
 			serial_out(up, UART_OMAP_SCR, up->scr);
 			res = (port->rs485.flags & SER_RS485_RTS_AFTER_SEND) ?
 				1 : 0;
-			if (gpio_get_value(up->rts_gpio) != res) {
+			if (gpiod_get_value(up->rts_gpiod) != res) {
 				if (port->rs485.delay_rts_after_send > 0)
 					mdelay(
 					port->rs485.delay_rts_after_send);
-				gpio_set_value(up->rts_gpio, res);
+				gpiod_set_value(up->rts_gpiod, res);
 			}
 		} else {
 			/* We're asked to stop, but there's still stuff in the
@@ -412,8 +411,8 @@ static void serial_omap_start_tx(struct uart_port *port)
 
 		/* if rts not already enabled */
 		res = (port->rs485.flags & SER_RS485_RTS_ON_SEND) ? 1 : 0;
-		if (gpio_get_value(up->rts_gpio) != res) {
-			gpio_set_value(up->rts_gpio, res);
+		if (gpiod_get_value(up->rts_gpiod) != res) {
+			gpiod_set_value(up->rts_gpiod, res);
 			if (port->rs485.delay_rts_before_send > 0)
 				mdelay(port->rs485.delay_rts_before_send);
 		}
@@ -1414,12 +1413,12 @@ serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485)
 	 * Just as a precaution, only allow rs485
 	 * to be enabled if the gpio pin is valid
 	 */
-	if (gpio_is_valid(up->rts_gpio)) {
+	if (up->rts_gpiod) {
 		/* enable / disable rts */
 		val = (port->rs485.flags & SER_RS485_ENABLED) ?
 			SER_RS485_RTS_AFTER_SEND : SER_RS485_RTS_ON_SEND;
 		val = (port->rs485.flags & val) ? 1 : 0;
-		gpio_set_value(up->rts_gpio, val);
+		gpiod_set_value(up->rts_gpiod, val);
 	} else
 		port->rs485.flags &= ~SER_RS485_ENABLED;
 
@@ -1596,18 +1595,22 @@ static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev)
 }
 
 static int serial_omap_probe_rs485(struct uart_omap_port *up,
-				   struct device_node *np)
+				   struct device *dev)
 {
 	struct serial_rs485 *rs485conf = &up->port.rs485;
+	struct device_node *np = dev->of_node;
+	enum gpiod_flags gflags;
 	int ret;
 
 	rs485conf->flags = 0;
-	up->rts_gpio = -EINVAL;
+	up->rts_gpiod = NULL;
 
 	if (!np)
 		return 0;
 
-	uart_get_rs485_mode(up->dev, rs485conf);
+	ret = uart_get_rs485_mode(&up->port);
+	if (ret)
+		return ret;
 
 	if (of_property_read_bool(np, "rs485-rts-active-high")) {
 		rs485conf->flags |= SER_RS485_RTS_ON_SEND;
@@ -1618,19 +1621,20 @@ static int serial_omap_probe_rs485(struct uart_omap_port *up,
 	}
 
 	/* check for tx enable gpio */
-	up->rts_gpio = of_get_named_gpio(np, "rts-gpio", 0);
-	if (gpio_is_valid(up->rts_gpio)) {
-		ret = devm_gpio_request(up->dev, up->rts_gpio, "omap-serial");
-		if (ret < 0)
-			return ret;
-		ret = rs485conf->flags & SER_RS485_RTS_AFTER_SEND ? 1 : 0;
-		ret = gpio_direction_output(up->rts_gpio, ret);
-		if (ret < 0)
+	gflags = rs485conf->flags & SER_RS485_RTS_AFTER_SEND ?
+		GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
+	up->rts_gpiod = devm_gpiod_get_optional(dev, "rts", gflags);
+	if (IS_ERR(up->rts_gpiod)) {
+		ret = PTR_ERR(up->rts_gpiod);
+	        if (ret == -EPROBE_DEFER)
 			return ret;
-	} else if (up->rts_gpio == -EPROBE_DEFER) {
-		return -EPROBE_DEFER;
+		/*
+		 * FIXME: the code historically ignored any other error than
+		 * -EPROBE_DEFER and just went on without GPIO.
+		 */
+		up->rts_gpiod = NULL;
 	} else {
-		up->rts_gpio = -EINVAL;
+		gpiod_set_consumer_name(up->rts_gpiod, "omap-serial");
 	}
 
 	return 0;
@@ -1703,7 +1707,7 @@ static int serial_omap_probe(struct platform_device *pdev)
 		dev_info(up->port.dev, "no wakeirq for uart%d\n",
 			 up->port.line);
 
-	ret = serial_omap_probe_rs485(up, pdev->dev.of_node);
+	ret = serial_omap_probe_rs485(up, &pdev->dev);
 	if (ret < 0)
 		goto err_rs485;
 
diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 6bace1c6bb09..457c0bf8cbf8 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -141,9 +141,10 @@ static void qcom_geni_serial_stop_rx(struct uart_port *uport);
 static void qcom_geni_serial_handle_rx(struct uart_port *uport, bool drop);
 
 static const unsigned long root_freq[] = {7372800, 14745600, 19200000, 29491200,
-					32000000, 48000000, 64000000, 80000000,
-					96000000, 100000000, 102400000,
-					112000000, 120000000, 128000000};
+					32000000, 48000000, 51200000, 64000000,
+					80000000, 96000000, 100000000,
+					102400000, 112000000, 120000000,
+					128000000};
 
 #define to_dev_port(ptr, member) \
 		container_of(ptr, struct qcom_geni_serial_port, member)
diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index 73f951d65b93..d913d9b2762a 100644
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -154,10 +154,33 @@ struct s3c24xx_uart_port {
 #define portaddrl(port, reg) \
 	((unsigned long *)(unsigned long)((port)->membase + (reg)))
 
-#define rd_regb(port, reg) (readb_relaxed(portaddr(port, reg)))
+static u32 rd_reg(struct uart_port *port, u32 reg)
+{
+	switch (port->iotype) {
+	case UPIO_MEM:
+		return readb_relaxed(portaddr(port, reg));
+	case UPIO_MEM32:
+		return readl_relaxed(portaddr(port, reg));
+	default:
+		return 0;
+	}
+	return 0;
+}
+
 #define rd_regl(port, reg) (readl_relaxed(portaddr(port, reg)))
 
-#define wr_regb(port, reg, val) writeb_relaxed(val, portaddr(port, reg))
+static void wr_reg(struct uart_port *port, u32 reg, u32 val)
+{
+	switch (port->iotype) {
+	case UPIO_MEM:
+		writeb_relaxed(val, portaddr(port, reg));
+		break;
+	case UPIO_MEM32:
+		writel_relaxed(val, portaddr(port, reg));
+		break;
+	}
+}
+
 #define wr_regl(port, reg, val) writel_relaxed(val, portaddr(port, reg))
 
 /* Byte-order aware bit setting/clearing functions. */
@@ -714,7 +737,7 @@ static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport)
 		fifocnt--;
 
 		uerstat = rd_regl(port, S3C2410_UERSTAT);
-		ch = rd_regb(port, S3C2410_URXH);
+		ch = rd_reg(port, S3C2410_URXH);
 
 		if (port->flags & UPF_CONS_FLOW) {
 			int txe = s3c24xx_serial_txempty_nofifo(port);
@@ -826,7 +849,7 @@ static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
 	}
 
 	if (port->x_char) {
-		wr_regb(port, S3C2410_UTXH, port->x_char);
+		wr_reg(port, S3C2410_UTXH, port->x_char);
 		port->icount.tx++;
 		port->x_char = 0;
 		goto out;
@@ -852,7 +875,7 @@ static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
 		if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
 			break;
 
-		wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
+		wr_reg(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
 		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 		port->icount.tx++;
 		count--;
@@ -916,7 +939,7 @@ static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
 /* no modem control lines */
 static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
 {
-	unsigned int umstat = rd_regb(port, S3C2410_UMSTAT);
+	unsigned int umstat = rd_reg(port, S3C2410_UMSTAT);
 
 	if (umstat & S3C2410_UMSTAT_CTS)
 		return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
@@ -1281,14 +1304,14 @@ static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport,
 	struct s3c24xx_uart_info *info = ourport->info;
 	struct clk *clk;
 	unsigned long rate;
-	unsigned int cnt, baud, quot, clk_sel, best_quot = 0;
+	unsigned int cnt, baud, quot, best_quot = 0;
 	char clkname[MAX_CLK_NAME_LENGTH];
 	int calc_deviation, deviation = (1 << 30) - 1;
 
-	clk_sel = (ourport->cfg->clk_sel) ? ourport->cfg->clk_sel :
-			ourport->info->def_clk_sel;
 	for (cnt = 0; cnt < info->num_clks; cnt++) {
-		if (!(clk_sel & (1 << cnt)))
+		/* Keep selected clock if provided */
+		if (ourport->cfg->clk_sel &&
+			!(ourport->cfg->clk_sel & (1 << cnt)))
 			continue;
 
 		sprintf(clkname, "clk_uart_baud%d", cnt);
@@ -1974,7 +1997,7 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
 	struct device_node *np = pdev->dev.of_node;
 	struct s3c24xx_uart_port *ourport;
 	int index = probe_index;
-	int ret;
+	int ret, prop = 0;
 
 	if (np) {
 		ret = of_alias_get_id(np, "serial");
@@ -2000,10 +2023,27 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
 			dev_get_platdata(&pdev->dev) :
 			ourport->drv_data->def_cfg;
 
-	if (np)
+	if (np) {
 		of_property_read_u32(np,
 			"samsung,uart-fifosize", &ourport->port.fifosize);
 
+		if (of_property_read_u32(np, "reg-io-width", &prop) == 0) {
+			switch (prop) {
+			case 1:
+				ourport->port.iotype = UPIO_MEM;
+				break;
+			case 4:
+				ourport->port.iotype = UPIO_MEM32;
+				break;
+			default:
+				dev_warn(&pdev->dev, "unsupported reg-io-width (%d)\n",
+						prop);
+				ret = -EINVAL;
+				break;
+			}
+		}
+	}
+
 	if (ourport->drv_data->fifosize[index])
 		ourport->port.fifosize = ourport->drv_data->fifosize[index];
 	else if (ourport->info->fifosize)
@@ -2185,7 +2225,7 @@ static int s3c24xx_serial_get_poll_char(struct uart_port *port)
 	if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
 		return NO_POLL_CHAR;
 
-	return rd_regb(port, S3C2410_URXH);
+	return rd_reg(port, S3C2410_URXH);
 }
 
 static void s3c24xx_serial_put_poll_char(struct uart_port *port,
@@ -2200,7 +2240,7 @@ static void s3c24xx_serial_put_poll_char(struct uart_port *port,
 
 	while (!s3c24xx_serial_console_txrdy(port, ufcon))
 		cpu_relax();
-	wr_regb(port, S3C2410_UTXH, c);
+	wr_reg(port, S3C2410_UTXH, c);
 }
 
 #endif /* CONFIG_CONSOLE_POLL */
@@ -2212,7 +2252,7 @@ s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
 
 	while (!s3c24xx_serial_console_txrdy(port, ufcon))
 		cpu_relax();
-	wr_regb(port, S3C2410_UTXH, ch);
+	wr_reg(port, S3C2410_UTXH, ch);
 }
 
 static void
@@ -2587,6 +2627,18 @@ module_platform_driver(samsung_serial_driver);
  * Early console.
  */
 
+static void wr_reg_barrier(struct uart_port *port, u32 reg, u32 val)
+{
+	switch (port->iotype) {
+	case UPIO_MEM:
+		writeb(val, portaddr(port, reg));
+		break;
+	case UPIO_MEM32:
+		writel(val, portaddr(port, reg));
+		break;
+	}
+}
+
 struct samsung_early_console_data {
 	u32 txfull_mask;
 };
@@ -2612,7 +2664,7 @@ static void samsung_early_putc(struct uart_port *port, int c)
 	else
 		samsung_early_busyuart(port);
 
-	writeb(c, port->membase + S3C2410_UTXH);
+	wr_reg_barrier(port, S3C2410_UTXH, c);
 }
 
 static void samsung_early_write(struct console *con, const char *s,
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 06e8071d5601..d2e5c6c86643 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -315,6 +315,7 @@ struct sc16is7xx_one {
 	struct kthread_work		tx_work;
 	struct kthread_work		reg_work;
 	struct sc16is7xx_one_config	config;
+	bool				irda_mode;
 };
 
 struct sc16is7xx_port {
@@ -327,7 +328,6 @@ struct sc16is7xx_port {
 	unsigned char			buf[SC16IS7XX_FIFO_SIZE];
 	struct kthread_worker		kworker;
 	struct task_struct		*kworker_task;
-	struct kthread_work		irq_work;
 	struct mutex			efr_lock;
 	struct sc16is7xx_one		p[];
 };
@@ -710,9 +710,9 @@ static bool sc16is7xx_port_irq(struct sc16is7xx_port *s, int portno)
 	return true;
 }
 
-static void sc16is7xx_ist(struct kthread_work *ws)
+static irqreturn_t sc16is7xx_irq(int irq, void *dev_id)
 {
-	struct sc16is7xx_port *s = to_sc16is7xx_port(ws, irq_work);
+	struct sc16is7xx_port *s = (struct sc16is7xx_port *)dev_id;
 
 	mutex_lock(&s->efr_lock);
 
@@ -727,13 +727,6 @@ static void sc16is7xx_ist(struct kthread_work *ws)
 	}
 
 	mutex_unlock(&s->efr_lock);
-}
-
-static irqreturn_t sc16is7xx_irq(int irq, void *dev_id)
-{
-	struct sc16is7xx_port *s = (struct sc16is7xx_port *)dev_id;
-
-	kthread_queue_work(&s->kworker, &s->irq_work);
 
 	return IRQ_HANDLED;
 }
@@ -994,6 +987,7 @@ static int sc16is7xx_config_rs485(struct uart_port *port,
 
 static int sc16is7xx_startup(struct uart_port *port)
 {
+	struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
 	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
 	unsigned int val;
 
@@ -1032,6 +1026,13 @@ static int sc16is7xx_startup(struct uart_port *port)
 	/* Now, initialize the UART */
 	sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, SC16IS7XX_LCR_WORD_LEN_8);
 
+	/* Enable IrDA mode if requested in DT */
+	/* This bit must be written with LCR[7] = 0 */
+	sc16is7xx_port_update(port, SC16IS7XX_MCR_REG,
+			      SC16IS7XX_MCR_IRDA_BIT,
+			      one->irda_mode ?
+				SC16IS7XX_MCR_IRDA_BIT : 0);
+
 	/* Enable the Rx and Tx FIFO */
 	sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG,
 			      SC16IS7XX_EFCR_RXDISABLE_BIT |
@@ -1176,10 +1177,11 @@ static int sc16is7xx_gpio_direction_output(struct gpio_chip *chip,
 
 static int sc16is7xx_probe(struct device *dev,
 			   const struct sc16is7xx_devtype *devtype,
-			   struct regmap *regmap, int irq, unsigned long flags)
+			   struct regmap *regmap, int irq)
 {
 	struct sched_param sched_param = { .sched_priority = MAX_RT_PRIO / 2 };
 	unsigned long freq = 0, *pfreq = dev_get_platdata(dev);
+	unsigned int val;
 	u32 uartclk = 0;
 	int i, ret;
 	struct sc16is7xx_port *s;
@@ -1187,6 +1189,16 @@ static int sc16is7xx_probe(struct device *dev,
 	if (IS_ERR(regmap))
 		return PTR_ERR(regmap);
 
+	/*
+	 * This device does not have an identification register that would
+	 * tell us if we are really connected to the correct device.
+	 * The best we can do is to check if communication is at all possible.
+	 */
+	ret = regmap_read(regmap,
+			  SC16IS7XX_LSR_REG << SC16IS7XX_REG_SHIFT, &val);
+	if (ret < 0)
+		return ret;
+
 	/* Alloc port structure */
 	s = devm_kzalloc(dev, struct_size(s, p, devtype->nr_uart), GFP_KERNEL);
 	if (!s) {
@@ -1221,7 +1233,6 @@ static int sc16is7xx_probe(struct device *dev,
 	mutex_init(&s->efr_lock);
 
 	kthread_init_worker(&s->kworker);
-	kthread_init_work(&s->irq_work, sc16is7xx_ist);
 	s->kworker_task = kthread_run(kthread_worker_fn, &s->kworker,
 				      "sc16is7xx");
 	if (IS_ERR(s->kworker_task)) {
@@ -1302,9 +1313,33 @@ static int sc16is7xx_probe(struct device *dev,
 		sc16is7xx_power(&s->p[i].port, 0);
 	}
 
-	/* Setup interrupt */
-	ret = devm_request_irq(dev, irq, sc16is7xx_irq,
-			       flags, dev_name(dev), s);
+	if (dev->of_node) {
+		struct property *prop;
+		const __be32 *p;
+		u32 u;
+
+		of_property_for_each_u32(dev->of_node, "irda-mode-ports",
+					 prop, p, u)
+			if (u < devtype->nr_uart)
+				s->p[u].irda_mode = true;
+	}
+
+	/*
+	 * Setup interrupt. We first try to acquire the IRQ line as level IRQ.
+	 * If that succeeds, we can allow sharing the interrupt as well.
+	 * In case the interrupt controller doesn't support that, we fall
+	 * back to a non-shared falling-edge trigger.
+	 */
+	ret = devm_request_threaded_irq(dev, irq, NULL, sc16is7xx_irq,
+					IRQF_TRIGGER_LOW | IRQF_SHARED |
+					IRQF_ONESHOT,
+					dev_name(dev), s);
+	if (!ret)
+		return 0;
+
+	ret = devm_request_threaded_irq(dev, irq, NULL, sc16is7xx_irq,
+					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+					dev_name(dev), s);
 	if (!ret)
 		return 0;
 
@@ -1378,7 +1413,6 @@ static struct regmap_config regcfg = {
 static int sc16is7xx_spi_probe(struct spi_device *spi)
 {
 	const struct sc16is7xx_devtype *devtype;
-	unsigned long flags = 0;
 	struct regmap *regmap;
 	int ret;
 
@@ -1399,14 +1433,13 @@ static int sc16is7xx_spi_probe(struct spi_device *spi)
 		const struct spi_device_id *id_entry = spi_get_device_id(spi);
 
 		devtype = (struct sc16is7xx_devtype *)id_entry->driver_data;
-		flags = IRQF_TRIGGER_FALLING;
 	}
 
 	regcfg.max_register = (0xf << SC16IS7XX_REG_SHIFT) |
 			      (devtype->nr_uart - 1);
 	regmap = devm_regmap_init_spi(spi, &regcfg);
 
-	return sc16is7xx_probe(&spi->dev, devtype, regmap, spi->irq, flags);
+	return sc16is7xx_probe(&spi->dev, devtype, regmap, spi->irq);
 }
 
 static int sc16is7xx_spi_remove(struct spi_device *spi)
@@ -1445,7 +1478,6 @@ static int sc16is7xx_i2c_probe(struct i2c_client *i2c,
 			       const struct i2c_device_id *id)
 {
 	const struct sc16is7xx_devtype *devtype;
-	unsigned long flags = 0;
 	struct regmap *regmap;
 
 	if (i2c->dev.of_node) {
@@ -1454,14 +1486,13 @@ static int sc16is7xx_i2c_probe(struct i2c_client *i2c,
 			return -ENODEV;
 	} else {
 		devtype = (struct sc16is7xx_devtype *)id->driver_data;
-		flags = IRQF_TRIGGER_FALLING;
 	}
 
 	regcfg.max_register = (0xf << SC16IS7XX_REG_SHIFT) |
 			      (devtype->nr_uart - 1);
 	regmap = devm_regmap_init_i2c(i2c, &regcfg);
 
-	return sc16is7xx_probe(&i2c->dev, devtype, regmap, i2c->irq, flags);
+	return sc16is7xx_probe(&i2c->dev, devtype, regmap, i2c->irq);
 }
 
 static int sc16is7xx_i2c_remove(struct i2c_client *client)
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 66a5e2faf57e..57840cf90388 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -3295,8 +3295,10 @@ EXPORT_SYMBOL(uart_remove_one_port);
  * This function implements the device tree binding described in
  * Documentation/devicetree/bindings/serial/rs485.txt.
  */
-void uart_get_rs485_mode(struct device *dev, struct serial_rs485 *rs485conf)
+int uart_get_rs485_mode(struct uart_port *port)
 {
+	struct serial_rs485 *rs485conf = &port->rs485;
+	struct device *dev = port->dev;
 	u32 rs485_delay[2];
 	int ret;
 
@@ -3315,6 +3317,7 @@ void uart_get_rs485_mode(struct device *dev, struct serial_rs485 *rs485conf)
 	 * to get to a defined state with the following properties:
 	 */
 	rs485conf->flags &= ~(SER_RS485_RX_DURING_TX | SER_RS485_ENABLED |
+			      SER_RS485_TERMINATE_BUS |
 			      SER_RS485_RTS_AFTER_SEND);
 	rs485conf->flags |= SER_RS485_RTS_ON_SEND;
 
@@ -3328,6 +3331,23 @@ void uart_get_rs485_mode(struct device *dev, struct serial_rs485 *rs485conf)
 		rs485conf->flags &= ~SER_RS485_RTS_ON_SEND;
 		rs485conf->flags |= SER_RS485_RTS_AFTER_SEND;
 	}
+
+	/*
+	 * Disabling termination by default is the safe choice:  Else if many
+	 * bus participants enable it, no communication is possible at all.
+	 * Works fine for short cables and users may enable for longer cables.
+	 */
+	port->rs485_term_gpio = devm_gpiod_get_optional(dev, "rs485-term",
+							GPIOD_OUT_LOW);
+	if (IS_ERR(port->rs485_term_gpio)) {
+		ret = PTR_ERR(port->rs485_term_gpio);
+		port->rs485_term_gpio = NULL;
+		if (ret != -EPROBE_DEFER)
+			dev_err(dev, "Cannot get rs485-term-gpios\n");
+		return ret;
+	}
+
+	return 0;
 }
 EXPORT_SYMBOL_GPL(uart_get_rs485_mode);
 
diff --git a/drivers/tty/serial/sh-sci.h b/drivers/tty/serial/sh-sci.h
index 0b9e804e61a9..c0dfe4382898 100644
--- a/drivers/tty/serial/sh-sci.h
+++ b/drivers/tty/serial/sh-sci.h
@@ -2,7 +2,6 @@
 #include <linux/bitops.h>
 #include <linux/serial_core.h>
 #include <linux/io.h>
-#include <linux/gpio.h>
 
 #define SCI_MAJOR		204
 #define SCI_MINOR_START		8
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 5e93e8d40f59..8602ff357321 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -31,6 +31,7 @@
 #include <linux/tty_flip.h>
 #include <linux/tty.h>
 
+#include "serial_mctrl_gpio.h"
 #include "stm32-usart.h"
 
 static void stm32_stop_tx(struct uart_port *port);
@@ -158,9 +159,7 @@ static int stm32_init_rs485(struct uart_port *port,
 	if (!pdev->dev.of_node)
 		return -ENODEV;
 
-	uart_get_rs485_mode(&pdev->dev, rs485conf);
-
-	return 0;
+	return uart_get_rs485_mode(port);
 }
 
 static int stm32_pending_rx(struct uart_port *port, u32 *sr, int *last_res,
@@ -510,12 +509,29 @@ static void stm32_set_mctrl(struct uart_port *port, unsigned int mctrl)
 		stm32_set_bits(port, ofs->cr3, USART_CR3_RTSE);
 	else
 		stm32_clr_bits(port, ofs->cr3, USART_CR3_RTSE);
+
+	mctrl_gpio_set(stm32_port->gpios, mctrl);
 }
 
 static unsigned int stm32_get_mctrl(struct uart_port *port)
 {
+	struct stm32_port *stm32_port = to_stm32_port(port);
+	unsigned int ret;
+
 	/* This routine is used to get signals of: DCD, DSR, RI, and CTS */
-	return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
+	ret = TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
+
+	return mctrl_gpio_get(stm32_port->gpios, &ret);
+}
+
+static void stm32_enable_ms(struct uart_port *port)
+{
+	mctrl_gpio_enable_ms(to_stm32_port(port)->gpios);
+}
+
+static void stm32_disable_ms(struct uart_port *port)
+{
+	mctrl_gpio_disable_ms(to_stm32_port(port)->gpios);
 }
 
 /* Transmit stop */
@@ -626,6 +642,9 @@ static void stm32_shutdown(struct uart_port *port)
 	u32 val, isr;
 	int ret;
 
+	/* Disable modem control interrupts */
+	stm32_disable_ms(port);
+
 	val = USART_CR1_TXEIE | USART_CR1_TE;
 	val |= stm32_port->cr1_irq | USART_CR1_RE;
 	val |= BIT(cfg->uart_enable_bit);
@@ -764,6 +783,12 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
 		cr3 |= USART_CR3_CTSE | USART_CR3_RTSE;
 	}
 
+	/* Handle modem control interrupts */
+	if (UART_ENABLE_MS(port, termios->c_cflag))
+		stm32_enable_ms(port);
+	else
+		stm32_disable_ms(port);
+
 	usartdiv = DIV_ROUND_CLOSEST(port->uartclk, baud);
 
 	/*
@@ -898,6 +923,7 @@ static const struct uart_ops stm32_uart_ops = {
 	.throttle	= stm32_throttle,
 	.unthrottle	= stm32_unthrottle,
 	.stop_rx	= stm32_stop_rx,
+	.enable_ms	= stm32_enable_ms,
 	.break_ctl	= stm32_break_ctl,
 	.startup	= stm32_startup,
 	.shutdown	= stm32_shutdown,
@@ -931,7 +957,9 @@ static int stm32_init_port(struct stm32_port *stm32port,
 
 	port->rs485_config = stm32_config_rs485;
 
-	stm32_init_rs485(port, pdev);
+	ret = stm32_init_rs485(port, pdev);
+	if (ret)
+		return ret;
 
 	if (stm32port->info->cfg.has_wakeup) {
 		stm32port->wakeirq = platform_get_irq(pdev, 1);
@@ -960,11 +988,32 @@ static int stm32_init_port(struct stm32_port *stm32port,
 
 	stm32port->port.uartclk = clk_get_rate(stm32port->clk);
 	if (!stm32port->port.uartclk) {
-		clk_disable_unprepare(stm32port->clk);
 		ret = -EINVAL;
+		goto err_clk;
+	}
+
+	stm32port->gpios = mctrl_gpio_init(&stm32port->port, 0);
+	if (IS_ERR(stm32port->gpios)) {
+		ret = PTR_ERR(stm32port->gpios);
+		goto err_clk;
+	}
+
+	/* Both CTS/RTS gpios and "st,hw-flow-ctrl" should not be specified */
+	if (stm32port->hw_flow_control) {
+		if (mctrl_gpio_to_gpiod(stm32port->gpios, UART_GPIO_CTS) ||
+		    mctrl_gpio_to_gpiod(stm32port->gpios, UART_GPIO_RTS)) {
+			dev_err(&pdev->dev, "Conflicting RTS/CTS config\n");
+			ret = -EINVAL;
+			goto err_clk;
+		}
 	}
 
 	return ret;
+
+err_clk:
+	clk_disable_unprepare(stm32port->clk);
+
+	return ret;
 }
 
 static struct stm32_port *stm32_of_get_stm32_port(struct platform_device *pdev)
@@ -1375,7 +1424,18 @@ static int __maybe_unused stm32_serial_suspend(struct device *dev)
 	else
 		stm32_serial_enable_wakeup(port, false);
 
-	pinctrl_pm_select_sleep_state(dev);
+	/*
+	 * When "no_console_suspend" is enabled, keep the pinctrl default state
+	 * and rely on bootloader stage to restore this state upon resume.
+	 * Otherwise, apply the idle or sleep states depending on wakeup
+	 * capabilities.
+	 */
+	if (console_suspend_enabled || !uart_console(port)) {
+		if (device_may_wakeup(dev))
+			pinctrl_pm_select_idle_state(dev);
+		else
+			pinctrl_pm_select_sleep_state(dev);
+	}
 
 	return 0;
 }
diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h
index db8bf0d4982d..d4c916e78d40 100644
--- a/drivers/tty/serial/stm32-usart.h
+++ b/drivers/tty/serial/stm32-usart.h
@@ -274,6 +274,7 @@ struct stm32_port {
 	bool fifoen;
 	int wakeirq;
 	int rdr_mask;		/* receive data register mask */
+	struct mctrl_gpios *gpios; /* modem control gpios */
 };
 
 static struct stm32_port stm32_ports[STM32_MAX_PORTS];
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 35e9e8faf8de..b9d672af8b65 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -1235,9 +1235,7 @@ static void cdns_uart_console_write(struct console *co, const char *s,
 	writel(ctrl, port->membase + CDNS_UART_CR);
 
 	uart_console_write(port, s, count, cdns_uart_console_putchar);
-	while ((readl(port->membase + CDNS_UART_SR) &
-			(CDNS_UART_SR_TXEMPTY | CDNS_UART_SR_TACTIVE)) !=
-			CDNS_UART_SR_TXEMPTY)
+	while (cdns_uart_tx_empty(port) != TIOCSER_TEMT)
 		cpu_relax();
 
 	/* restore interrupt state */
@@ -1262,6 +1260,7 @@ static int cdns_uart_console_setup(struct console *co, char *options)
 	int bits = 8;
 	int parity = 'n';
 	int flow = 'n';
+	unsigned long time_out;
 
 	if (!port->membase) {
 		pr_debug("console on " CDNS_UART_TTY_NAME "%i not present\n",
@@ -1272,6 +1271,13 @@ static int cdns_uart_console_setup(struct console *co, char *options)
 	if (options)
 		uart_parse_options(options, &baud, &parity, &bits, &flow);
 
+	/* Wait for tx_empty before setting up the console */
+	time_out = jiffies + usecs_to_jiffies(TX_TIMEOUT);
+
+	while (time_before(jiffies, time_out) &&
+	       cdns_uart_tx_empty(port) != TIOCSER_TEMT)
+		cpu_relax();
+
 	return uart_set_options(port, co, baud, parity, bits, flow);
 }
 
diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index 0dc3878794fd..477cdc1e9cf3 100644
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -106,7 +106,7 @@ static void sysrq_handle_loglevel(int key)
 	pr_info("Loglevel set to %d\n", i);
 	console_loglevel = i;
 }
-static struct sysrq_key_op sysrq_loglevel_op = {
+static const struct sysrq_key_op sysrq_loglevel_op = {
 	.handler	= sysrq_handle_loglevel,
 	.help_msg	= "loglevel(0-9)",
 	.action_msg	= "Changing Loglevel",
@@ -119,14 +119,14 @@ static void sysrq_handle_SAK(int key)
 	struct work_struct *SAK_work = &vc_cons[fg_console].SAK_work;
 	schedule_work(SAK_work);
 }
-static struct sysrq_key_op sysrq_SAK_op = {
+static const struct sysrq_key_op sysrq_SAK_op = {
 	.handler	= sysrq_handle_SAK,
 	.help_msg	= "sak(k)",
 	.action_msg	= "SAK",
 	.enable_mask	= SYSRQ_ENABLE_KEYBOARD,
 };
 #else
-#define sysrq_SAK_op (*(struct sysrq_key_op *)NULL)
+#define sysrq_SAK_op (*(const struct sysrq_key_op *)NULL)
 #endif
 
 #ifdef CONFIG_VT
@@ -135,14 +135,14 @@ static void sysrq_handle_unraw(int key)
 	vt_reset_unicode(fg_console);
 }
 
-static struct sysrq_key_op sysrq_unraw_op = {
+static const struct sysrq_key_op sysrq_unraw_op = {
 	.handler	= sysrq_handle_unraw,
 	.help_msg	= "unraw(r)",
 	.action_msg	= "Keyboard mode set to system default",
 	.enable_mask	= SYSRQ_ENABLE_KEYBOARD,
 };
 #else
-#define sysrq_unraw_op (*(struct sysrq_key_op *)NULL)
+#define sysrq_unraw_op (*(const struct sysrq_key_op *)NULL)
 #endif /* CONFIG_VT */
 
 static void sysrq_handle_crash(int key)
@@ -152,7 +152,7 @@ static void sysrq_handle_crash(int key)
 
 	panic("sysrq triggered crash\n");
 }
-static struct sysrq_key_op sysrq_crash_op = {
+static const struct sysrq_key_op sysrq_crash_op = {
 	.handler	= sysrq_handle_crash,
 	.help_msg	= "crash(c)",
 	.action_msg	= "Trigger a crash",
@@ -165,18 +165,20 @@ static void sysrq_handle_reboot(int key)
 	local_irq_enable();
 	emergency_restart();
 }
-static struct sysrq_key_op sysrq_reboot_op = {
+static const struct sysrq_key_op sysrq_reboot_op = {
 	.handler	= sysrq_handle_reboot,
 	.help_msg	= "reboot(b)",
 	.action_msg	= "Resetting",
 	.enable_mask	= SYSRQ_ENABLE_BOOT,
 };
 
+const struct sysrq_key_op *__sysrq_reboot_op = &sysrq_reboot_op;
+
 static void sysrq_handle_sync(int key)
 {
 	emergency_sync();
 }
-static struct sysrq_key_op sysrq_sync_op = {
+static const struct sysrq_key_op sysrq_sync_op = {
 	.handler	= sysrq_handle_sync,
 	.help_msg	= "sync(s)",
 	.action_msg	= "Emergency Sync",
@@ -188,7 +190,7 @@ static void sysrq_handle_show_timers(int key)
 	sysrq_timer_list_show();
 }
 
-static struct sysrq_key_op sysrq_show_timers_op = {
+static const struct sysrq_key_op sysrq_show_timers_op = {
 	.handler	= sysrq_handle_show_timers,
 	.help_msg	= "show-all-timers(q)",
 	.action_msg	= "Show clockevent devices & pending hrtimers (no others)",
@@ -198,7 +200,7 @@ static void sysrq_handle_mountro(int key)
 {
 	emergency_remount();
 }
-static struct sysrq_key_op sysrq_mountro_op = {
+static const struct sysrq_key_op sysrq_mountro_op = {
 	.handler	= sysrq_handle_mountro,
 	.help_msg	= "unmount(u)",
 	.action_msg	= "Emergency Remount R/O",
@@ -211,13 +213,13 @@ static void sysrq_handle_showlocks(int key)
 	debug_show_all_locks();
 }
 
-static struct sysrq_key_op sysrq_showlocks_op = {
+static const struct sysrq_key_op sysrq_showlocks_op = {
 	.handler	= sysrq_handle_showlocks,
 	.help_msg	= "show-all-locks(d)",
 	.action_msg	= "Show Locks Held",
 };
 #else
-#define sysrq_showlocks_op (*(struct sysrq_key_op *)NULL)
+#define sysrq_showlocks_op (*(const struct sysrq_key_op *)NULL)
 #endif
 
 #ifdef CONFIG_SMP
@@ -264,7 +266,7 @@ static void sysrq_handle_showallcpus(int key)
 	}
 }
 
-static struct sysrq_key_op sysrq_showallcpus_op = {
+static const struct sysrq_key_op sysrq_showallcpus_op = {
 	.handler	= sysrq_handle_showallcpus,
 	.help_msg	= "show-backtrace-all-active-cpus(l)",
 	.action_msg	= "Show backtrace of all active CPUs",
@@ -282,7 +284,7 @@ static void sysrq_handle_showregs(int key)
 		show_regs(regs);
 	perf_event_print_debug();
 }
-static struct sysrq_key_op sysrq_showregs_op = {
+static const struct sysrq_key_op sysrq_showregs_op = {
 	.handler	= sysrq_handle_showregs,
 	.help_msg	= "show-registers(p)",
 	.action_msg	= "Show Regs",
@@ -294,7 +296,7 @@ static void sysrq_handle_showstate(int key)
 	show_state();
 	show_workqueue_state();
 }
-static struct sysrq_key_op sysrq_showstate_op = {
+static const struct sysrq_key_op sysrq_showstate_op = {
 	.handler	= sysrq_handle_showstate,
 	.help_msg	= "show-task-states(t)",
 	.action_msg	= "Show State",
@@ -305,7 +307,7 @@ static void sysrq_handle_showstate_blocked(int key)
 {
 	show_state_filter(TASK_UNINTERRUPTIBLE);
 }
-static struct sysrq_key_op sysrq_showstate_blocked_op = {
+static const struct sysrq_key_op sysrq_showstate_blocked_op = {
 	.handler	= sysrq_handle_showstate_blocked,
 	.help_msg	= "show-blocked-tasks(w)",
 	.action_msg	= "Show Blocked State",
@@ -319,21 +321,21 @@ static void sysrq_ftrace_dump(int key)
 {
 	ftrace_dump(DUMP_ALL);
 }
-static struct sysrq_key_op sysrq_ftrace_dump_op = {
+static const struct sysrq_key_op sysrq_ftrace_dump_op = {
 	.handler	= sysrq_ftrace_dump,
 	.help_msg	= "dump-ftrace-buffer(z)",
 	.action_msg	= "Dump ftrace buffer",
 	.enable_mask	= SYSRQ_ENABLE_DUMP,
 };
 #else
-#define sysrq_ftrace_dump_op (*(struct sysrq_key_op *)NULL)
+#define sysrq_ftrace_dump_op (*(const struct sysrq_key_op *)NULL)
 #endif
 
 static void sysrq_handle_showmem(int key)
 {
 	show_mem(0, NULL);
 }
-static struct sysrq_key_op sysrq_showmem_op = {
+static const struct sysrq_key_op sysrq_showmem_op = {
 	.handler	= sysrq_handle_showmem,
 	.help_msg	= "show-memory-usage(m)",
 	.action_msg	= "Show Memory",
@@ -364,7 +366,7 @@ static void sysrq_handle_term(int key)
 	send_sig_all(SIGTERM);
 	console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
 }
-static struct sysrq_key_op sysrq_term_op = {
+static const struct sysrq_key_op sysrq_term_op = {
 	.handler	= sysrq_handle_term,
 	.help_msg	= "terminate-all-tasks(e)",
 	.action_msg	= "Terminate All Tasks",
@@ -394,7 +396,7 @@ static void sysrq_handle_moom(int key)
 {
 	schedule_work(&moom_work);
 }
-static struct sysrq_key_op sysrq_moom_op = {
+static const struct sysrq_key_op sysrq_moom_op = {
 	.handler	= sysrq_handle_moom,
 	.help_msg	= "memory-full-oom-kill(f)",
 	.action_msg	= "Manual OOM execution",
@@ -406,7 +408,7 @@ static void sysrq_handle_thaw(int key)
 {
 	emergency_thaw_all();
 }
-static struct sysrq_key_op sysrq_thaw_op = {
+static const struct sysrq_key_op sysrq_thaw_op = {
 	.handler	= sysrq_handle_thaw,
 	.help_msg	= "thaw-filesystems(j)",
 	.action_msg	= "Emergency Thaw of all frozen filesystems",
@@ -419,7 +421,7 @@ static void sysrq_handle_kill(int key)
 	send_sig_all(SIGKILL);
 	console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
 }
-static struct sysrq_key_op sysrq_kill_op = {
+static const struct sysrq_key_op sysrq_kill_op = {
 	.handler	= sysrq_handle_kill,
 	.help_msg	= "kill-all-tasks(i)",
 	.action_msg	= "Kill All Tasks",
@@ -430,7 +432,7 @@ static void sysrq_handle_unrt(int key)
 {
 	normalize_rt_tasks();
 }
-static struct sysrq_key_op sysrq_unrt_op = {
+static const struct sysrq_key_op sysrq_unrt_op = {
 	.handler	= sysrq_handle_unrt,
 	.help_msg	= "nice-all-RT-tasks(n)",
 	.action_msg	= "Nice All RT Tasks",
@@ -440,7 +442,7 @@ static struct sysrq_key_op sysrq_unrt_op = {
 /* Key Operations table and lock */
 static DEFINE_SPINLOCK(sysrq_key_table_lock);
 
-static struct sysrq_key_op *sysrq_key_table[36] = {
+static const struct sysrq_key_op *sysrq_key_table[36] = {
 	&sysrq_loglevel_op,		/* 0 */
 	&sysrq_loglevel_op,		/* 1 */
 	&sysrq_loglevel_op,		/* 2 */
@@ -516,9 +518,9 @@ static int sysrq_key_table_key2index(int key)
 /*
  * get and put functions for the table, exposed to modules.
  */
-struct sysrq_key_op *__sysrq_get_key_op(int key)
+static const struct sysrq_key_op *__sysrq_get_key_op(int key)
 {
-        struct sysrq_key_op *op_p = NULL;
+        const struct sysrq_key_op *op_p = NULL;
         int i;
 
 	i = sysrq_key_table_key2index(key);
@@ -528,7 +530,7 @@ struct sysrq_key_op *__sysrq_get_key_op(int key)
         return op_p;
 }
 
-static void __sysrq_put_key_op(int key, struct sysrq_key_op *op_p)
+static void __sysrq_put_key_op(int key, const struct sysrq_key_op *op_p)
 {
         int i = sysrq_key_table_key2index(key);
 
@@ -538,7 +540,7 @@ static void __sysrq_put_key_op(int key, struct sysrq_key_op *op_p)
 
 void __handle_sysrq(int key, bool check_mask)
 {
-	struct sysrq_key_op *op_p;
+	const struct sysrq_key_op *op_p;
 	int orig_log_level;
 	int orig_suppress_printk;
 	int i;
@@ -1061,8 +1063,8 @@ int sysrq_toggle_support(int enable_mask)
 }
 EXPORT_SYMBOL_GPL(sysrq_toggle_support);
 
-static int __sysrq_swap_key_ops(int key, struct sysrq_key_op *insert_op_p,
-                                struct sysrq_key_op *remove_op_p)
+static int __sysrq_swap_key_ops(int key, const struct sysrq_key_op *insert_op_p,
+                                const struct sysrq_key_op *remove_op_p)
 {
 	int retval;
 
@@ -1085,13 +1087,13 @@ static int __sysrq_swap_key_ops(int key, struct sysrq_key_op *insert_op_p,
 	return retval;
 }
 
-int register_sysrq_key(int key, struct sysrq_key_op *op_p)
+int register_sysrq_key(int key, const struct sysrq_key_op *op_p)
 {
 	return __sysrq_swap_key_ops(key, op_p, NULL);
 }
 EXPORT_SYMBOL(register_sysrq_key);
 
-int unregister_sysrq_key(int key, struct sysrq_key_op *op_p)
+int unregister_sysrq_key(int key, const struct sysrq_key_op *op_p)
 {
 	return __sysrq_swap_key_ops(key, NULL, op_p);
 }
diff --git a/drivers/tty/vcc.c b/drivers/tty/vcc.c
index d2a1e1228c82..9ffd42e333b8 100644
--- a/drivers/tty/vcc.c
+++ b/drivers/tty/vcc.c
@@ -605,6 +605,7 @@ static int vcc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 	port->index = vcc_table_add(port);
 	if (port->index == -1) {
 		pr_err("VCC: no more TTY indices left for allocation\n");
+		rv = -ENOMEM;
 		goto free_ldc;
 	}
 
diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c
index 15d33fa0c925..568b2171f335 100644
--- a/drivers/tty/vt/keyboard.c
+++ b/drivers/tty/vt/keyboard.c
@@ -127,7 +127,11 @@ static DEFINE_SPINLOCK(func_buf_lock); /* guard 'func_buf'  and friends */
 static unsigned long key_down[BITS_TO_LONGS(KEY_CNT)];	/* keyboard key bitmap */
 static unsigned char shift_down[NR_SHIFT];		/* shift state counters.. */
 static bool dead_key_next;
-static int npadch = -1;					/* -1 or number assembled on pad */
+
+/* Handles a number being assembled on the number pad */
+static bool npadch_active;
+static unsigned int npadch_value;
+
 static unsigned int diacr;
 static char rep;					/* flag telling character repeat */
 
@@ -845,12 +849,12 @@ static void k_shift(struct vc_data *vc, unsigned char value, char up_flag)
 		shift_state &= ~(1 << value);
 
 	/* kludge */
-	if (up_flag && shift_state != old_state && npadch != -1) {
+	if (up_flag && shift_state != old_state && npadch_active) {
 		if (kbd->kbdmode == VC_UNICODE)
-			to_utf8(vc, npadch);
+			to_utf8(vc, npadch_value);
 		else
-			put_queue(vc, npadch & 0xff);
-		npadch = -1;
+			put_queue(vc, npadch_value & 0xff);
+		npadch_active = false;
 	}
 }
 
@@ -868,7 +872,7 @@ static void k_meta(struct vc_data *vc, unsigned char value, char up_flag)
 
 static void k_ascii(struct vc_data *vc, unsigned char value, char up_flag)
 {
-	int base;
+	unsigned int base;
 
 	if (up_flag)
 		return;
@@ -882,10 +886,12 @@ static void k_ascii(struct vc_data *vc, unsigned char value, char up_flag)
 		base = 16;
 	}
 
-	if (npadch == -1)
-		npadch = value;
-	else
-		npadch = npadch * base + value;
+	if (!npadch_active) {
+		npadch_value = 0;
+		npadch_active = true;
+	}
+
+	npadch_value = npadch_value * base + value;
 }
 
 static void k_lock(struct vc_data *vc, unsigned char value, char up_flag)
diff --git a/drivers/tty/vt/selection.c b/drivers/tty/vt/selection.c
index d54a549c5892..31bb3647a99c 100644
--- a/drivers/tty/vt/selection.c
+++ b/drivers/tty/vt/selection.c
@@ -185,47 +185,54 @@ int set_selection_user(const struct tiocl_selection __user *sel,
 	return set_selection_kernel(&v, tty);
 }
 
-static int __set_selection_kernel(struct tiocl_selection *v, struct tty_struct *tty)
+static int vc_selection_store_chars(struct vc_data *vc, bool unicode)
 {
-	struct vc_data *vc = vc_cons[fg_console].d;
-	int new_sel_start, new_sel_end, spc;
 	char *bp, *obp;
-	int i, ps, pe;
-	u32 c;
-	int ret = 0;
-	bool unicode;
-
-	poke_blanked_console();
-
-	v->xs = min_t(u16, v->xs - 1, vc->vc_cols - 1);
-	v->ys = min_t(u16, v->ys - 1, vc->vc_rows - 1);
-	v->xe = min_t(u16, v->xe - 1, vc->vc_cols - 1);
-	v->ye = min_t(u16, v->ye - 1, vc->vc_rows - 1);
-	ps = v->ys * vc->vc_size_row + (v->xs << 1);
-	pe = v->ye * vc->vc_size_row + (v->xe << 1);
+	unsigned int i;
 
-	if (v->sel_mode == TIOCL_SELCLEAR) {
-		/* useful for screendump without selection highlights */
+	/* Allocate a new buffer before freeing the old one ... */
+	/* chars can take up to 4 bytes with unicode */
+	bp = kmalloc_array((vc_sel.end - vc_sel.start) / 2 + 1, unicode ? 4 : 1,
+			   GFP_KERNEL);
+	if (!bp) {
+		printk(KERN_WARNING "selection: kmalloc() failed\n");
 		clear_selection();
-		return 0;
+		return -ENOMEM;
 	}
+	kfree(vc_sel.buffer);
+	vc_sel.buffer = bp;
 
-	if (mouse_reporting() && (v->sel_mode & TIOCL_SELMOUSEREPORT)) {
-		mouse_report(tty, v->sel_mode & TIOCL_SELBUTTONMASK, v->xs,
-			     v->ys);
-		return 0;
+	obp = bp;
+	for (i = vc_sel.start; i <= vc_sel.end; i += 2) {
+		u32 c = sel_pos(i, unicode);
+		if (unicode)
+			bp += store_utf8(c, bp);
+		else
+			*bp++ = c;
+		if (!isspace(c))
+			obp = bp;
+		if (!((i + 2) % vc->vc_size_row)) {
+			/* strip trailing blanks from line and add newline,
+			   unless non-space at end of line. */
+			if (obp != bp) {
+				bp = obp;
+				*bp++ = '\r';
+			}
+			obp = bp;
+		}
 	}
+	vc_sel.buf_len = bp - vc_sel.buffer;
 
-	if (ps > pe)	/* make vc_sel.start <= vc_sel.end */
-		swap(ps, pe);
+	return 0;
+}
 
-	if (vc_sel.cons != vc_cons[fg_console].d) {
-		clear_selection();
-		vc_sel.cons = vc_cons[fg_console].d;
-	}
-	unicode = vt_do_kdgkbmode(fg_console) == K_UNICODE;
+static int vc_do_selection(struct vc_data *vc, unsigned short mode, int ps,
+		int pe)
+{
+	int new_sel_start, new_sel_end, spc;
+	bool unicode = vt_do_kdgkbmode(fg_console) == K_UNICODE;
 
-	switch (v->sel_mode) {
+	switch (mode) {
 	case TIOCL_SELCHAR:	/* character-by-character selection */
 		new_sel_start = ps;
 		new_sel_end = pe;
@@ -303,40 +310,44 @@ static int __set_selection_kernel(struct tiocl_selection *v, struct tty_struct *
 	vc_sel.start = new_sel_start;
 	vc_sel.end = new_sel_end;
 
-	/* Allocate a new buffer before freeing the old one ... */
-	/* chars can take up to 4 bytes with unicode */
-	bp = kmalloc_array((vc_sel.end - vc_sel.start) / 2 + 1, unicode ? 4 : 1,
-			   GFP_KERNEL);
-	if (!bp) {
-		printk(KERN_WARNING "selection: kmalloc() failed\n");
+	return vc_selection_store_chars(vc, unicode);
+}
+
+static int vc_selection(struct vc_data *vc, struct tiocl_selection *v,
+		struct tty_struct *tty)
+{
+	int ps, pe;
+
+	poke_blanked_console();
+
+	if (v->sel_mode == TIOCL_SELCLEAR) {
+		/* useful for screendump without selection highlights */
 		clear_selection();
-		return -ENOMEM;
+		return 0;
 	}
-	kfree(vc_sel.buffer);
-	vc_sel.buffer = bp;
 
-	obp = bp;
-	for (i = vc_sel.start; i <= vc_sel.end; i += 2) {
-		c = sel_pos(i, unicode);
-		if (unicode)
-			bp += store_utf8(c, bp);
-		else
-			*bp++ = c;
-		if (!isspace(c))
-			obp = bp;
-		if (! ((i + 2) % vc->vc_size_row)) {
-			/* strip trailing blanks from line and add newline,
-			   unless non-space at end of line. */
-			if (obp != bp) {
-				bp = obp;
-				*bp++ = '\r';
-			}
-			obp = bp;
-		}
+	v->xs = min_t(u16, v->xs - 1, vc->vc_cols - 1);
+	v->ys = min_t(u16, v->ys - 1, vc->vc_rows - 1);
+	v->xe = min_t(u16, v->xe - 1, vc->vc_cols - 1);
+	v->ye = min_t(u16, v->ye - 1, vc->vc_rows - 1);
+
+	if (mouse_reporting() && (v->sel_mode & TIOCL_SELMOUSEREPORT)) {
+		mouse_report(tty, v->sel_mode & TIOCL_SELBUTTONMASK, v->xs,
+			     v->ys);
+		return 0;
 	}
-	vc_sel.buf_len = bp - vc_sel.buffer;
 
-	return ret;
+	ps = v->ys * vc->vc_size_row + (v->xs << 1);
+	pe = v->ye * vc->vc_size_row + (v->xe << 1);
+	if (ps > pe)	/* make vc_sel.start <= vc_sel.end */
+		swap(ps, pe);
+
+	if (vc_sel.cons != vc) {
+		clear_selection();
+		vc_sel.cons = vc;
+	}
+
+	return vc_do_selection(vc, v->sel_mode, ps, pe);
 }
 
 int set_selection_kernel(struct tiocl_selection *v, struct tty_struct *tty)
@@ -345,7 +356,7 @@ int set_selection_kernel(struct tiocl_selection *v, struct tty_struct *tty)
 
 	mutex_lock(&vc_sel.lock);
 	console_lock();
-	ret = __set_selection_kernel(v, tty);
+	ret = vc_selection(vc_cons[fg_console].d, v, tty);
 	console_unlock();
 	mutex_unlock(&vc_sel.lock);
 
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 92f5eba86052..9fd550e7946a 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -10,6 +10,7 @@
 #include <linux/bitops.h>
 #include <linux/compiler.h>
 #include <linux/console.h>
+#include <linux/gpio/consumer.h>
 #include <linux/interrupt.h>
 #include <linux/circ_buf.h>
 #include <linux/spinlock.h>
@@ -251,6 +252,7 @@ struct uart_port {
 	struct attribute_group	*attr_group;		/* port specific attributes */
 	const struct attribute_group **tty_groups;	/* all attributes (serial core use only) */
 	struct serial_rs485     rs485;
+	struct gpio_desc	*rs485_term_gpio;	/* enable RS485 bus termination */
 	struct serial_iso7816   iso7816;
 	void			*private_data;		/* generic platform data pointer */
 };
@@ -472,5 +474,5 @@ extern int uart_handle_break(struct uart_port *port);
 					 (cflag) & CRTSCTS || \
 					 !((cflag) & CLOCAL))
 
-void uart_get_rs485_mode(struct device *dev, struct serial_rs485 *rs485conf);
+int uart_get_rs485_mode(struct uart_port *port);
 #endif /* LINUX_SERIAL_CORE_H */
diff --git a/include/linux/sysrq.h b/include/linux/sysrq.h
index 8e159e16850f..3a582ec7a2f1 100644
--- a/include/linux/sysrq.h
+++ b/include/linux/sysrq.h
@@ -30,10 +30,10 @@
 #define SYSRQ_ENABLE_RTNICE	0x0100
 
 struct sysrq_key_op {
-	void (*handler)(int);
-	char *help_msg;
-	char *action_msg;
-	int enable_mask;
+	void (* const handler)(int);
+	const char * const help_msg;
+	const char * const action_msg;
+	const int enable_mask;
 };
 
 #ifdef CONFIG_MAGIC_SYSRQ
@@ -45,9 +45,9 @@ struct sysrq_key_op {
 
 void handle_sysrq(int key);
 void __handle_sysrq(int key, bool check_mask);
-int register_sysrq_key(int key, struct sysrq_key_op *op);
-int unregister_sysrq_key(int key, struct sysrq_key_op *op);
-struct sysrq_key_op *__sysrq_get_key_op(int key);
+int register_sysrq_key(int key, const struct sysrq_key_op *op);
+int unregister_sysrq_key(int key, const struct sysrq_key_op *op);
+extern const struct sysrq_key_op *__sysrq_reboot_op;
 
 int sysrq_toggle_support(int enable_mask);
 int sysrq_mask(void);
@@ -62,12 +62,12 @@ static inline void __handle_sysrq(int key, bool check_mask)
 {
 }
 
-static inline int register_sysrq_key(int key, struct sysrq_key_op *op)
+static inline int register_sysrq_key(int key, const struct sysrq_key_op *op)
 {
 	return -EINVAL;
 }
 
-static inline int unregister_sysrq_key(int key, struct sysrq_key_op *op)
+static inline int unregister_sysrq_key(int key, const struct sysrq_key_op *op)
 {
 	return -EINVAL;
 }
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index c200d4936679..ccc0f98abdd4 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -935,7 +935,7 @@ static void sysrq_handle_dbg(int key)
 	kgdb_breakpoint();
 }
 
-static struct sysrq_key_op sysrq_dbg_op = {
+static const struct sysrq_key_op sysrq_dbg_op = {
 	.handler	= sysrq_handle_dbg,
 	.help_msg	= "debug(g)",
 	.action_msg	= "DEBUG",
diff --git a/kernel/power/poweroff.c b/kernel/power/poweroff.c
index 6d475281c730..562aa0e450ed 100644
--- a/kernel/power/poweroff.c
+++ b/kernel/power/poweroff.c
@@ -29,7 +29,7 @@ static void handle_poweroff(int key)
 	schedule_work_on(cpumask_first(cpu_online_mask), &poweroff_work);
 }
 
-static struct sysrq_key_op	sysrq_poweroff_op = {
+static const struct sysrq_key_op	sysrq_poweroff_op = {
 	.handler        = handle_poweroff,
 	.help_msg       = "poweroff(o)",
 	.action_msg     = "Power Off",
diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h
index ae76bd329582..54a6dba0280d 100644
--- a/kernel/rcu/tree_stall.h
+++ b/kernel/rcu/tree_stall.h
@@ -807,7 +807,7 @@ static void sysrq_show_rcu(int key)
 	show_rcu_gp_kthreads();
 }
 
-static struct sysrq_key_op sysrq_rcudump_op = {
+static const struct sysrq_key_op sysrq_rcudump_op = {
 	.handler = sysrq_show_rcu,
 	.help_msg = "show-rcu(y)",
 	.action_msg = "Show RCU tree",
author	Linus Torvalds <torvalds@linux-foundation.org>	2020-06-07 09:52:36 -0700
committer	Linus Torvalds <torvalds@linux-foundation.org>	2020-06-07 09:52:36 -0700
commit	081096d98bb23946f16215357b141c5616b234bf (patch)
tree	23638d3369fa0c424c1eae203b4c5821281bd2c1
parent	e611c0fe318c6d6827ee2bba660fbc23cf73f7dc (diff)
parent	a1b44ea340b21c99b34c93acad233da727cb88ba (diff)