Merge tag 'mfd-next-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd

Pull MFD updates from Lee Jones:
 "Core Framework:
   - Add support for Software Nodes to MFD Core
   - Remove support for Device Properties from MFD Core
   - Use standard APIs in MFD Core

  New Drivers:
   - Add support for ROHM BD9576MUF and BD9573MUF PMICs
   - Add support for Netronix Embedded Controller, PWM and RTC
   - Add support for Actions Semi ATC260x PMICs and OnKey

  New Device Support:
   - Add support for DG1 PCIe Graphics Card to Intel PMT
   - Add support for ROHM BD71815 PMIC to ROHM BD71828
   - Add support for Tolino Shine 2 HD to Netronix Embedded Controller
   - Add support for AX10 BMC Secure Updates to Intel M10 BMC

  Removed Device Support:
   - Remove Arizona Extcon support from MFD
   - Remove ST-E AB8500 Power Supply code from MFD
   - Remove AB3100 altogether

  New Functionality:
   - Add support for SMBus and I2C modes to Dialog DA9063
   - Switch to using Software Nodes in Intel (various)

  New/converted Device Tree bindings:
   - rohm bd71815-pmic, rohm bd9576-pmic, netronix ntxec, actions
     atc260x, ricoh rn5t618, qcom pm8xxx

- Fix-ups:
   - Fix error handling/path; intel_pmt
   - Simplify code; rohm-bd718x7, ab8500-core, intel-m10-bmc
   - Trivial clean-ups (reordering, spelling); rohm-generic, rn5t618,
     max8997
   - Use correct data-type; db8500-prcmu
   - Remove superfluous code; lp87565, intel_quark_i2c_gpi, lpc_sch, twl
   - Use generic APIs/defines; lm3533-core, intel_quark_i2c_gpio
   - Regmap related fix-ups; intel-m10-bmc, sec-core
   - Reorder resource freeing during remove; intel_quark_i2c_gpio
   - Make table indexing more robust; intel_quark_i2c_gpio
   - Fix reference imbalances; arizona-irq
   - Staticify and (un)constify things; arizona-spi, stmpe, ene-kb3930,
     intel-lpss-acpi, intel-lpss-pci, atc260x-i2c, intel_quark_i2c_gpio

  Bug Fixes:
   - Fix incorrect (register) values; intel-m10-bmc
   - Kconfig related fixes; ABX500_CORE
   - Do not clear the Auto Reload Register; stm32-timers"

* tag 'mfd-next-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd: (84 commits)
  mfd: intel-m10-bmc: Add support for MAX10 BMC Secure Updates
  Revert "mfd: max8997: Add of_compatible to Extcon and Charger mfd_cell"
  mfd: twl: Remove unused inline function twl4030charger_usb_en()
  dt-bindings: mfd: Convert pm8xxx bindings to yaml
  dt-bindings: mfd: Add compatible for pmk8350 rtc
  i2c: designware: Get rid of legacy platform data
  mfd: intel_quark_i2c_gpio: Convert I²C to use software nodes
  mfd: lpc_sch: Partially revert "Add support for Intel Quark X1000"
  mfd: arizona: Fix rumtime PM imbalance on error
  mfd: max8997: Replace 8998 with 8997
  mfd: core: Use acpi_find_child_device() for child devices lookup
  mfd: intel_quark_i2c_gpio: Don't play dirty trick with const
  mfd: intel_quark_i2c_gpio: Enable MSI interrupt
  mfd: intel_quark_i2c_gpio: Reuse BAR definitions for MFD cell indexing
  mfd: ntxec: Support for EC in Tolino Shine 2 HD
  mfd: stm32-timers: Avoid clearing auto reload register
  mfd: intel_quark_i2c_gpio: Replace I²C speeds with descriptive definitions
  mfd: intel_quark_i2c_gpio: Remove unused struct device member
  mfd: intel_quark_i2c_gpio: Unregister resources in reversed order
  mfd: Kconfig: ABX500_CORE should depend on ARCH_U8500
  ...

4 files changed, 221 insertions, 43 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index ce723dc54aa4..773386b4aeb7 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -501,11 +501,11 @@ config RTC_DRV_M41T80_WDT
 	  watchdog timer in the ST M41T60 and M41T80 RTC chips series.
 
 config RTC_DRV_BD70528
-	tristate "ROHM BD70528 PMIC RTC"
-	depends on MFD_ROHM_BD70528 && (BD70528_WATCHDOG || !BD70528_WATCHDOG)
+	tristate "ROHM BD70528, BD71815 and BD71828 PMIC RTC"
+	depends on MFD_ROHM_BD71828 || MFD_ROHM_BD70528 && (BD70528_WATCHDOG || !BD70528_WATCHDOG)
 	help
 	  If you say Y here you will get support for the RTC
-	  block on ROHM BD70528 and BD71828 Power Management IC.
+	  block on ROHM BD70528, BD71815 and BD71828 Power Management IC.
 
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-bd70528.
@@ -1296,6 +1296,14 @@ config RTC_DRV_CROS_EC
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-cros-ec.
 
+config RTC_DRV_NTXEC
+	tristate "Netronix embedded controller RTC"
+	depends on MFD_NTXEC
+	help
+	  Say yes here if you want to support the RTC functionality of the
+	  embedded controller found in certain e-book readers designed by the
+	  original design manufacturer Netronix.
+
 comment "on-CPU RTC drivers"
 
 config RTC_DRV_ASM9260
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 4e930183c170..2dd0dd956b0e 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -108,6 +108,7 @@ obj-$(CONFIG_RTC_DRV_MT7622)	+= rtc-mt7622.o
 obj-$(CONFIG_RTC_DRV_MV)	+= rtc-mv.o
 obj-$(CONFIG_RTC_DRV_MXC)	+= rtc-mxc.o
 obj-$(CONFIG_RTC_DRV_MXC_V2)	+= rtc-mxc_v2.o
+obj-$(CONFIG_RTC_DRV_NTXEC)	+= rtc-ntxec.o
 obj-$(CONFIG_RTC_DRV_OMAP)	+= rtc-omap.o
 obj-$(CONFIG_RTC_DRV_OPAL)	+= rtc-opal.o
 obj-$(CONFIG_RTC_DRV_PALMAS)	+= rtc-palmas.o
diff --git a/drivers/rtc/rtc-bd70528.c b/drivers/rtc/rtc-bd70528.c
index 17cb67f5bf6e..6454afca02a6 100644
--- a/drivers/rtc/rtc-bd70528.c
+++ b/drivers/rtc/rtc-bd70528.c
@@ -6,6 +6,7 @@
 
 #include <linux/bcd.h>
 #include <linux/mfd/rohm-bd70528.h>
+#include <linux/mfd/rohm-bd71815.h>
 #include <linux/mfd/rohm-bd71828.h>
 #include <linux/module.h>
 #include <linux/of.h>
@@ -14,6 +15,12 @@
 #include <linux/rtc.h>
 
 /*
+ * On BD71828 and BD71815 the ALM0 MASK is 14 bytes after the ALM0
+ * block start
+ */
+#define BD718XX_ALM_EN_OFFSET 14
+
+/*
  * We read regs RTC_SEC => RTC_YEAR
  * this struct is ordered according to chip registers.
  * Keep it u8 only (or packed) to avoid padding issues.
@@ -52,8 +59,10 @@ struct bd70528_rtc_alm {
 
 struct bd70528_rtc {
 	struct rohm_regmap_dev *parent;
+	struct regmap *regmap;
 	struct device *dev;
 	u8 reg_time_start;
+	u8 bd718xx_alm_block_start;
 	bool has_rtc_timers;
 };
 
@@ -234,10 +243,9 @@ static int bd71828_set_alarm(struct device *dev, struct rtc_wkalrm *a)
 	int ret;
 	struct bd71828_rtc_alm alm;
 	struct bd70528_rtc *r = dev_get_drvdata(dev);
-	struct rohm_regmap_dev *parent = r->parent;
 
-	ret = regmap_bulk_read(parent->regmap, BD71828_REG_RTC_ALM_START,
-			       &alm, sizeof(alm));
+	ret = regmap_bulk_read(r->regmap, r->bd718xx_alm_block_start, &alm,
+			       sizeof(alm));
 	if (ret) {
 		dev_err(dev, "Failed to read alarm regs\n");
 		return ret;
@@ -250,8 +258,8 @@ static int bd71828_set_alarm(struct device *dev, struct rtc_wkalrm *a)
 	else
 		alm.alm_mask |= BD70528_MASK_ALM_EN;
 
-	ret = regmap_bulk_write(parent->regmap, BD71828_REG_RTC_ALM_START,
-				&alm, sizeof(alm));
+	ret = regmap_bulk_write(r->regmap, r->bd718xx_alm_block_start, &alm,
+				sizeof(alm));
 	if (ret)
 		dev_err(dev, "Failed to set alarm time\n");
 
@@ -265,17 +273,16 @@ static int bd70528_set_alarm(struct device *dev, struct rtc_wkalrm *a)
 	struct bd70528_rtc_alm alm;
 	int ret;
 	struct bd70528_rtc *r = dev_get_drvdata(dev);
-	struct rohm_regmap_dev *parent = r->parent;
 
-	ret = regmap_bulk_read(parent->regmap, BD70528_REG_RTC_WAKE_START,
-			       &wake, sizeof(wake));
+	ret = regmap_bulk_read(r->regmap, BD70528_REG_RTC_WAKE_START, &wake,
+			       sizeof(wake));
 	if (ret) {
 		dev_err(dev, "Failed to read wake regs\n");
 		return ret;
 	}
 
-	ret = regmap_bulk_read(parent->regmap, BD70528_REG_RTC_ALM_START,
-			       &alm, sizeof(alm));
+	ret = regmap_bulk_read(r->regmap, BD70528_REG_RTC_ALM_START, &alm,
+			       sizeof(alm));
 	if (ret) {
 		dev_err(dev, "Failed to read alarm regs\n");
 		return ret;
@@ -292,15 +299,14 @@ static int bd70528_set_alarm(struct device *dev, struct rtc_wkalrm *a)
 		wake.ctrl &= ~BD70528_MASK_WAKE_EN;
 	}
 
-	ret = regmap_bulk_write(parent->regmap,
-				BD70528_REG_RTC_WAKE_START, &wake,
+	ret = regmap_bulk_write(r->regmap, BD70528_REG_RTC_WAKE_START, &wake,
 				sizeof(wake));
 	if (ret) {
 		dev_err(dev, "Failed to set wake time\n");
 		return ret;
 	}
-	ret = regmap_bulk_write(parent->regmap, BD70528_REG_RTC_ALM_START,
-				&alm, sizeof(alm));
+	ret = regmap_bulk_write(r->regmap, BD70528_REG_RTC_ALM_START, &alm,
+				sizeof(alm));
 	if (ret)
 		dev_err(dev, "Failed to set alarm time\n");
 
@@ -312,10 +318,9 @@ static int bd71828_read_alarm(struct device *dev, struct rtc_wkalrm *a)
 	int ret;
 	struct bd71828_rtc_alm alm;
 	struct bd70528_rtc *r = dev_get_drvdata(dev);
-	struct rohm_regmap_dev *parent = r->parent;
 
-	ret = regmap_bulk_read(parent->regmap, BD71828_REG_RTC_ALM_START,
-			       &alm, sizeof(alm));
+	ret = regmap_bulk_read(r->regmap, r->bd718xx_alm_block_start, &alm,
+			       sizeof(alm));
 	if (ret) {
 		dev_err(dev, "Failed to read alarm regs\n");
 		return ret;
@@ -336,10 +341,9 @@ static int bd70528_read_alarm(struct device *dev, struct rtc_wkalrm *a)
 	struct bd70528_rtc_alm alm;
 	int ret;
 	struct bd70528_rtc *r = dev_get_drvdata(dev);
-	struct rohm_regmap_dev *parent = r->parent;
 
-	ret = regmap_bulk_read(parent->regmap, BD70528_REG_RTC_ALM_START,
-			       &alm, sizeof(alm));
+	ret = regmap_bulk_read(r->regmap, BD70528_REG_RTC_ALM_START, &alm,
+			       sizeof(alm));
 	if (ret) {
 		dev_err(dev, "Failed to read alarm regs\n");
 		return ret;
@@ -360,14 +364,12 @@ static int bd70528_set_time_locked(struct device *dev, struct rtc_time *t)
 	int ret, tmpret, old_states;
 	struct bd70528_rtc_data rtc_data;
 	struct bd70528_rtc *r = dev_get_drvdata(dev);
-	struct rohm_regmap_dev *parent = r->parent;
 
 	ret = bd70528_disable_rtc_based_timers(r, &old_states);
 	if (ret)
 		return ret;
 
-	tmpret = regmap_bulk_read(parent->regmap,
-				  r->reg_time_start, &rtc_data,
+	tmpret = regmap_bulk_read(r->regmap, r->reg_time_start, &rtc_data,
 				  sizeof(rtc_data));
 	if (tmpret) {
 		dev_err(dev, "Failed to read RTC time registers\n");
@@ -375,8 +377,7 @@ static int bd70528_set_time_locked(struct device *dev, struct rtc_time *t)
 	}
 	tm2rtc(t, &rtc_data);
 
-	tmpret = regmap_bulk_write(parent->regmap,
-				   r->reg_time_start, &rtc_data,
+	tmpret = regmap_bulk_write(r->regmap, r->reg_time_start, &rtc_data,
 				   sizeof(rtc_data));
 	if (tmpret) {
 		dev_err(dev, "Failed to set RTC time\n");
@@ -410,13 +411,11 @@ static int bd70528_set_time(struct device *dev, struct rtc_time *t)
 static int bd70528_get_time(struct device *dev, struct rtc_time *t)
 {
 	struct bd70528_rtc *r = dev_get_drvdata(dev);
-	struct rohm_regmap_dev *parent = r->parent;
 	struct bd70528_rtc_data rtc_data;
 	int ret;
 
 	/* read the RTC date and time registers all at once */
-	ret = regmap_bulk_read(parent->regmap,
-			       r->reg_time_start, &rtc_data,
+	ret = regmap_bulk_read(r->regmap, r->reg_time_start, &rtc_data,
 			       sizeof(rtc_data));
 	if (ret) {
 		dev_err(dev, "Failed to read RTC time (err %d)\n", ret);
@@ -443,7 +442,7 @@ static int bd70528_alm_enable(struct device *dev, unsigned int enabled)
 		dev_err(dev, "Failed to change wake state\n");
 		goto out_unlock;
 	}
-	ret = regmap_update_bits(r->parent->regmap, BD70528_REG_RTC_ALM_MASK,
+	ret = regmap_update_bits(r->regmap, BD70528_REG_RTC_ALM_MASK,
 				 BD70528_MASK_ALM_EN, enableval);
 	if (ret)
 		dev_err(dev, "Failed to change alarm state\n");
@@ -462,8 +461,9 @@ static int bd71828_alm_enable(struct device *dev, unsigned int enabled)
 	if (!enabled)
 		enableval = 0;
 
-	ret = regmap_update_bits(r->parent->regmap, BD71828_REG_RTC_ALM0_MASK,
-				 BD70528_MASK_ALM_EN, enableval);
+	ret = regmap_update_bits(r->regmap, r->bd718xx_alm_block_start +
+				 BD718XX_ALM_EN_OFFSET, BD70528_MASK_ALM_EN,
+				 enableval);
 	if (ret)
 		dev_err(dev, "Failed to change alarm state\n");
 
@@ -498,7 +498,6 @@ static int bd70528_probe(struct platform_device *pdev)
 {
 	struct bd70528_rtc *bd_rtc;
 	const struct rtc_class_ops *rtc_ops;
-	struct rohm_regmap_dev *parent;
 	const char *irq_name;
 	int ret;
 	struct rtc_device *rtc;
@@ -508,20 +507,25 @@ static int bd70528_probe(struct platform_device *pdev)
 	u8 hour_reg;
 	enum rohm_chip_type chip = platform_get_device_id(pdev)->driver_data;
 
-	parent = dev_get_drvdata(pdev->dev.parent);
-	if (!parent) {
-		dev_err(&pdev->dev, "No MFD driver data\n");
-		return -EINVAL;
-	}
 	bd_rtc = devm_kzalloc(&pdev->dev, sizeof(*bd_rtc), GFP_KERNEL);
 	if (!bd_rtc)
 		return -ENOMEM;
 
-	bd_rtc->parent = parent;
+	bd_rtc->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!bd_rtc->regmap) {
+		dev_err(&pdev->dev, "No regmap\n");
+		return -EINVAL;
+	}
+
 	bd_rtc->dev = &pdev->dev;
 
 	switch (chip) {
 	case ROHM_CHIP_TYPE_BD70528:
+		bd_rtc->parent = dev_get_drvdata(pdev->dev.parent);
+		if (!bd_rtc->parent) {
+			dev_err(&pdev->dev, "No MFD data\n");
+			return -EINVAL;
+		}
 		irq_name = "bd70528-rtc-alm";
 		bd_rtc->has_rtc_timers = true;
 		bd_rtc->reg_time_start = BD70528_REG_RTC_START;
@@ -529,9 +533,28 @@ static int bd70528_probe(struct platform_device *pdev)
 		enable_main_irq = true;
 		rtc_ops = &bd70528_rtc_ops;
 		break;
+	case ROHM_CHIP_TYPE_BD71815:
+		irq_name = "bd71815-rtc-alm-0";
+		bd_rtc->reg_time_start = BD71815_REG_RTC_START;
+
+		/*
+		 * See also BD718XX_ALM_EN_OFFSET:
+		 * This works for BD71828 and BD71815 as they have same offset
+		 * between ALM0 start and ALM0_MASK. If new ICs are to be
+		 * added this requires proper check as ALM0_MASK is not located
+		 * at the end of ALM0 block - but after all ALM blocks so if
+		 * amount of ALMs differ the offset to enable/disable is likely
+		 * to be incorrect and enable/disable must be given as own
+		 * reg address here.
+		 */
+		bd_rtc->bd718xx_alm_block_start = BD71815_REG_RTC_ALM_START;
+		hour_reg = BD71815_REG_HOUR;
+		rtc_ops = &bd71828_rtc_ops;
+		break;
 	case ROHM_CHIP_TYPE_BD71828:
 		irq_name = "bd71828-rtc-alm-0";
 		bd_rtc->reg_time_start = BD71828_REG_RTC_START;
+		bd_rtc->bd718xx_alm_block_start = BD71828_REG_RTC_ALM_START;
 		hour_reg = BD71828_REG_RTC_HOUR;
 		rtc_ops = &bd71828_rtc_ops;
 		break;
@@ -547,7 +570,7 @@ static int bd70528_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, bd_rtc);
 
-	ret = regmap_read(parent->regmap, hour_reg, &hr);
+	ret = regmap_read(bd_rtc->regmap, hour_reg, &hr);
 
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to reag RTC clock\n");
@@ -595,7 +618,7 @@ static int bd70528_probe(struct platform_device *pdev)
 	 *  from sub-registers when IRQ is disabled or freed.
 	 */
 	if (enable_main_irq) {
-		ret = regmap_update_bits(parent->regmap,
+		ret = regmap_update_bits(bd_rtc->regmap,
 				 BD70528_REG_INT_MAIN_MASK,
 				 BD70528_INT_RTC_MASK, 0);
 		if (ret) {
@@ -610,6 +633,7 @@ static int bd70528_probe(struct platform_device *pdev)
 static const struct platform_device_id bd718x7_rtc_id[] = {
 	{ "bd70528-rtc", ROHM_CHIP_TYPE_BD70528 },
 	{ "bd71828-rtc", ROHM_CHIP_TYPE_BD71828 },
+	{ "bd71815-rtc", ROHM_CHIP_TYPE_BD71815 },
 	{ },
 };
 MODULE_DEVICE_TABLE(platform, bd718x7_rtc_id);
diff --git a/drivers/rtc/rtc-ntxec.c b/drivers/rtc/rtc-ntxec.c
new file mode 100644
index 000000000000..850ca49186fd
--- /dev/null
+++ b/drivers/rtc/rtc-ntxec.c
@@ -0,0 +1,145 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * The Netronix embedded controller is a microcontroller found in some
+ * e-book readers designed by the original design manufacturer Netronix, Inc.
+ * It contains RTC, battery monitoring, system power management, and PWM
+ * functionality.
+ *
+ * This driver implements access to the RTC time and date.
+ *
+ * Copyright 2020 Jonathan Neuschäfer <j.neuschaefer@gmx.net>
+ */
+
+#include <linux/mfd/ntxec.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/rtc.h>
+#include <linux/types.h>
+
+struct ntxec_rtc {
+	struct device *dev;
+	struct ntxec *ec;
+};
+
+#define NTXEC_REG_WRITE_YEAR	0x10
+#define NTXEC_REG_WRITE_MONTH	0x11
+#define NTXEC_REG_WRITE_DAY	0x12
+#define NTXEC_REG_WRITE_HOUR	0x13
+#define NTXEC_REG_WRITE_MINUTE	0x14
+#define NTXEC_REG_WRITE_SECOND	0x15
+
+#define NTXEC_REG_READ_YEAR_MONTH	0x20
+#define NTXEC_REG_READ_MDAY_HOUR	0x21
+#define NTXEC_REG_READ_MINUTE_SECOND	0x23
+
+static int ntxec_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct ntxec_rtc *rtc = dev_get_drvdata(dev);
+	unsigned int value;
+	int res;
+
+retry:
+	res = regmap_read(rtc->ec->regmap, NTXEC_REG_READ_MINUTE_SECOND, &value);
+	if (res < 0)
+		return res;
+
+	tm->tm_min = value >> 8;
+	tm->tm_sec = value & 0xff;
+
+	res = regmap_read(rtc->ec->regmap, NTXEC_REG_READ_MDAY_HOUR, &value);
+	if (res < 0)
+		return res;
+
+	tm->tm_mday = value >> 8;
+	tm->tm_hour = value & 0xff;
+
+	res = regmap_read(rtc->ec->regmap, NTXEC_REG_READ_YEAR_MONTH, &value);
+	if (res < 0)
+		return res;
+
+	tm->tm_year = (value >> 8) + 100;
+	tm->tm_mon = (value & 0xff) - 1;
+
+	/*
+	 * Read the minutes/seconds field again. If it changed since the first
+	 * read, we can't assume that the values read so far are consistent,
+	 * and should start from the beginning.
+	 */
+	res = regmap_read(rtc->ec->regmap, NTXEC_REG_READ_MINUTE_SECOND, &value);
+	if (res < 0)
+		return res;
+
+	if (tm->tm_min != value >> 8 || tm->tm_sec != (value & 0xff))
+		goto retry;
+
+	return 0;
+}
+
+static int ntxec_set_time(struct device *dev, struct rtc_time *tm)
+{
+	struct ntxec_rtc *rtc = dev_get_drvdata(dev);
+
+	/*
+	 * To avoid time overflows while we're writing the full date/time,
+	 * set the seconds field to zero before doing anything else. For the
+	 * next 59 seconds (plus however long it takes until the RTC's next
+	 * update of the second field), the seconds field will not overflow
+	 * into the other fields.
+	 */
+	struct reg_sequence regs[] = {
+		{ NTXEC_REG_WRITE_SECOND, ntxec_reg8(0) },
+		{ NTXEC_REG_WRITE_YEAR, ntxec_reg8(tm->tm_year - 100) },
+		{ NTXEC_REG_WRITE_MONTH, ntxec_reg8(tm->tm_mon + 1) },
+		{ NTXEC_REG_WRITE_DAY, ntxec_reg8(tm->tm_mday) },
+		{ NTXEC_REG_WRITE_HOUR, ntxec_reg8(tm->tm_hour) },
+		{ NTXEC_REG_WRITE_MINUTE, ntxec_reg8(tm->tm_min) },
+		{ NTXEC_REG_WRITE_SECOND, ntxec_reg8(tm->tm_sec) },
+	};
+
+	return regmap_multi_reg_write(rtc->ec->regmap, regs, ARRAY_SIZE(regs));
+}
+
+static const struct rtc_class_ops ntxec_rtc_ops = {
+	.read_time = ntxec_read_time,
+	.set_time = ntxec_set_time,
+};
+
+static int ntxec_rtc_probe(struct platform_device *pdev)
+{
+	struct rtc_device *dev;
+	struct ntxec_rtc *rtc;
+
+	pdev->dev.of_node = pdev->dev.parent->of_node;
+
+	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
+	if (!rtc)
+		return -ENOMEM;
+
+	rtc->dev = &pdev->dev;
+	rtc->ec = dev_get_drvdata(pdev->dev.parent);
+	platform_set_drvdata(pdev, rtc);
+
+	dev = devm_rtc_allocate_device(&pdev->dev);
+	if (IS_ERR(dev))
+		return PTR_ERR(dev);
+
+	dev->ops = &ntxec_rtc_ops;
+	dev->range_min = RTC_TIMESTAMP_BEGIN_2000;
+	dev->range_max = 9025257599LL; /* 2255-12-31 23:59:59 */
+
+	return devm_rtc_register_device(dev);
+}
+
+static struct platform_driver ntxec_rtc_driver = {
+	.driver = {
+		.name = "ntxec-rtc",
+	},
+	.probe = ntxec_rtc_probe,
+};
+module_platform_driver(ntxec_rtc_driver);
+
+MODULE_AUTHOR("Jonathan Neuschäfer <j.neuschaefer@gmx.net>");
+MODULE_DESCRIPTION("RTC driver for Netronix EC");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ntxec-rtc");