spi: pxa2xx: Pass the SSP type via device property

Merge series from Andy Shevchenko <andriy.shevchenko@linux.intel.com>:

Currently the SPI PXA2xx devices on Intel platforms can be instantiated
via the following paths:
 1) as ACPI LPSS device on Haswell, Bay Trail and Cherry Trail;
 2) as ACPI LPSS device on the Sky Lake and newer;
 3) as PCI LPSS device on Haswell, Bay Trail and Cherry Trail;
 4) as PCI LPSS device on the Sky Lake and newer;
 5) as PCI device via ID table.

Each of these cases provides some platform related data differently,
i.e.:
 1) via drivers/acpi/acpi_lpss.c and drivers/spi/spi-pxa2xx.c
 2) via drivers/mfd/intel-lpss-acpi.c
 3) via drivers/spi/spi-pxa2xx-pci.c
 4) via drivers/mfd/intel-lpss-pci.c and drivers/spi/spi-pxa2xx.c
 5) via drivers/spi/spi-pxa2xx-pci.c

This approach has two downsides:

a) there is no data propagated in the case #2 because we can't have
   two or more drivers to match the same ACPI ID and hence some cases
   are still not supported (Sky Lake and newer ACPI enabled LPSS);

b) the data is duplicated over two drivers in the cases #1 & #4 and,
   besides to be a bloatware, it is error prone (e.g. Lakefield has
   a wrong data right now due to missed PCI entry in the spi-pxa2xx.c).

This series fixes the downsides, and enables previously unsupported
cases.

1 files changed, 36 insertions, 135 deletions

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index c9f6a3fbe62f..32cc82a89ec1 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -20,7 +20,6 @@
 #include <linux/module.h>
 #include <linux/mod_devicetable.h>
 #include <linux/of.h>
-#include <linux/pci.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/property.h>
@@ -1322,134 +1321,11 @@ static void cleanup(struct spi_device *spi)
 	kfree(chip);
 }
 
-#ifdef CONFIG_ACPI
-static const struct acpi_device_id pxa2xx_spi_acpi_match[] = {
-	{ "INT33C0", LPSS_LPT_SSP },
-	{ "INT33C1", LPSS_LPT_SSP },
-	{ "INT3430", LPSS_LPT_SSP },
-	{ "INT3431", LPSS_LPT_SSP },
-	{ "80860F0E", LPSS_BYT_SSP },
-	{ "8086228E", LPSS_BSW_SSP },
-	{ },
-};
-MODULE_DEVICE_TABLE(acpi, pxa2xx_spi_acpi_match);
-#endif
-
-/*
- * PCI IDs of compound devices that integrate both host controller and private
- * integrated DMA engine. Please note these are not used in module
- * autoloading and probing in this module but matching the LPSS SSP type.
- */
-static const struct pci_device_id pxa2xx_spi_pci_compound_match[] = {
-	/* SPT-LP */
-	{ PCI_VDEVICE(INTEL, 0x9d29), LPSS_SPT_SSP },
-	{ PCI_VDEVICE(INTEL, 0x9d2a), LPSS_SPT_SSP },
-	/* SPT-H */
-	{ PCI_VDEVICE(INTEL, 0xa129), LPSS_SPT_SSP },
-	{ PCI_VDEVICE(INTEL, 0xa12a), LPSS_SPT_SSP },
-	/* KBL-H */
-	{ PCI_VDEVICE(INTEL, 0xa2a9), LPSS_SPT_SSP },
-	{ PCI_VDEVICE(INTEL, 0xa2aa), LPSS_SPT_SSP },
-	/* CML-V */
-	{ PCI_VDEVICE(INTEL, 0xa3a9), LPSS_SPT_SSP },
-	{ PCI_VDEVICE(INTEL, 0xa3aa), LPSS_SPT_SSP },
-	/* BXT A-Step */
-	{ PCI_VDEVICE(INTEL, 0x0ac2), LPSS_BXT_SSP },
-	{ PCI_VDEVICE(INTEL, 0x0ac4), LPSS_BXT_SSP },
-	{ PCI_VDEVICE(INTEL, 0x0ac6), LPSS_BXT_SSP },
-	/* BXT B-Step */
-	{ PCI_VDEVICE(INTEL, 0x1ac2), LPSS_BXT_SSP },
-	{ PCI_VDEVICE(INTEL, 0x1ac4), LPSS_BXT_SSP },
-	{ PCI_VDEVICE(INTEL, 0x1ac6), LPSS_BXT_SSP },
-	/* GLK */
-	{ PCI_VDEVICE(INTEL, 0x31c2), LPSS_BXT_SSP },
-	{ PCI_VDEVICE(INTEL, 0x31c4), LPSS_BXT_SSP },
-	{ PCI_VDEVICE(INTEL, 0x31c6), LPSS_BXT_SSP },
-	/* ICL-LP */
-	{ PCI_VDEVICE(INTEL, 0x34aa), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x34ab), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x34fb), LPSS_CNL_SSP },
-	/* EHL */
-	{ PCI_VDEVICE(INTEL, 0x4b2a), LPSS_BXT_SSP },
-	{ PCI_VDEVICE(INTEL, 0x4b2b), LPSS_BXT_SSP },
-	{ PCI_VDEVICE(INTEL, 0x4b37), LPSS_BXT_SSP },
-	/* JSL */
-	{ PCI_VDEVICE(INTEL, 0x4daa), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x4dab), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x4dfb), LPSS_CNL_SSP },
-	/* TGL-H */
-	{ PCI_VDEVICE(INTEL, 0x43aa), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x43ab), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x43fb), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x43fd), LPSS_CNL_SSP },
-	/* ADL-P */
-	{ PCI_VDEVICE(INTEL, 0x51aa), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x51ab), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x51fb), LPSS_CNL_SSP },
-	/* ADL-M */
-	{ PCI_VDEVICE(INTEL, 0x54aa), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x54ab), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x54fb), LPSS_CNL_SSP },
-	/* APL */
-	{ PCI_VDEVICE(INTEL, 0x5ac2), LPSS_BXT_SSP },
-	{ PCI_VDEVICE(INTEL, 0x5ac4), LPSS_BXT_SSP },
-	{ PCI_VDEVICE(INTEL, 0x5ac6), LPSS_BXT_SSP },
-	/* RPL-S */
-	{ PCI_VDEVICE(INTEL, 0x7a2a), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x7a2b), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x7a79), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x7a7b), LPSS_CNL_SSP },
-	/* ADL-S */
-	{ PCI_VDEVICE(INTEL, 0x7aaa), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x7aab), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x7af9), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x7afb), LPSS_CNL_SSP },
-	/* MTL-P */
-	{ PCI_VDEVICE(INTEL, 0x7e27), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x7e30), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x7e46), LPSS_CNL_SSP },
-	/* CNL-LP */
-	{ PCI_VDEVICE(INTEL, 0x9daa), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x9dab), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x9dfb), LPSS_CNL_SSP },
-	/* CNL-H */
-	{ PCI_VDEVICE(INTEL, 0xa32a), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0xa32b), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0xa37b), LPSS_CNL_SSP },
-	/* CML-LP */
-	{ PCI_VDEVICE(INTEL, 0x02aa), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x02ab), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x02fb), LPSS_CNL_SSP },
-	/* CML-H */
-	{ PCI_VDEVICE(INTEL, 0x06aa), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x06ab), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0x06fb), LPSS_CNL_SSP },
-	/* TGL-LP */
-	{ PCI_VDEVICE(INTEL, 0xa0aa), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0xa0ab), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0xa0de), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0xa0df), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0xa0fb), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0xa0fd), LPSS_CNL_SSP },
-	{ PCI_VDEVICE(INTEL, 0xa0fe), LPSS_CNL_SSP },
-	{ },
-};
-
-static const struct of_device_id pxa2xx_spi_of_match[] = {
-	{ .compatible = "marvell,mmp2-ssp", .data = (void *)MMP2_SSP },
-	{},
-};
-MODULE_DEVICE_TABLE(of, pxa2xx_spi_of_match);
-
-#ifdef CONFIG_PCI
-
 static bool pxa2xx_spi_idma_filter(struct dma_chan *chan, void *param)
 {
 	return param == chan->device->dev;
 }
 
-#endif /* CONFIG_PCI */
-
 static struct pxa2xx_spi_controller *
 pxa2xx_spi_init_pdata(struct platform_device *pdev)
 {
@@ -1458,22 +1334,29 @@ pxa2xx_spi_init_pdata(struct platform_device *pdev)
 	struct device *parent = dev->parent;
 	struct ssp_device *ssp;
 	struct resource *res;
-	struct pci_dev *pcidev = dev_is_pci(parent) ? to_pci_dev(parent) : NULL;
-	const struct pci_device_id *pcidev_id = NULL;
-	enum pxa_ssp_type type;
+	enum pxa_ssp_type type = SSP_UNDEFINED;
 	const void *match;
+	bool is_lpss_priv;
 	int status;
 	u64 uid;
 
-	if (pcidev)
-		pcidev_id = pci_match_id(pxa2xx_spi_pci_compound_match, pcidev);
+	is_lpss_priv = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lpss_priv");
 
 	match = device_get_match_data(dev);
 	if (match)
 		type = (enum pxa_ssp_type)match;
-	else if (pcidev_id)
-		type = (enum pxa_ssp_type)pcidev_id->driver_data;
-	else
+	else if (is_lpss_priv) {
+		u32 value;
+
+		status = device_property_read_u32(dev, "intel,spi-pxa2xx-type", &value);
+		if (status)
+			return ERR_PTR(status);
+
+		type = (enum pxa_ssp_type)value;
+	}
+
+	/* Validate the SSP type correctness */
+	if (!(type > SSP_UNDEFINED && type < SSP_MAX))
 		return ERR_PTR(-EINVAL);
 
 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
@@ -1488,13 +1371,12 @@ pxa2xx_spi_init_pdata(struct platform_device *pdev)
 
 	ssp->phys_base = res->start;
 
-#ifdef CONFIG_PCI
-	if (pcidev_id) {
+	/* Platforms with iDMA 64-bit */
+	if (is_lpss_priv) {
 		pdata->tx_param = parent;
 		pdata->rx_param = parent;
 		pdata->dma_filter = pxa2xx_spi_idma_filter;
 	}
-#endif
 
 	ssp->clk = devm_clk_get(dev, NULL);
 	if (IS_ERR(ssp->clk))
@@ -1861,6 +1743,25 @@ static const struct dev_pm_ops pxa2xx_spi_pm_ops = {
 	RUNTIME_PM_OPS(pxa2xx_spi_runtime_suspend, pxa2xx_spi_runtime_resume, NULL)
 };
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id pxa2xx_spi_acpi_match[] = {
+	{ "80860F0E", LPSS_BYT_SSP },
+	{ "8086228E", LPSS_BSW_SSP },
+	{ "INT33C0", LPSS_LPT_SSP },
+	{ "INT33C1", LPSS_LPT_SSP },
+	{ "INT3430", LPSS_LPT_SSP },
+	{ "INT3431", LPSS_LPT_SSP },
+	{}
+};
+MODULE_DEVICE_TABLE(acpi, pxa2xx_spi_acpi_match);
+#endif
+
+static const struct of_device_id pxa2xx_spi_of_match[] = {
+	{ .compatible = "marvell,mmp2-ssp", .data = (void *)MMP2_SSP },
+	{}
+};
+MODULE_DEVICE_TABLE(of, pxa2xx_spi_of_match);
+
 static struct platform_driver driver = {
 	.driver = {
 		.name	= "pxa2xx-spi",