[PATCH v1 00/10] spi: pxa2xx: Get rid of an additional layer in PCI driver

[PATCH v1 00/10] spi: pxa2xx: Get rid of an additional layer in PCI driver

[Andy Shevchenko]

SPI PXA2xx main driver is a compound of a core library and
a platform driver code. Decoupling that allows to eventually
get rid of an additional layer of devices hierarchy in PCI driver.
There are also precursor cleanups.

Andy Shevchenko (10):
  spi: pxa2xx: Reorganize the SSP type retrieval
  spi: pxa2xx: Remove no more needed driver data
  spi: pxa2xx: Remove hard coded number of chip select pins
  spi: pxa2xx: Utilise temporary variable for struct device
  spi: pxa2xx: Print DMA burst size only when DMA is enabled
  spi: pxa2xx: Remove duplicate check
  spi: pxa2xx: Remove superflous check for Intel Atom SoCs
  spi: pxa2xx: Extract pxa2xx_spi_platform_*() callbacks
  spi: pxa2xx: Move platform driver to a separate file
  spi: pxa2xx: Convert PCI driver to use spi-pxa2xx code directly

 drivers/spi/Makefile              |   3 +-
 drivers/spi/spi-pxa2xx-pci.c      |  39 ++---
 drivers/spi/spi-pxa2xx-platform.c | 201 +++++++++++++++++++++++++
 drivers/spi/spi-pxa2xx.c          | 239 ++++--------------------------
 drivers/spi/spi-pxa2xx.h          |   6 +
 5 files changed, 253 insertions(+), 235 deletions(-)
 create mode 100644 drivers/spi/spi-pxa2xx-platform.c

-- 
2.43.0.rc1.1336.g36b5255a03ac

[PATCH v1 01/10] spi: pxa2xx: Reorganize the SSP type retrieval

[Andy Shevchenko]

The old Intel platforms, such as Intel Braswell, also provide
the property of SSP type. Reorganize the pxa2xx_spi_init_pdata()
to take that into account.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx.c | 22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index efe76d0c21bb..877fb6d01cd1 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -1310,19 +1310,20 @@ pxa2xx_spi_init_pdata(struct platform_device *pdev)
 	struct pxa2xx_spi_controller *pdata;
 	struct device *dev = &pdev->dev;
 	struct device *parent = dev->parent;
+	const void *match = device_get_match_data(dev);
 	enum pxa_ssp_type type = SSP_UNDEFINED;
 	struct ssp_device *ssp = NULL;
-	const void *match;
 	bool is_lpss_priv;
 	u32 num_cs = 1;
 	int status;
 
-	is_lpss_priv = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lpss_priv");
-
-	match = device_get_match_data(dev);
-	if (match)
-		type = (uintptr_t)match;
-	else if (is_lpss_priv) {
+	ssp = pxa_ssp_request(pdev->id, pdev->name);
+	if (ssp) {
+		type = ssp->type;
+		pxa_ssp_free(ssp);
+	} else if (match) {
+		type = (enum pxa_ssp_type)(uintptr_t)match;
+	} else {
 		u32 value;
 
 		status = device_property_read_u32(dev, "intel,spi-pxa2xx-type", &value);
@@ -1330,12 +1331,6 @@ pxa2xx_spi_init_pdata(struct platform_device *pdev)
 			return ERR_PTR(status);
 
 		type = (enum pxa_ssp_type)value;
-	} else {
-		ssp = pxa_ssp_request(pdev->id, pdev->name);
-		if (ssp) {
-			type = ssp->type;
-			pxa_ssp_free(ssp);
-		}
 	}
 
 	/* Validate the SSP type correctness */
@@ -1347,6 +1342,7 @@ pxa2xx_spi_init_pdata(struct platform_device *pdev)
 		return ERR_PTR(-ENOMEM);
 
 	/* Platforms with iDMA 64-bit */
+	is_lpss_priv = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lpss_priv");
 	if (is_lpss_priv) {
 		pdata->tx_param = parent;
 		pdata->rx_param = parent;
-- 
2.43.0.rc1.1336.g36b5255a03ac

[PATCH v1 02/10] spi: pxa2xx: Remove no more needed driver data

[Andy Shevchenko]

Since the ACPI enumerated devices provide a property with SSP type,
there is no more necessity to bear the copy of them in the ID table.
Drop the driver data in ACPI ID table.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 877fb6d01cd1..dee5513936ec 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -1703,12 +1703,12 @@ static const struct dev_pm_ops pxa2xx_spi_pm_ops = {
 };
 
 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 },
+	{ "80860F0E" },
+	{ "8086228E" },
+	{ "INT33C0" },
+	{ "INT33C1" },
+	{ "INT3430" },
+	{ "INT3431" },
 	{}
 };
 MODULE_DEVICE_TABLE(acpi, pxa2xx_spi_acpi_match);
-- 
2.43.0.rc1.1336.g36b5255a03ac

[PATCH v1 03/10] spi: pxa2xx: Remove hard coded number of chip select pins

[Andy Shevchenko]

Remove hard coded number of chip select pins for Intel Braswell.
This comes via property.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index dee5513936ec..e7087228505e 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -99,7 +99,6 @@ struct lpss_config {
 	/* Chip select control */
 	unsigned cs_sel_shift;
 	unsigned cs_sel_mask;
-	unsigned cs_num;
 	/* Quirks */
 	unsigned cs_clk_stays_gated : 1;
 };
@@ -137,7 +136,6 @@ static const struct lpss_config lpss_platforms[] = {
 		.tx_threshold_hi = 224,
 		.cs_sel_shift = 2,
 		.cs_sel_mask = 1 << 2,
-		.cs_num = 2,
 	},
 	{	/* LPSS_SPT_SSP */
 		.offset = 0x200,
@@ -1574,8 +1572,6 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
 			tmp &= LPSS_CAPS_CS_EN_MASK;
 			tmp >>= LPSS_CAPS_CS_EN_SHIFT;
 			platform_info->num_chipselect = ffz(tmp);
-		} else if (config->cs_num) {
-			platform_info->num_chipselect = config->cs_num;
 		}
 	}
 	controller->num_chipselect = platform_info->num_chipselect;
-- 
2.43.0.rc1.1336.g36b5255a03ac

[PATCH v1 04/10] spi: pxa2xx: Utilise temporary variable for struct device

[Andy Shevchenko]

We have a temporary variable to keep a pointer to struct device.
Utilise it where it makes sense.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index e7087228505e..56ff296925b7 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -1586,13 +1586,13 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
 		}
 	}
 
-	pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
-	pm_runtime_use_autosuspend(&pdev->dev);
-	pm_runtime_set_active(&pdev->dev);
-	pm_runtime_enable(&pdev->dev);
+	pm_runtime_set_autosuspend_delay(dev, 50);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
 
 	/* Register with the SPI framework */
-	platform_set_drvdata(pdev, drv_data);
+	dev_set_drvdata(dev, drv_data);
 	status = spi_register_controller(controller);
 	if (status) {
 		dev_err_probe(dev, status, "problem registering SPI controller\n");
@@ -1602,7 +1602,7 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
 	return status;
 
 out_error_pm_runtime_enabled:
-	pm_runtime_disable(&pdev->dev);
+	pm_runtime_disable(dev);
 
 out_error_clock_enabled:
 	clk_disable_unprepare(ssp->clk);
@@ -1618,10 +1618,11 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
 
 static void pxa2xx_spi_remove(struct platform_device *pdev)
 {
-	struct driver_data *drv_data = platform_get_drvdata(pdev);
+	struct device *dev = &pdev->dev;
+	struct driver_data *drv_data = dev_get_drvdata(dev);
 	struct ssp_device *ssp = drv_data->ssp;
 
-	pm_runtime_get_sync(&pdev->dev);
+	pm_runtime_get_sync(dev);
 
 	spi_unregister_controller(drv_data->controller);
 
@@ -1633,8 +1634,8 @@ static void pxa2xx_spi_remove(struct platform_device *pdev)
 	if (drv_data->controller_info->enable_dma)
 		pxa2xx_spi_dma_release(drv_data);
 
-	pm_runtime_put_noidle(&pdev->dev);
-	pm_runtime_disable(&pdev->dev);
+	pm_runtime_put_noidle(dev);
+	pm_runtime_disable(dev);
 
 	/* Release IRQ */
 	free_irq(ssp->irq, drv_data);
-- 
2.43.0.rc1.1336.g36b5255a03ac

[PATCH v1 05/10] spi: pxa2xx: Print DMA burst size only when DMA is enabled

[Andy Shevchenko]

Print DMA burst size only when DMA is enabled to avoid making
a false impression that DMA is enabled when it may be not.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 56ff296925b7..6bbeb1d09ed9 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -1412,7 +1412,6 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
 		if (IS_ERR(platform_info))
 			return dev_err_probe(dev, PTR_ERR(platform_info), "missing platform data\n");
 	}
-	dev_dbg(dev, "DMA burst size set to %u\n", platform_info->dma_burst_size);
 
 	ssp = pxa_ssp_request(pdev->id, pdev->name);
 	if (!ssp)
@@ -1496,6 +1495,8 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
 			controller->max_dma_len = MAX_DMA_LEN;
 			controller->max_transfer_size =
 				pxa2xx_spi_max_dma_transfer_size;
+
+			dev_dbg(dev, "DMA burst size set to %u\n", platform_info->dma_burst_size);
 		}
 	}
 
-- 
2.43.0.rc1.1336.g36b5255a03ac

[PATCH v1 06/10] spi: pxa2xx: Remove duplicate check

[Andy Shevchenko]

The mmio_base can't be NULL at this point. It's either checked
in both pxa_ssp_probe() and pxa2xx_spi_init_ssp() or correctly
provided by PCI core. Hence, remove duplicate check which is
a dead code.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 6bbeb1d09ed9..cd28b798b53b 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -1417,9 +1417,6 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
 	if (!ssp)
 		ssp = &platform_info->ssp;
 
-	if (!ssp->mmio_base)
-		return dev_err_probe(dev, -ENODEV, "failed to get SSP\n");
-
 	if (platform_info->is_target)
 		controller = devm_spi_alloc_target(dev, sizeof(*drv_data));
 	else
-- 
2.43.0.rc1.1336.g36b5255a03ac

[PATCH v1 07/10] spi: pxa2xx: Remove superflous check for Intel Atom SoCs

[Andy Shevchenko]

pxa2xx_spi_fw_translate_cs() checks for the ACPI companion device
presence along with the SSP type. But the SSP type is uniquely
determines the case. Hence remove the superflous check.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx.c | 26 +++++++++++---------------
 1 file changed, 11 insertions(+), 15 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index cd28b798b53b..3ea4b9821a8e 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -1371,23 +1371,19 @@ static int pxa2xx_spi_fw_translate_cs(struct spi_controller *controller,
 {
 	struct driver_data *drv_data = spi_controller_get_devdata(controller);
 
-	if (has_acpi_companion(drv_data->ssp->dev)) {
-		switch (drv_data->ssp_type) {
-		/*
-		 * For Atoms the ACPI DeviceSelection used by the Windows
-		 * driver starts from 1 instead of 0 so translate it here
-		 * to match what Linux expects.
-		 */
-		case LPSS_BYT_SSP:
-		case LPSS_BSW_SSP:
-			return cs - 1;
+	switch (drv_data->ssp_type) {
+	/*
+	 * For some of Intel Atoms the ACPI DeviceSelection used by the Windows
+	 * driver starts from 1 instead of 0 so translate it here to match what
+	 * Linux expects.
+	 */
+	case LPSS_BYT_SSP:
+	case LPSS_BSW_SSP:
+		return cs - 1;
 
-		default:
-			break;
-		}
+	default:
+		return cs;
 	}
-
-	return cs;
 }
 
 static size_t pxa2xx_spi_max_dma_transfer_size(struct spi_device *spi)
-- 
2.43.0.rc1.1336.g36b5255a03ac

[PATCH v1 08/10] spi: pxa2xx: Extract pxa2xx_spi_platform_*() callbacks

[Andy Shevchenko]

In preparation of the extracting platform driver from spi-pxa2xx.c
split the probe and remove functions so we have bus independent
and platform device ones.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx.c | 63 +++++++++++++++++++++++++++-------------
 1 file changed, 43 insertions(+), 20 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 3ea4b9821a8e..f53827d61a21 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -1391,28 +1391,16 @@ static size_t pxa2xx_spi_max_dma_transfer_size(struct spi_device *spi)
 	return MAX_DMA_LEN;
 }
 
-static int pxa2xx_spi_probe(struct platform_device *pdev)
+static int pxa2xx_spi_probe(struct device *dev, struct ssp_device *ssp)
 {
-	struct device *dev = &pdev->dev;
 	struct pxa2xx_spi_controller *platform_info;
 	struct spi_controller *controller;
 	struct driver_data *drv_data;
-	struct ssp_device *ssp;
 	const struct lpss_config *config;
 	int status;
 	u32 tmp;
 
 	platform_info = dev_get_platdata(dev);
-	if (!platform_info) {
-		platform_info = pxa2xx_spi_init_pdata(pdev);
-		if (IS_ERR(platform_info))
-			return dev_err_probe(dev, PTR_ERR(platform_info), "missing platform data\n");
-	}
-
-	ssp = pxa_ssp_request(pdev->id, pdev->name);
-	if (!ssp)
-		ssp = &platform_info->ssp;
-
 	if (platform_info->is_target)
 		controller = devm_spi_alloc_target(dev, sizeof(*drv_data));
 	else
@@ -1610,9 +1598,8 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
 	return status;
 }
 
-static void pxa2xx_spi_remove(struct platform_device *pdev)
+static void pxa2xx_spi_remove(struct device *dev)
 {
-	struct device *dev = &pdev->dev;
 	struct driver_data *drv_data = dev_get_drvdata(dev);
 	struct ssp_device *ssp = drv_data->ssp;
 
@@ -1633,9 +1620,6 @@ static void pxa2xx_spi_remove(struct platform_device *pdev)
 
 	/* Release IRQ */
 	free_irq(ssp->irq, drv_data);
-
-	/* Release SSP */
-	pxa_ssp_free(ssp);
 }
 
 static int pxa2xx_spi_suspend(struct device *dev)
@@ -1693,6 +1677,45 @@ static const struct dev_pm_ops pxa2xx_spi_pm_ops = {
 	RUNTIME_PM_OPS(pxa2xx_spi_runtime_suspend, pxa2xx_spi_runtime_resume, NULL)
 };
 
+static int pxa2xx_spi_platform_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct pxa2xx_spi_controller *platform_info;
+	struct ssp_device *ssp;
+	int status;
+
+	platform_info = dev_get_platdata(dev);
+	if (!platform_info) {
+		platform_info = pxa2xx_spi_init_pdata(pdev);
+		if (IS_ERR(platform_info))
+			return dev_err_probe(dev, PTR_ERR(platform_info), "missing platform data\n");
+
+		dev->platform_data = platform_info;
+
+	}
+
+	ssp = pxa_ssp_request(pdev->id, pdev->name);
+	if (!ssp)
+		ssp = &platform_info->ssp;
+
+	status = pxa2xx_spi_probe(dev, ssp);
+	if (status)
+		pxa_ssp_free(ssp);
+
+	return status;
+}
+
+static void pxa2xx_spi_platform_remove(struct platform_device *pdev)
+{
+	struct driver_data *drv_data = platform_get_drvdata(pdev);
+	struct ssp_device *ssp = drv_data->ssp;
+
+	pxa2xx_spi_remove(&pdev->dev);
+
+	/* Release SSP */
+	pxa_ssp_free(ssp);
+}
+
 static const struct acpi_device_id pxa2xx_spi_acpi_match[] = {
 	{ "80860F0E" },
 	{ "8086228E" },
@@ -1717,8 +1740,8 @@ static struct platform_driver driver = {
 		.acpi_match_table = pxa2xx_spi_acpi_match,
 		.of_match_table = pxa2xx_spi_of_match,
 	},
-	.probe = pxa2xx_spi_probe,
-	.remove_new = pxa2xx_spi_remove,
+	.probe = pxa2xx_spi_platform_probe,
+	.remove_new = pxa2xx_spi_platform_remove,
 };
 
 static int __init pxa2xx_spi_init(void)
-- 
2.43.0.rc1.1336.g36b5255a03ac

[PATCH v1 09/10] spi: pxa2xx: Move platform driver to a separate file

[Andy Shevchenko]

The spi-pxa2xx.c is bloated with a platform driver code while
pretending to provide a core functionality. Make it real core
library by splitting out the platform driver to a separate file.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/Makefile              |   3 +-
 drivers/spi/spi-pxa2xx-platform.c | 201 +++++++++++++++++++++++++++++
 drivers/spi/spi-pxa2xx.c          | 203 ++----------------------------
 drivers/spi/spi-pxa2xx.h          |   6 +
 4 files changed, 217 insertions(+), 196 deletions(-)
 create mode 100644 drivers/spi/spi-pxa2xx-platform.c

diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index e694254dec04..bcfb6efd88e0 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -107,7 +107,8 @@ obj-$(CONFIG_SPI_PIC32)			+= spi-pic32.o
 obj-$(CONFIG_SPI_PIC32_SQI)		+= spi-pic32-sqi.o
 obj-$(CONFIG_SPI_PL022)			+= spi-pl022.o
 obj-$(CONFIG_SPI_PPC4xx)		+= spi-ppc4xx.o
-spi-pxa2xx-platform-objs		:= spi-pxa2xx.o spi-pxa2xx-dma.o
+obj-$(CONFIG_SPI_PXA2XX)		+= spi-pxa2xx-core.o
+spi-pxa2xx-core-y			:= spi-pxa2xx.o spi-pxa2xx-dma.o
 obj-$(CONFIG_SPI_PXA2XX)		+= spi-pxa2xx-platform.o
 obj-$(CONFIG_SPI_PXA2XX_PCI)		+= spi-pxa2xx-pci.o
 obj-$(CONFIG_SPI_QCOM_GENI)		+= spi-geni-qcom.o
diff --git a/drivers/spi/spi-pxa2xx-platform.c b/drivers/spi/spi-pxa2xx-platform.c
new file mode 100644
index 000000000000..081ab31bb49d
--- /dev/null
+++ b/drivers/spi/spi-pxa2xx-platform.c
@@ -0,0 +1,201 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/acpi.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/types.h>
+
+#include "spi-pxa2xx.h"
+
+static int
+pxa2xx_spi_init_ssp(struct platform_device *pdev, struct ssp_device *ssp, enum pxa_ssp_type type)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	int status;
+	u64 uid;
+
+	ssp->mmio_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+	if (IS_ERR(ssp->mmio_base))
+		return PTR_ERR(ssp->mmio_base);
+
+	ssp->phys_base = res->start;
+
+	ssp->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(ssp->clk))
+		return PTR_ERR(ssp->clk);
+
+	ssp->irq = platform_get_irq(pdev, 0);
+	if (ssp->irq < 0)
+		return ssp->irq;
+
+	ssp->type = type;
+	ssp->dev = dev;
+
+	status = acpi_dev_uid_to_integer(ACPI_COMPANION(dev), &uid);
+	if (status)
+		ssp->port_id = -1;
+	else
+		ssp->port_id = uid;
+
+	return 0;
+}
+
+static bool pxa2xx_spi_idma_filter(struct dma_chan *chan, void *param)
+{
+	return param == chan->device->dev;
+}
+
+static struct pxa2xx_spi_controller *
+pxa2xx_spi_init_pdata(struct platform_device *pdev)
+{
+	struct pxa2xx_spi_controller *pdata;
+	struct device *dev = &pdev->dev;
+	struct device *parent = dev->parent;
+	const void *match = device_get_match_data(dev);
+	enum pxa_ssp_type type = SSP_UNDEFINED;
+	struct ssp_device *ssp = NULL;
+	bool is_lpss_priv;
+	u32 num_cs = 1;
+	int status;
+
+	ssp = pxa_ssp_request(pdev->id, pdev->name);
+	if (ssp) {
+		type = ssp->type;
+		pxa_ssp_free(ssp);
+	} else if (match) {
+		type = (enum pxa_ssp_type)(uintptr_t)match;
+	} else {
+		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);
+	if (!pdata)
+		return ERR_PTR(-ENOMEM);
+
+	/* Platforms with iDMA 64-bit */
+	is_lpss_priv = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lpss_priv");
+	if (is_lpss_priv) {
+		pdata->tx_param = parent;
+		pdata->rx_param = parent;
+		pdata->dma_filter = pxa2xx_spi_idma_filter;
+	}
+
+	/* Read number of chip select pins, if provided */
+	device_property_read_u32(dev, "num-cs", &num_cs);
+
+	pdata->num_chipselect = num_cs;
+	pdata->is_target = device_property_read_bool(dev, "spi-slave");
+	pdata->enable_dma = true;
+	pdata->dma_burst_size = 1;
+
+	/* If SSP has been already enumerated, use it */
+	if (ssp)
+		return pdata;
+
+	status = pxa2xx_spi_init_ssp(pdev, &pdata->ssp, type);
+	if (status)
+		return ERR_PTR(status);
+
+	return pdata;
+}
+
+static int pxa2xx_spi_platform_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct pxa2xx_spi_controller *platform_info;
+	struct ssp_device *ssp;
+	int status;
+
+	platform_info = dev_get_platdata(dev);
+	if (!platform_info) {
+		platform_info = pxa2xx_spi_init_pdata(pdev);
+		if (IS_ERR(platform_info))
+			return dev_err_probe(dev, PTR_ERR(platform_info), "missing platform data\n");
+
+		dev->platform_data = platform_info;
+
+	}
+
+	ssp = pxa_ssp_request(pdev->id, pdev->name);
+	if (!ssp)
+		ssp = &platform_info->ssp;
+
+	status = pxa2xx_spi_probe(dev, ssp);
+	if (status)
+		pxa_ssp_free(ssp);
+
+	return status;
+}
+
+static void pxa2xx_spi_platform_remove(struct platform_device *pdev)
+{
+	struct driver_data *drv_data = platform_get_drvdata(pdev);
+	struct ssp_device *ssp = drv_data->ssp;
+
+	pxa2xx_spi_remove(&pdev->dev);
+
+	/* Release SSP */
+	pxa_ssp_free(ssp);
+}
+
+static const struct acpi_device_id pxa2xx_spi_acpi_match[] = {
+	{ "80860F0E" },
+	{ "8086228E" },
+	{ "INT33C0" },
+	{ "INT33C1" },
+	{ "INT3430" },
+	{ "INT3431" },
+	{}
+};
+MODULE_DEVICE_TABLE(acpi, pxa2xx_spi_acpi_match);
+
+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",
+		.pm	= pm_ptr(&pxa2xx_spi_pm_ops),
+		.acpi_match_table = pxa2xx_spi_acpi_match,
+		.of_match_table = pxa2xx_spi_of_match,
+	},
+	.probe = pxa2xx_spi_platform_probe,
+	.remove_new = pxa2xx_spi_platform_remove,
+};
+
+static int __init pxa2xx_spi_init(void)
+{
+	return platform_driver_register(&driver);
+}
+subsys_initcall(pxa2xx_spi_init);
+
+static void __exit pxa2xx_spi_exit(void)
+{
+	platform_driver_unregister(&driver);
+}
+module_exit(pxa2xx_spi_exit);
+
+MODULE_AUTHOR("Stephen Street");
+MODULE_DESCRIPTION("PXA2xx SSP SPI Controller platform driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(SPI_PXA2xx);
+MODULE_ALIAS("platform:pxa2xx-spi");
+MODULE_SOFTDEP("pre: dw_dmac");
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index f53827d61a21..046869ea5fb7 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -4,7 +4,6 @@
  * Copyright (C) 2013, 2021 Intel Corporation
  */
 
-#include <linux/acpi.h>
 #include <linux/atomic.h>
 #include <linux/bitops.h>
 #include <linux/bug.h>
@@ -14,15 +13,12 @@
 #include <linux/dmaengine.h>
 #include <linux/err.h>
 #include <linux/gpio/consumer.h>
-#include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/ioport.h>
 #include <linux/math64.h>
 #include <linux/minmax.h>
-#include <linux/mod_devicetable.h>
 #include <linux/module.h>
-#include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/property.h>
 #include <linux/slab.h>
@@ -32,11 +28,6 @@
 
 #include "spi-pxa2xx.h"
 
-MODULE_AUTHOR("Stephen Street");
-MODULE_DESCRIPTION("PXA2xx SSP SPI Controller");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:pxa2xx-spi");
-
 #define TIMOUT_DFLT		1000
 
 /*
@@ -1263,109 +1254,6 @@ static void cleanup(struct spi_device *spi)
 	kfree(chip);
 }
 
-static bool pxa2xx_spi_idma_filter(struct dma_chan *chan, void *param)
-{
-	return param == chan->device->dev;
-}
-
-static int
-pxa2xx_spi_init_ssp(struct platform_device *pdev, struct ssp_device *ssp, enum pxa_ssp_type type)
-{
-	struct device *dev = &pdev->dev;
-	struct resource *res;
-	int status;
-	u64 uid;
-
-	ssp->mmio_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
-	if (IS_ERR(ssp->mmio_base))
-		return PTR_ERR(ssp->mmio_base);
-
-	ssp->phys_base = res->start;
-
-	ssp->clk = devm_clk_get(dev, NULL);
-	if (IS_ERR(ssp->clk))
-		return PTR_ERR(ssp->clk);
-
-	ssp->irq = platform_get_irq(pdev, 0);
-	if (ssp->irq < 0)
-		return ssp->irq;
-
-	ssp->type = type;
-	ssp->dev = dev;
-
-	status = acpi_dev_uid_to_integer(ACPI_COMPANION(dev), &uid);
-	if (status)
-		ssp->port_id = -1;
-	else
-		ssp->port_id = uid;
-
-	return 0;
-}
-
-static struct pxa2xx_spi_controller *
-pxa2xx_spi_init_pdata(struct platform_device *pdev)
-{
-	struct pxa2xx_spi_controller *pdata;
-	struct device *dev = &pdev->dev;
-	struct device *parent = dev->parent;
-	const void *match = device_get_match_data(dev);
-	enum pxa_ssp_type type = SSP_UNDEFINED;
-	struct ssp_device *ssp = NULL;
-	bool is_lpss_priv;
-	u32 num_cs = 1;
-	int status;
-
-	ssp = pxa_ssp_request(pdev->id, pdev->name);
-	if (ssp) {
-		type = ssp->type;
-		pxa_ssp_free(ssp);
-	} else if (match) {
-		type = (enum pxa_ssp_type)(uintptr_t)match;
-	} else {
-		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);
-	if (!pdata)
-		return ERR_PTR(-ENOMEM);
-
-	/* Platforms with iDMA 64-bit */
-	is_lpss_priv = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lpss_priv");
-	if (is_lpss_priv) {
-		pdata->tx_param = parent;
-		pdata->rx_param = parent;
-		pdata->dma_filter = pxa2xx_spi_idma_filter;
-	}
-
-	/* Read number of chip select pins, if provided */
-	device_property_read_u32(dev, "num-cs", &num_cs);
-
-	pdata->num_chipselect = num_cs;
-	pdata->is_target = device_property_read_bool(dev, "spi-slave");
-	pdata->enable_dma = true;
-	pdata->dma_burst_size = 1;
-
-	/* If SSP has been already enumerated, use it */
-	if (ssp)
-		return pdata;
-
-	status = pxa2xx_spi_init_ssp(pdev, &pdata->ssp, type);
-	if (status)
-		return ERR_PTR(status);
-
-	return pdata;
-}
-
 static int pxa2xx_spi_fw_translate_cs(struct spi_controller *controller,
 				      unsigned int cs)
 {
@@ -1391,7 +1279,7 @@ static size_t pxa2xx_spi_max_dma_transfer_size(struct spi_device *spi)
 	return MAX_DMA_LEN;
 }
 
-static int pxa2xx_spi_probe(struct device *dev, struct ssp_device *ssp)
+int pxa2xx_spi_probe(struct device *dev, struct ssp_device *ssp)
 {
 	struct pxa2xx_spi_controller *platform_info;
 	struct spi_controller *controller;
@@ -1597,8 +1485,9 @@ static int pxa2xx_spi_probe(struct device *dev, struct ssp_device *ssp)
 	pxa_ssp_free(ssp);
 	return status;
 }
+EXPORT_SYMBOL_NS_GPL(pxa2xx_spi_probe, SPI_PXA2xx);
 
-static void pxa2xx_spi_remove(struct device *dev)
+void pxa2xx_spi_remove(struct device *dev)
 {
 	struct driver_data *drv_data = dev_get_drvdata(dev);
 	struct ssp_device *ssp = drv_data->ssp;
@@ -1621,6 +1510,7 @@ static void pxa2xx_spi_remove(struct device *dev)
 	/* Release IRQ */
 	free_irq(ssp->irq, drv_data);
 }
+EXPORT_SYMBOL_NS_GPL(pxa2xx_spi_remove, SPI_PXA2xx);
 
 static int pxa2xx_spi_suspend(struct device *dev)
 {
@@ -1672,88 +1562,11 @@ static int pxa2xx_spi_runtime_resume(struct device *dev)
 	return clk_prepare_enable(drv_data->ssp->clk);
 }
 
-static const struct dev_pm_ops pxa2xx_spi_pm_ops = {
+EXPORT_NS_GPL_DEV_PM_OPS(pxa2xx_spi_pm_ops, SPI_PXA2xx) = {
 	SYSTEM_SLEEP_PM_OPS(pxa2xx_spi_suspend, pxa2xx_spi_resume)
 	RUNTIME_PM_OPS(pxa2xx_spi_runtime_suspend, pxa2xx_spi_runtime_resume, NULL)
 };
 
-static int pxa2xx_spi_platform_probe(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	struct pxa2xx_spi_controller *platform_info;
-	struct ssp_device *ssp;
-	int status;
-
-	platform_info = dev_get_platdata(dev);
-	if (!platform_info) {
-		platform_info = pxa2xx_spi_init_pdata(pdev);
-		if (IS_ERR(platform_info))
-			return dev_err_probe(dev, PTR_ERR(platform_info), "missing platform data\n");
-
-		dev->platform_data = platform_info;
-
-	}
-
-	ssp = pxa_ssp_request(pdev->id, pdev->name);
-	if (!ssp)
-		ssp = &platform_info->ssp;
-
-	status = pxa2xx_spi_probe(dev, ssp);
-	if (status)
-		pxa_ssp_free(ssp);
-
-	return status;
-}
-
-static void pxa2xx_spi_platform_remove(struct platform_device *pdev)
-{
-	struct driver_data *drv_data = platform_get_drvdata(pdev);
-	struct ssp_device *ssp = drv_data->ssp;
-
-	pxa2xx_spi_remove(&pdev->dev);
-
-	/* Release SSP */
-	pxa_ssp_free(ssp);
-}
-
-static const struct acpi_device_id pxa2xx_spi_acpi_match[] = {
-	{ "80860F0E" },
-	{ "8086228E" },
-	{ "INT33C0" },
-	{ "INT33C1" },
-	{ "INT3430" },
-	{ "INT3431" },
-	{}
-};
-MODULE_DEVICE_TABLE(acpi, pxa2xx_spi_acpi_match);
-
-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",
-		.pm	= pm_ptr(&pxa2xx_spi_pm_ops),
-		.acpi_match_table = pxa2xx_spi_acpi_match,
-		.of_match_table = pxa2xx_spi_of_match,
-	},
-	.probe = pxa2xx_spi_platform_probe,
-	.remove_new = pxa2xx_spi_platform_remove,
-};
-
-static int __init pxa2xx_spi_init(void)
-{
-	return platform_driver_register(&driver);
-}
-subsys_initcall(pxa2xx_spi_init);
-
-static void __exit pxa2xx_spi_exit(void)
-{
-	platform_driver_unregister(&driver);
-}
-module_exit(pxa2xx_spi_exit);
-
-MODULE_SOFTDEP("pre: dw_dmac");
+MODULE_AUTHOR("Stephen Street");
+MODULE_DESCRIPTION("PXA2xx SSP SPI Controller core driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/spi/spi-pxa2xx.h b/drivers/spi/spi-pxa2xx.h
index 93e1e471e1c6..a470d3d634d3 100644
--- a/drivers/spi/spi-pxa2xx.h
+++ b/drivers/spi/spi-pxa2xx.h
@@ -14,6 +14,7 @@
 
 #include <linux/pxa2xx_ssp.h>
 
+struct device;
 struct gpio_desc;
 
 /*
@@ -131,4 +132,9 @@ extern void pxa2xx_spi_dma_stop(struct driver_data *drv_data);
 extern int pxa2xx_spi_dma_setup(struct driver_data *drv_data);
 extern void pxa2xx_spi_dma_release(struct driver_data *drv_data);
 
+int pxa2xx_spi_probe(struct device *dev, struct ssp_device *ssp);
+void pxa2xx_spi_remove(struct device *dev);
+
+extern const struct dev_pm_ops pxa2xx_spi_pm_ops;
+
 #endif /* SPI_PXA2XX_H */
-- 
2.43.0.rc1.1336.g36b5255a03ac

Re: [PATCH v1 09/10] spi: pxa2xx: Move platform driver to a separate file

[Andy Shevchenko]

On Fri, May 17, 2024 at 10:47:43PM +0300, Andy Shevchenko wrote:
> The spi-pxa2xx.c is bloated with a platform driver code while
> pretending to provide a core functionality. Make it real core
> library by splitting out the platform driver to a separate file.

...

> @@ -1597,8 +1485,9 @@ static int pxa2xx_spi_probe(struct device *dev, struct ssp_device *ssp)

>  	pxa_ssp_free(ssp);

Looking at this leftover, namely this patch should remove the above line,
I realised that there is a problem with the original code as well as it may
drop a reference count in pxa/ssp.c before cleaning up other things which
might have unexpected behaviour.

>  	return status;
>  }
> +EXPORT_SYMBOL_NS_GPL(pxa2xx_spi_probe, SPI_PXA2xx);

I will rework this one along with providing a fix for the above mentioned
issue. Meanwhile I will wait for other comments for the rest of the series.

-- 
With Best Regards,
Andy Shevchenko

[PATCH v1 10/10] spi: pxa2xx: Convert PCI driver to use spi-pxa2xx code directly

[Andy Shevchenko]

PCI driver has an additional device layer for enumeration.
Remove that layer and use spi-pxa2xx code directly.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx-pci.c | 39 ++++++++++++------------------------
 1 file changed, 13 insertions(+), 26 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx-pci.c b/drivers/spi/spi-pxa2xx-pci.c
index 6d2efdb0e95f..616d032f1a89 100644
--- a/drivers/spi/spi-pxa2xx-pci.c
+++ b/drivers/spi/spi-pxa2xx-pci.c
@@ -10,8 +10,7 @@
 #include <linux/err.h>
 #include <linux/module.h>
 #include <linux/pci.h>
-#include <linux/platform_device.h>
-#include <linux/property.h>
+#include <linux/pm.h>
 #include <linux/sprintf.h>
 #include <linux/string.h>
 #include <linux/types.h>
@@ -265,10 +264,8 @@ static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
 		const struct pci_device_id *ent)
 {
 	const struct pxa_spi_info *info;
-	struct platform_device_info pi;
 	int ret;
-	struct platform_device *pdev;
-	struct pxa2xx_spi_controller spi_pdata;
+	struct pxa2xx_spi_controller *pdata;
 	struct ssp_device *ssp;
 
 	ret = pcim_enable_device(dev);
@@ -279,15 +276,17 @@ static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
 	if (ret)
 		return ret;
 
-	memset(&spi_pdata, 0, sizeof(spi_pdata));
+	pdata = devm_kzalloc(&dev->dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return -ENOMEM;
 
-	ssp = &spi_pdata.ssp;
+	ssp = &pdata->ssp;
 	ssp->dev = &dev->dev;
 	ssp->phys_base = pci_resource_start(dev, 0);
 	ssp->mmio_base = pcim_iomap_table(dev)[0];
 
 	info = (struct pxa_spi_info *)ent->driver_data;
-	ret = info->setup(dev, &spi_pdata);
+	ret = info->setup(dev, pdata);
 	if (ret)
 		return ret;
 
@@ -298,28 +297,12 @@ static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
 		return ret;
 	ssp->irq = pci_irq_vector(dev, 0);
 
-	memset(&pi, 0, sizeof(pi));
-	pi.fwnode = dev_fwnode(&dev->dev);
-	pi.parent = &dev->dev;
-	pi.name = "pxa2xx-spi";
-	pi.id = ssp->port_id;
-	pi.data = &spi_pdata;
-	pi.size_data = sizeof(spi_pdata);
-
-	pdev = platform_device_register_full(&pi);
-	if (IS_ERR(pdev))
-		return PTR_ERR(pdev);
-
-	pci_set_drvdata(dev, pdev);
-
-	return 0;
+	return pxa2xx_spi_probe(&dev->dev, ssp);
 }
 
 static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
 {
-	struct platform_device *pdev = pci_get_drvdata(dev);
-
-	platform_device_unregister(pdev);
+	pxa2xx_spi_remove(&dev->dev);
 }
 
 static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
@@ -341,6 +324,9 @@ MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
 static struct pci_driver pxa2xx_spi_pci_driver = {
 	.name           = "pxa2xx_spi_pci",
 	.id_table       = pxa2xx_spi_pci_devices,
+	.driver = {
+		.pm	= pm_ptr(&pxa2xx_spi_pm_ops),
+	},
 	.probe          = pxa2xx_spi_pci_probe,
 	.remove         = pxa2xx_spi_pci_remove,
 };
@@ -349,4 +335,5 @@ module_pci_driver(pxa2xx_spi_pci_driver);
 
 MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
 MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS(SPI_PXA2xx);
 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
-- 
2.43.0.rc1.1336.g36b5255a03ac