[RFC v4 3/8] gpio: generic: add DT support for generic memory-mapped GPIOs

[Christian Lamparter <chunkeey@xxxxxxxxxxxxxx>]

From: Álvaro Fernández Rojas <noltari@xxxxxxxxx>

This patch adds support for defining memory-mapped GPIOs
which provide a compatible interface for the existing
generic-gpio driver.

Signed-off-by: Álvaro Fernández Rojas <noltari@xxxxxxxxx>
Signed-off-by: Christian Lamparter <chunkeey@xxxxxxxxxxxxxx>
---
 drivers/gpio/Kconfig            |  3 ++
 drivers/gpio/gpio-mmio-compat.h | 17 ++++++++
 drivers/gpio/gpio-mmio.c        | 95 ++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 113 insertions(+), 2 deletions(-)
 create mode 100644 drivers/gpio/gpio-mmio-compat.h

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index f73f26b..d1f124e 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -212,6 +212,9 @@ config GPIO_GENERIC_PLATFORM
 	help
 	  Say yes here to support basic platform_device memory-mapped GPIO controllers.
 
+if GPIO_GENERIC_PLATFORM
+endif
+
 config GPIO_GRGPIO
 	tristate "Aeroflex Gaisler GRGPIO support"
 	depends on OF
diff --git a/drivers/gpio/gpio-mmio-compat.h b/drivers/gpio/gpio-mmio-compat.h
new file mode 100644
index 0000000..73c48bc
--- /dev/null
+++ b/drivers/gpio/gpio-mmio-compat.h
@@ -0,0 +1,17 @@
+#ifndef GPIO_MMIO_COMPAT_H
+#define GPIO_MMIO_COMPAT_H
+
+#include <linux/ioport.h>
+
+#define ADD(_name, _func) { .compatible = _name, .data = _func }
+
+#undef ADD
+
+static inline void set_resource_address(struct resource *res,
+					resource_size_t start,
+					resource_size_t len)
+{
+	res->start = start;
+	res->end = start + len - 1;
+}
+#endif /* GPIO_MMIO_COMPAT_H */
diff --git a/drivers/gpio/gpio-mmio.c b/drivers/gpio/gpio-mmio.c
index 6c1cb3b..4de9846 100644
--- a/drivers/gpio/gpio-mmio.c
+++ b/drivers/gpio/gpio-mmio.c
@@ -61,6 +61,9 @@ o        `                     ~~~~\___/~~~~    ` controller in FPGA is ,.`
 #include <linux/bitops.h>
 #include <linux/platform_device.h>
 #include <linux/mod_devicetable.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include "gpio-mmio-compat.h"
 
 static void bgpio_write8(void __iomem *reg, unsigned long data)
 {
@@ -569,6 +572,83 @@ static void __iomem *bgpio_map(struct platform_device *pdev,
 	return devm_ioremap_resource(&pdev->dev, r);
 }
 
+#ifdef CONFIG_OF
+static int bgpio_basic_mmio_parse_dt(struct platform_device *pdev,
+				     struct bgpio_pdata *pdata,
+				     unsigned long *flags)
+{
+	struct device *dev = &pdev->dev;
+	int err;
+
+	err = of_property_read_u32(dev->of_node, "ngpio", &pdata->ngpio);
+	if (err && err != -EINVAL)
+		return err;
+
+	if (of_device_is_big_endian(dev->of_node))
+		*flags |= BGPIOF_BIG_ENDIAN_BYTE_ORDER;
+
+	if (of_property_read_bool(dev->of_node, "unreadable-reg-set"))
+		*flags |= BGPIOF_UNREADABLE_REG_SET;
+
+	if (of_property_read_bool(dev->of_node, "unreadable-reg-dir"))
+		*flags |= BGPIOF_UNREADABLE_REG_DIR;
+
+	if (of_property_read_bool(dev->of_node, "big-endian-byte-order"))
+		*flags |= BGPIOF_BIG_ENDIAN;
+
+	if (of_property_read_bool(dev->of_node, "read-output-reg-set"))
+		*flags |= BGPIOF_READ_OUTPUT_REG_SET;
+
+	if (of_property_read_bool(dev->of_node, "no-output"))
+		*flags |= BGPIOF_NO_OUTPUT;
+	return 0;
+}
+
+#define ADD(_name, _func) { .compatible = _name, .data = _func }
+
+static const struct of_device_id bgpio_of_match[] = {
+	ADD("linux,gpio-mmio", bgpio_basic_mmio_parse_dt),
+
+	{ }
+};
+#undef ADD
+MODULE_DEVICE_TABLE(of, bgpio_of_match);
+
+static struct bgpio_pdata *bgpio_parse_dt(struct platform_device *pdev,
+					  unsigned long *flags)
+{
+	int (*parse_dt)(struct platform_device *,
+			struct bgpio_pdata *, unsigned long *);
+	const struct device_node *node = pdev->dev.of_node;
+	const struct of_device_id *of_id;
+	struct bgpio_pdata *pdata;
+	int err = -ENODEV;
+
+	of_id = of_match_node(bgpio_of_match, node);
+	if (!of_id)
+		return NULL;
+
+	pdata = devm_kzalloc(&pdev->dev, sizeof(struct bgpio_pdata),
+			     GFP_KERNEL);
+	if (!pdata)
+		return ERR_PTR(-ENOMEM);
+
+	parse_dt = of_id->data;
+	if (parse_dt)
+		err = parse_dt(pdev, pdata, flags);
+	if (err)
+		return ERR_PTR(err);
+
+	return pdata;
+}
+#else
+static struct bgpio_pdata *bgpio_parse_dt(struct platform_device *pdev,
+					  unsigned long *flags)
+{
+	return NULL;
+}
+#endif /* CONFIG_OF */
+
 static int bgpio_pdev_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -579,10 +659,18 @@ static int bgpio_pdev_probe(struct platform_device *pdev)
 	void __iomem *dirout;
 	void __iomem *dirin;
 	unsigned long sz;
-	unsigned long flags = pdev->id_entry->driver_data;
+	unsigned long flags = 0;
 	int err;
 	struct gpio_chip *gc;
-	struct bgpio_pdata *pdata = dev_get_platdata(dev);
+	struct bgpio_pdata *pdata;
+
+	pdata = bgpio_parse_dt(pdev, &flags);
+	if (IS_ERR(pdata)) {
+		return PTR_ERR(pdata);
+	} else if (!pdata) {
+		pdata = dev_get_platdata(dev);
+		flags = pdev->id_entry->driver_data;
+	}
 
 	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dat");
 	if (!r)
@@ -646,6 +734,9 @@ MODULE_DEVICE_TABLE(platform, bgpio_id_table);
 static struct platform_driver bgpio_driver = {
 	.driver = {
 		.name = "basic-mmio-gpio",
+#ifdef CONFIG_OF
+		.of_match_table = of_match_ptr(bgpio_of_match),
+#endif
 	},
 	.id_table = bgpio_id_table,
 	.probe = bgpio_pdev_probe,
-- 
2.8.1

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