[PATCH] gpiolib: fix gpio-hog functionality

[Marco Felsch <m.felsch@pengutronix.de>]

This reverts commit 3641d381e63321016e3bf09504852a6b2a2f879b.

Since the of_xlate support the gpio-hog support is broken because the
'gpio' property used to specify the gpio-hog pin does not contain any
phandle. Due to the fact that of_xlate was never implemented the easiest
way to fix the gpio-hog functionality is to revert the commit.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
---
 drivers/gpio/gpiolib.c | 58 ++++++++++++++++++++----------------------
 drivers/of/of_gpio.c   |  5 ++--
 include/gpio.h         |  4 +--
 3 files changed, 30 insertions(+), 37 deletions(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 6ec63b1119..b4a3a4e550 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -444,27 +444,44 @@ static int of_hog_gpio(struct device_node *np, struct gpio_chip *chip,
 		       unsigned int idx)
 {
 	struct device_node *chip_np = chip->dev->of_node;
-	struct of_phandle_args gpiospec;
 	unsigned long flags = 0;
-	u32 gpio_flags;
+	u32 gpio_cells, gpio_num, gpio_flags;
 	int ret, gpio;
 	const char *name = NULL;
 
-	ret = of_parse_phandle_with_args(chip_np, "gpios", "#gpio-cells", idx,
-					&gpiospec);
+	ret = of_property_read_u32(chip_np, "#gpio-cells", &gpio_cells);
 	if (ret)
 		return ret;
 
-	gpio = gpio_of_xlate(chip->dev, &gpiospec, &gpio_flags);
+	/*
+	 * Support for GPIOs that don't have #gpio-cells set to 2 is
+	 * not implemented
+	 */
+	if (WARN_ON(gpio_cells != 2))
+		return -ENOTSUPP;
+
+	ret = of_property_read_u32_index(np, "gpios", idx * gpio_cells,
+					 &gpio_num);
+	if (ret)
+		return ret;
+
+	ret = of_property_read_u32_index(np, "gpios", idx * gpio_cells + 1,
+					 &gpio_flags);
+	if (ret)
+		return ret;
+
+	if (gpio_flags & OF_GPIO_ACTIVE_LOW)
+		flags |= GPIOF_ACTIVE_LOW;
+
+	gpio = gpio_get_num(chip->dev, gpio_num);
 	if (gpio == -EPROBE_DEFER)
 		return gpio;
+
 	if (gpio < 0) {
-		dev_err(chip->dev, "unable to get gpio: %d\n", gpio);
+		dev_err(chip->dev, "unable to get gpio %u\n", gpio_num);
 		return gpio;
 	}
 
-	if (gpio_flags & OF_GPIO_ACTIVE_LOW)
-		flags |= GPIOF_ACTIVE_LOW;
 
 	/*
 	 * Note that, in order to be compatible with Linux, the code
@@ -625,23 +642,6 @@ void gpiochip_remove(struct gpio_chip *chip)
 	list_del(&chip->list);
 }
 
-static int of_gpio_simple_xlate(struct gpio_chip *chip,
-				const struct of_phandle_args *gpiospec,
-				u32 *flags)
-{
-	/*
-	 * Support for GPIOs that don't have #gpio-cells set to 2 is
-	 * not implemented
-	 */
-	if (WARN_ON(gpiospec->args_count != 2))
-		return -ENOTSUPP;
-
-	if (flags)
-		*flags = gpiospec->args[1];
-
-	return chip->base + gpiospec->args[0];
-}
-
 struct gpio_chip *gpio_get_chip_by_dev(struct device *dev)
 {
 	struct gpio_chip *chip;
@@ -654,8 +654,7 @@ struct gpio_chip *gpio_get_chip_by_dev(struct device *dev)
 	return NULL;
 }
 
-int gpio_of_xlate(struct device *dev, struct of_phandle_args *gpiospec,
-		  int *flags)
+int gpio_get_num(struct device *dev, int gpio)
 {
 	struct gpio_chip *chip;
 
@@ -666,10 +665,7 @@ int gpio_of_xlate(struct device *dev, struct of_phandle_args *gpiospec,
 	if (!chip)
 		return -EPROBE_DEFER;
 
-	if (chip->ops->of_xlate)
-		return chip->ops->of_xlate(chip, gpiospec, flags);
-	else
-		return of_gpio_simple_xlate(chip, gpiospec, flags);
+	return chip->base + gpio;
 }
 
 struct gpio_chip *gpio_get_chip(int gpio)
diff --git a/drivers/of/of_gpio.c b/drivers/of/of_gpio.c
index b662563742..5da80e2493 100644
--- a/drivers/of/of_gpio.c
+++ b/drivers/of/of_gpio.c
@@ -62,7 +62,6 @@ int of_get_named_gpio_flags(struct device_node *np, const char *propname,
 {
 	struct of_phandle_args out_args;
 	struct device *dev;
-	int of_flags;
 	int ret;
 
 	ret = of_parse_phandle_with_args(np, propname, "#gpio-cells",
@@ -80,7 +79,7 @@ int of_get_named_gpio_flags(struct device_node *np, const char *propname,
 		return -EPROBE_DEFER;
 	}
 
-	ret = gpio_of_xlate(dev, &out_args, &of_flags);
+	ret = gpio_get_num(dev, out_args.args[0]);
 	if (ret == -EPROBE_DEFER)
 		return ret;
 	if (ret < 0) {
@@ -90,7 +89,7 @@ int of_get_named_gpio_flags(struct device_node *np, const char *propname,
 	}
 
 	if (flags) {
-		*flags = of_flags;
+		*flags = out_args.args[1];
 		of_gpio_flags_quirks(np, propname, flags, index);
 	}
 
diff --git a/include/gpio.h b/include/gpio.h
index 10ac7fd7c4..5f2c16584c 100644
--- a/include/gpio.h
+++ b/include/gpio.h
@@ -177,7 +177,6 @@ struct gpio_ops {
 	int (*get_direction)(struct gpio_chip *chip, unsigned offset);
 	int (*get)(struct gpio_chip *chip, unsigned offset);
 	void (*set)(struct gpio_chip *chip, unsigned offset, int value);
-	int (*of_xlate)(struct gpio_chip *chip, const struct of_phandle_args *gpiospec, u32 *flags);
 };
 
 struct gpio_chip {
@@ -194,8 +193,7 @@ struct gpio_chip {
 int gpiochip_add(struct gpio_chip *chip);
 void gpiochip_remove(struct gpio_chip *chip);
 
-int gpio_of_xlate(struct device *dev, struct of_phandle_args *gpiospec,
-		  int *flags);
+int gpio_get_num(struct device *dev, int gpio);
 struct gpio_chip *gpio_get_chip(int gpio);
 
 #endif /* __GPIO_H */
-- 
2.39.2