gpiolib: port of_ functions to use gpiod

Refactor the of_ functions of gpiolib to use the now public gpiod
interface, and export of_get_named_gpiod_flags() and
of_get_gpiod_flags() functions.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 24 insertions, 5 deletions

diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h
index a83dc6f5008e..d71f2cc141ae 100644
--- a/include/linux/of_gpio.h
+++ b/include/linux/of_gpio.h
@@ -21,6 +21,7 @@
 #include <linux/of.h>
 
 struct device_node;
+struct gpio_desc;
 
 /*
  * This is Linux-specific flags. By default controllers' and Linux' mapping
@@ -47,7 +48,7 @@ static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc)
         return container_of(gc, struct of_mm_gpio_chip, gc);
 }
 
-extern int of_get_named_gpio_flags(struct device_node *np,
+extern struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
                 const char *list_name, int index, enum of_gpio_flags *flags);
 
 extern int of_mm_gpiochip_add(struct device_node *np,
@@ -62,10 +63,10 @@ extern int of_gpio_simple_xlate(struct gpio_chip *gc,
 #else /* CONFIG_OF_GPIO */
 
 /* Drivers may not strictly depend on the GPIO support, so let them link. */
-static inline int of_get_named_gpio_flags(struct device_node *np,
+static inline struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
                 const char *list_name, int index, enum of_gpio_flags *flags)
 {
-        return -ENOSYS;
+        return ERR_PTR(-ENOSYS);
 }
 
 static inline int of_gpio_simple_xlate(struct gpio_chip *gc,
@@ -80,6 +81,18 @@ static inline void of_gpiochip_remove(struct gpio_chip *gc) { }
 
 #endif /* CONFIG_OF_GPIO */
 
+static inline int of_get_named_gpio_flags(struct device_node *np,
+                const char *list_name, int index, enum of_gpio_flags *flags)
+{
+        struct gpio_desc *desc;
+        desc = of_get_named_gpiod_flags(np, list_name, index, flags);
+
+        if (IS_ERR(desc))
+                return PTR_ERR(desc);
+        else
+                return desc_to_gpio(desc);
+}
+
 /**
  * of_gpio_named_count() - Count GPIOs for a device
  * @np:         device node to count GPIOs for
@@ -117,15 +130,21 @@ static inline int of_gpio_count(struct device_node *np)
 }
 
 /**
- * of_get_gpio_flags() - Get a GPIO number and flags to use with GPIO API
+ * of_get_gpiod_flags() - Get a GPIO descriptor and flags to use with GPIO API
  * @np:         device node to get GPIO from
  * @index:      index of the GPIO
  * @flags:      a flags pointer to fill in
  *
- * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
+ * Returns GPIO descriptor to use with Linux generic GPIO API, or a errno
  * value on the error condition. If @flags is not NULL the function also fills
  * in flags for the GPIO.
  */
+static inline struct gpio_desc *of_get_gpiod_flags(struct device_node *np,
+                                        int index, enum of_gpio_flags *flags)
+{
+        return of_get_named_gpiod_flags(np, "gpios", index, flags);
+}
+
 static inline int of_get_gpio_flags(struct device_node *np, int index,
                       enum of_gpio_flags *flags)
 {