of/gpio: Add new method for getting gpios under different property names

This patch adds a new routine, of_get_named_gpio_flags(), which takes the
property name as a parameter rather than assuming "gpios".

of_get_gpio_flags() is modified to call of_get_named_gpio_flags() with "gpios"
as the property parameter.

Signed-off-by: John Bonesio <bones@secretlab.ca>
[grant.likely: Tidied up whitespace and tweaked kerneldoc comments.]
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 37 insertions, 5 deletions

diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h
index 6598c04dab01..aec8025c786a 100644
--- a/include/linux/of_gpio.h
+++ b/include/linux/of_gpio.h
@@ -46,8 +46,9 @@ 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_gpio_flags(struct device_node *np, int index,
-                             enum of_gpio_flags *flags);
+extern int of_get_named_gpio_flags(struct device_node *np,
+                const char *list_name, int index, enum of_gpio_flags *flags);
+
 extern unsigned int of_gpio_count(struct device_node *np);
 
 extern int of_mm_gpiochip_add(struct device_node *np,
@@ -60,8 +61,8 @@ extern struct gpio_chip *of_node_to_gpiochip(struct device_node *np);
 #else /* CONFIG_OF_GPIO */
 
 /* Drivers may not strictly depend on the GPIO support, so let them link. */
-static inline int of_get_gpio_flags(struct device_node *np, int index,
-                                    enum of_gpio_flags *flags)
+static inline int of_get_named_gpio_flags(struct device_node *np,
+                const char *list_name, int index, enum of_gpio_flags *flags)
 {
         return -ENOSYS;
 }
@@ -77,7 +78,38 @@ static inline void of_gpiochip_remove(struct gpio_chip *gc) { }
 #endif /* CONFIG_OF_GPIO */
 
 /**
- * of_get_gpio - Get a GPIO number to use with GPIO API
+ * of_get_gpio_flags() - Get a GPIO number 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
+ * value on the error condition. If @flags is not NULL the function also fills
+ * in flags for the GPIO.
+ */
+static inline int of_get_gpio_flags(struct device_node *np, int index,
+                      enum of_gpio_flags *flags)
+{
+        return of_get_named_gpio_flags(np, "gpios", index, flags);
+}
+
+/**
+ * of_get_named_gpio() - Get a GPIO number to use with GPIO API
+ * @np:         device node to get GPIO from
+ * @propname:   Name of property containing gpio specifier(s)
+ * @index:      index of the GPIO
+ *
+ * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
+ * value on the error condition.
+ */
+static inline int of_get_named_gpio(struct device_node *np,
+                                   const char *propname, int index)
+{
+        return of_get_named_gpio_flags(np, propname, index, NULL);
+}
+
+/**
+ * of_get_gpio() - Get a GPIO number to use with GPIO API
  * @np:         device node to get GPIO from
  * @index:      index of the GPIO
  *