of/gpio: export of_gpio_simple_xlate

Allow GPIO drivers to use of_gpio_simple_xlate.  This is useful for the
generic GPIO driver for example where gpio_chip is embedded in
bgpio_chip and doesn't need of_mm_gpio_chip but has a simple 1:1 GPIO
mapping.

Cc: Anton Vorontsov <avorontsov@ru.mvista.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

diff --git a/drivers/of/gpio.c b/drivers/of/gpio.c
index 3007662ac6146d971ec52aa8eb7b9e1f1f6a8ffa..ef0105fa52b14d1280e3fb746387d713cb0d7933 100644 (file)
--- a/drivers/of/gpio.c
+++ b/drivers/of/gpio.c
@@ -127,8 +127,8 @@ EXPORT_SYMBOL(of_gpio_count);
  * gpio chips. This function performs only one sanity check: whether gpio
  * is less than ngpios (that is specified in the gpio_chip).
  */
-static int of_gpio_simple_xlate(struct gpio_chip *gc, struct device_node *np,
-                               const void *gpio_spec, u32 *flags)
+int of_gpio_simple_xlate(struct gpio_chip *gc, struct device_node *np,
+                        const void *gpio_spec, u32 *flags)
 {
        const __be32 *gpio = gpio_spec;
        const u32 n = be32_to_cpup(gpio);
@@ -152,6 +152,7 @@ static int of_gpio_simple_xlate(struct gpio_chip *gc, struct device_node *np,
 
        return n;
 }
+EXPORT_SYMBOL(of_gpio_simple_xlate);
 
 /**
  * of_mm_gpiochip_add - Add memory mapped GPIO chip (bank)

diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h
index aec8025c786a66c24900f1f2e5bdc89c6418c579..52280a2b5e632b1c402b50a99dcbb9891ff83564 100644 (file)
--- a/include/linux/of_gpio.h
+++ b/include/linux/of_gpio.h
@@ -57,6 +57,8 @@ extern int of_mm_gpiochip_add(struct device_node *np,
 extern void of_gpiochip_add(struct gpio_chip *gc);
 extern void of_gpiochip_remove(struct gpio_chip *gc);
 extern struct gpio_chip *of_node_to_gpiochip(struct device_node *np);
+extern int of_gpio_simple_xlate(struct gpio_chip *gc, struct device_node *np,
+                               const void *gpio_spec, u32 *flags);
 
 #else /* CONFIG_OF_GPIO */
 
@@ -72,6 +74,13 @@ static inline unsigned int of_gpio_count(struct device_node *np)
        return 0;
 }
 
+static inline int of_gpio_simple_xlate(struct gpio_chip *gc,
+                                      struct device_node *np,
+                                      const void *gpio_spec, u32 *flags)
+{
+       return -ENOSYS;
+}
+
 static inline void of_gpiochip_add(struct gpio_chip *gc) { }
 static inline void of_gpiochip_remove(struct gpio_chip *gc) { }