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>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h
index aec8025c786a..52280a2b5e63 100644
--- 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) { }