of/gpio: add default of_xlate function if device has a node pointer

Implement generic OF gpio hooks and thus make device-enabled GPIO chips
(i.e.  the ones that have gpio_chip->dev specified) automatically attach
to the OpenFirmware subsystem.  Which means that now we can handle I2C and
SPI GPIO chips almost* transparently.

* "Almost" because some chips still require platform data, and for these
  chips OF-glue is still needed, though with this change the glue will
  be much smaller.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Bill Gatliff <bgat@billgatliff.com>
Cc: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
CC: linux-kernel@vger.kernel.org
CC: devicetree-discuss@lists.ozlabs.org

1 files changed, 5 insertions, 2 deletions

diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h
index 1020587efed1..6598c04dab01 100644
--- a/include/linux/of_gpio.h
+++ b/include/linux/of_gpio.h
@@ -52,9 +52,9 @@ extern unsigned int of_gpio_count(struct device_node *np);
 
 extern int of_mm_gpiochip_add(struct device_node *np,
                               struct of_mm_gpio_chip *mm_gc);
-extern int of_gpio_simple_xlate(struct gpio_chip *gc, struct device_node *np,
-                                const void *gpio_spec, u32 *flags);
 
+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);
 
 #else /* CONFIG_OF_GPIO */
@@ -71,6 +71,9 @@ static inline unsigned int of_gpio_count(struct device_node *np)
         return 0;
 }
 
+static inline void of_gpiochip_add(struct gpio_chip *gc) { }
+static inline void of_gpiochip_remove(struct gpio_chip *gc) { }
+
 #endif /* CONFIG_OF_GPIO */
 
 /**