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gpio: Adjust of_xlate API to support multiple GPIO chips

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This patch changes the of_xlate API to make it possible for multiple
gpio_chips to refer to the same device tree node.  This is useful for
banked GPIO controllers that use multiple gpio_chips for a single
device.  With this change the core code will try calling of_xlate on
each gpio_chip that references the device_node and will return the
gpio number for the first one to return 'true'.

Tested-by: Roland Stigge <stigge@antcom.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Grant Likely
2012-05-17 13:54:40 -06:00
parent 09d71ff194
commit 3d0f7cf0f3
5 changed files with 43 additions and 49 deletions
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2
include/asm-generic/gpio.h
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@@ -144,7 +144,7 @@ extern int gpiochip_add(struct gpio_chip *chip);
extern int __must_check gpiochip_remove(struct gpio_chip *chip);
extern struct gpio_chip *gpiochip_find(const void *data,
int (*match)(struct gpio_chip *chip,
const void *data));
void *data));
/* Always use the library code for GPIO management calls,