[PATCH] gpio: fix build errors for drivers not strictly requiring GPIOs

[Anton Vorontsov <avorontsov@ru.mvista.com>]

Since commit 7560fa60fcdcdb0da662f6a9fad9064b554ef46c (gpio: <linux/gpio.h>
and "no GPIO support here" stubs) drivers can use GPIOs if they're available,
but don't require them.

This patch actually enables this feature, otherwise drivers will stumble
against this:

include/asm-generic/gpio.h:111: error: redefinition of 'gpio_is_valid'
include/linux/gpio.h:21: error: previous definition of 'gpio_is_valid' was here
include/asm-generic/gpio.h:121: error: redefinition of 'gpio_cansleep'
include/linux/gpio.h:60: error: previous definition of 'gpio_cansleep' was here
include/asm-generic/gpio.h:126: error: redefinition of 'gpio_get_value_cansleep'
include/linux/gpio.h:67: error: previous definition of 'gpio_get_value_cansleep' was here
include/asm-generic/gpio.h:132: error: redefinition of 'gpio_set_value_cansleep'
include/linux/gpio.h:74: error: previous definition of 'gpio_set_value_cansleep' was here

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
---
 include/asm-generic/gpio.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index 9c03b71..c9bcbd6 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -105,7 +105,7 @@ extern void __gpio_set_value(unsigned gpio, int value);
 extern int __gpio_cansleep(unsigned gpio);
 
 
-#else
+#elif defined(CONFIG_GENERIC_GPIO)
 
 static inline int gpio_is_valid(int number)
 {
-- 
1.5.5.1