[Blackfin] arch: Fix BUG gpio_direction_output API is not compatitable with GENERIC_GPIO API interface

signef-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

diff --git a/include/asm-blackfin/gpio.h b/include/asm-blackfin/gpio.h
index 33ce98e..7bba9b1 100644
--- a/include/asm-blackfin/gpio.h
+++ b/include/asm-blackfin/gpio.h
@@ -426,19 +426,19 @@
 * MODIFICATION HISTORY :
 **************************************************************/
 
-int gpio_request(unsigned short, const char *);
-void gpio_free(unsigned short);
+int gpio_request(unsigned, const char *);
+void gpio_free(unsigned);
 
-void gpio_set_value(unsigned short gpio, unsigned short arg);
-unsigned short gpio_get_value(unsigned short gpio);
+void gpio_set_value(unsigned gpio, int arg);
+int gpio_get_value(unsigned gpio);
 
 #ifndef BF548_FAMILY
 #define gpio_get_value(gpio) 		get_gpio_data(gpio)
 #define gpio_set_value(gpio, value)	set_gpio_data(gpio, value)
 #endif
 
-void gpio_direction_input(unsigned short gpio);
-void gpio_direction_output(unsigned short gpio);
+int gpio_direction_input(unsigned gpio);
+int gpio_direction_output(unsigned gpio, int value);
 
 #include <asm-generic/gpio.h>		/* cansleep wrappers */
 #include <asm/irq.h>