ARM: S3C64XX: Add initial support for board specific IRQs

Follow the scheme used for IRQs. By default 16 GPIOs are allocated
for board use.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

arch/arm/mach-s3c64xx/include/mach/gpio.h

@@ -91,6 +91,10 @@ enum s3c_gpio_number {
 #define S3C_GPIO_END		S3C64XX_GPIO_END
 
 /* define the number of gpios we need to the one after the GPQ() range */
-#define ARCH_NR_GPIOS	(S3C64XX_GPQ(S3C64XX_GPIO_Q_NR) + 1)
+#define GPIO_BOARD_START (S3C64XX_GPQ(S3C64XX_GPIO_Q_NR) + 1)
+
+#define BOARD_NR_GPIOS 16
+
+#define ARCH_NR_GPIOS	(GPIO_BOARD_START + BOARD_NR_GPIOS)
 
 #include <asm-generic/gpio.h>