[ARM] S3C24XX: Add extra GPIOs via Kconfig

Add Kconfig entries to allow more GPIO space to
be specified depending on the machine(s) selected.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

arch/arm/mach-s3c2410/include/mach/gpio.h

@@ -15,4 +15,10 @@
 #define gpio_set_value	__gpio_set_value
 #define gpio_cansleep	__gpio_cansleep
 
+/* some boards require extra gpio capacity to support external
+ * devices that need GPIO.
+ */
+
+#define ARCH_NR_GPIOS	(256 + CONFIG_S3C24XX_GPIO_EXTRA)
+
 #include <asm-generic/gpio.h>

arch/arm/mach-s3c2440/Kconfig

@@ -31,6 +31,7 @@ config MACH_ANUBIS
 	select CPU_S3C2440
 	select PM_SIMTEC if PM
 	select HAVE_PATA_PLATFORM
+	select S3C24XX_GPIO_EXTRA64
 	help
 	  Say Y here if you are using the Simtec Electronics ANUBIS
 	  development system
@@ -39,6 +40,7 @@ config MACH_OSIRIS
 	bool "Simtec IM2440D20 (OSIRIS) module"
 	select CPU_S3C2440
 	select PM_SIMTEC if PM
+	select S3C24XX_GPIO_EXTRA128
 	help
 	  Say Y here if you are using the Simtec IM2440D20 module, also
 	  known as the Osiris.

arch/arm/plat-s3c24xx/Kconfig

@@ -28,6 +28,27 @@ config S3C24XX_PWM
 	  Support for exporting the PWM timer blocks via the pwm device
 	  system.
 
+
+# gpio configurations
+
+config S3C24XX_GPIO_EXTRA
+	int
+	default 128 if S3C24XX_GPIO_EXTRA128
+	default 64 if S3C24XX_GPIO_EXTRA64
+	default 0
+
+config S3C24XX_GPIO_EXTRA64
+	bool
+	help
+	  Add an extra 64 gpio numbers to the available GPIO pool. This is
+	  available for boards that need extra gpios for external devices.
+
+config S3C24XX_GPIO_EXTRA128
+	bool
+	help
+	  Add an extra 128 gpio numbers to the available GPIO pool. This is
+	  available for boards that need extra gpios for external devices.
+
 config PM_SIMTEC
 	bool
 	help