ARM: SAMSUNG: Add common samsung_gpiolib_to_irq function

This patch adds a common callback for gpio_to_irq() for external and
gpio interrupts for Samsung SoCs.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Ben Dooks <ben-linux@fluff.org>
[kgene.kim@samsung.com: moved samsung_gpiolib_to_irq() for s3c24xx build]
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
diff --git a/arch/arm/plat-s3c24xx/gpiolib.c b/arch/arm/plat-s3c24xx/gpiolib.c
index 4c0896f..243b641 100644
--- a/arch/arm/plat-s3c24xx/gpiolib.c
+++ b/arch/arm/plat-s3c24xx/gpiolib.c
@@ -74,11 +74,6 @@
 	return -EINVAL;
 }
 
-static int s3c24xx_gpiolib_bankg_toirq(struct gpio_chip *chip, unsigned offset)
-{
-	return IRQ_EINT8 + offset;
-}
-
 static struct s3c_gpio_cfg s3c24xx_gpiocfg_banka = {
 	.set_config	= s3c_gpio_setcfg_s3c24xx_a,
 	.get_config	= s3c_gpio_getcfg_s3c24xx_a,
@@ -157,12 +152,13 @@
 	[6] = {
 		.base	= S3C2410_GPGCON,
 		.pm	= __gpio_pm(&s3c_gpio_pm_2bit),
+		.irq_base = IRQ_EINT8,
 		.chip	= {
 			.base			= S3C2410_GPG(0),
 			.owner			= THIS_MODULE,
 			.label			= "GPIOG",
 			.ngpio			= 16,
-			.to_irq			= s3c24xx_gpiolib_bankg_toirq,
+			.to_irq			= samsung_gpiolib_to_irq,
 		},
 	}, {
 		.base	= S3C2410_GPHCON,