ARM: SAMSUNG: Introduce GPIO_SAMSUNG Kconfig entry

This patch adds Kconfig entry that selects whether legacy Samsung GPIO
driver should be built or not. For platforms that support only DT based
boot, the new pinctrl driver is used and so the old one is not needed.

Cc: Grant Likely <grant.likely@linaro.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/Kconfig

@@ -695,6 +695,7 @@ config ARCH_S3C24XX
 	select CLKDEV_LOOKUP
 	select CLKSRC_MMIO
 	select GENERIC_CLOCKEVENTS
+	select GPIO_SAMSUNG
 	select HAVE_CLK
 	select HAVE_S3C2410_I2C if I2C
 	select HAVE_S3C2410_WATCHDOG if WATCHDOG
@@ -718,6 +719,7 @@ config ARCH_S3C64XX
 	select CLKSRC_MMIO
 	select CPU_V6
 	select GENERIC_CLOCKEVENTS
+	select GPIO_SAMSUNG
 	select HAVE_CLK
 	select HAVE_S3C2410_I2C if I2C
 	select HAVE_S3C2410_WATCHDOG if WATCHDOG
@@ -741,6 +743,7 @@ config ARCH_S5P64X0
 	select CLKSRC_MMIO
 	select CPU_V6
 	select GENERIC_CLOCKEVENTS
+	select GPIO_SAMSUNG
 	select HAVE_CLK
 	select HAVE_S3C2410_I2C if I2C
 	select HAVE_S3C2410_WATCHDOG if WATCHDOG
@@ -758,6 +761,7 @@ config ARCH_S5PC100
 	select CLKSRC_MMIO
 	select CPU_V7
 	select GENERIC_CLOCKEVENTS
+	select GPIO_SAMSUNG
 	select HAVE_CLK
 	select HAVE_S3C2410_I2C if I2C
 	select HAVE_S3C2410_WATCHDOG if WATCHDOG
@@ -776,6 +780,7 @@ config ARCH_S5PV210
 	select CLKSRC_MMIO
 	select CPU_V7
 	select GENERIC_CLOCKEVENTS
+	select GPIO_SAMSUNG
 	select HAVE_CLK
 	select HAVE_S3C2410_I2C if I2C
 	select HAVE_S3C2410_WATCHDOG if WATCHDOG
@@ -795,6 +800,7 @@ config ARCH_EXYNOS
 	select COMMON_CLK
 	select CPU_V7
 	select GENERIC_CLOCKEVENTS
+	select GPIO_SAMSUNG
 	select HAVE_CLK
 	select HAVE_S3C2410_I2C if I2C
 	select HAVE_S3C2410_WATCHDOG if WATCHDOG

arch/arm/plat-samsung/include/plat/pm.h

@@ -166,6 +166,7 @@ extern void s3c_pm_check_store(void);
  */
 extern void s3c_pm_configure_extint(void);
 
+#ifdef CONFIG_GPIO_SAMSUNG
 /**
  * samsung_pm_restore_gpios() - restore the state of the gpios after sleep.
  *
@@ -181,6 +182,10 @@ extern void samsung_pm_restore_gpios(void);
  * Save the GPIO states for resotration on resume. See samsung_pm_restore_gpios().
  */
 extern void samsung_pm_save_gpios(void);
+#else
+static inline void samsung_pm_restore_gpios(void) {}
+static inline void samsung_pm_save_gpios(void) {}
+#endif
 
 extern void s3c_pm_save_core(void);
 extern void s3c_pm_restore_core(void);

drivers/gpio/Kconfig

@@ -209,6 +209,13 @@ config GPIO_RCAR
 	help
 	  Say yes here to support GPIO on Renesas R-Car SoCs.
 
+config GPIO_SAMSUNG
+	bool
+	depends on PLAT_SAMSUNG
+	help
+	  Legacy GPIO support. Use only for platforms without support for
+	  pinctrl.
+
 config GPIO_SPEAR_SPICS
 	bool "ST SPEAr13xx SPI Chip Select as GPIO support"
 	depends on PLAT_SPEAR

drivers/gpio/Makefile

@@ -59,7 +59,7 @@ obj-$(CONFIG_GPIO_PXA)		+= gpio-pxa.o
 obj-$(CONFIG_GPIO_RC5T583)	+= gpio-rc5t583.o
 obj-$(CONFIG_GPIO_RDC321X)	+= gpio-rdc321x.o
 obj-$(CONFIG_GPIO_RCAR)		+= gpio-rcar.o
-obj-$(CONFIG_PLAT_SAMSUNG)	+= gpio-samsung.o
+obj-$(CONFIG_GPIO_SAMSUNG)	+= gpio-samsung.o
 obj-$(CONFIG_ARCH_SA1100)	+= gpio-sa1100.o
 obj-$(CONFIG_GPIO_SCH)		+= gpio-sch.o
 obj-$(CONFIG_GPIO_SODAVILLE)	+= gpio-sodaville.o