gpio: rtd: Add support for Realtek DHC(Digital Home Center) RTD SoCs

This driver enables configuration of GPIO direction, GPIO values, GPIO
debounce settings and handles GPIO interrupts.
Signed-off-by: Tzuyi Chang <tychang@realtek.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

drivers/gpio/Kconfig

@@ -553,6 +553,19 @@ config GPIO_ROCKCHIP
 	help
 	  Say yes here to support GPIO on Rockchip SoCs.
 
+config GPIO_RTD
+	tristate "Realtek DHC GPIO support"
+	depends on ARCH_REALTEK
+	default y
+	select GPIOLIB_IRQCHIP
+	help
+	  This option enables support for GPIOs found on Realtek DHC(Digital
+	  Home Center) SoCs family, including RTD1295, RTD1315E, RTD1319,
+	  RTD1319D, RTD1395, RTD1619 and RTD1619B.
+
+	  Say yes here to support GPIO functionality and GPIO interrupt on
+	  Realtek DHC SoCs.
+
 config GPIO_SAMA5D2_PIOBU
 	tristate "SAMA5D2 PIOBU GPIO support"
 	depends on MFD_SYSCON

drivers/gpio/Makefile

@@ -137,6 +137,7 @@ obj-$(CONFIG_GPIO_RDC321X)		+= gpio-rdc321x.o
 obj-$(CONFIG_GPIO_REALTEK_OTTO)		+= gpio-realtek-otto.o
 obj-$(CONFIG_GPIO_REG)			+= gpio-reg.o
 obj-$(CONFIG_GPIO_ROCKCHIP)	+= gpio-rockchip.o
+obj-$(CONFIG_GPIO_RTD)			+= gpio-rtd.o
 obj-$(CONFIG_ARCH_SA1100)		+= gpio-sa1100.o
 obj-$(CONFIG_GPIO_SAMA5D2_PIOBU)	+= gpio-sama5d2-piobu.o
 obj-$(CONFIG_GPIO_SCH311X)		+= gpio-sch311x.o