gpio: Add MOXA ART GPIO driver

Add GPIO driver for MOXA ART SoCs.

Signed-off-by: Jonas Jensen <jonas.jensen@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/Kconfig

@@ -156,6 +156,13 @@ config GPIO_F7188X
 	  To compile this driver as a module, choose M here: the module will
 	  be called f7188x-gpio.
 
+config GPIO_MOXART
+	bool "MOXART GPIO support"
+	depends on ARCH_MOXART
+	help
+	  Select this option to enable GPIO driver for
+	  MOXA ART SoC devices.
+
 config GPIO_MPC5200
 	def_bool y
 	depends on PPC_MPC52xx