gpio: Add support for RDC321x GPIO controller

This patch adds a new GPIO driver for the RDC321x SoC GPIO controller.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 4fd0f27..56eb0c5 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -282,6 +282,14 @@
 	---help---
 	Add support for the GPIO IP in the timberdale FPGA.
 
+config GPIO_RDC321X
+	tristate "RDC R-321x GPIO support"
+	depends on PCI && GPIOLIB
+	select MFD_RDC321X
+	help
+	  Support for the RDC R321x SoC GPIOs over southbridge
+	  PCI configuration space.
+
 comment "SPI GPIO expanders:"
 
 config GPIO_MAX7301