pinctrl: SPEAr: Add plgpio driver

Most of SPEAr SoCs, which support pinctrl, can configure & use
pads as gpio. This patch adds plgpio driver for configuring
these pads as gpio.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/spear/Kconfig b/drivers/pinctrl/spear/Kconfig
index 91558791..6f9a1e8 100644
--- a/drivers/pinctrl/spear/Kconfig
+++ b/drivers/pinctrl/spear/Kconfig
@@ -41,4 +41,11 @@
 	depends on MACH_SPEAR1340
 	select PINCTRL_SPEAR
 
+config PINCTRL_SPEAR_PLGPIO
+	bool "SPEAr SoC PLGPIO Controller"
+	depends on GPIOLIB && PINCTRL_SPEAR
+	help
+	  Say yes here to support PLGPIO controller on ST Microelectronics SPEAr
+	  SoCs.
+
 endif