pinctrl: nsp: add gpio-a driver support for Broadcom NSP SoC

This adds the initial support of the Broadcom NSP gpio-a driver.
Signed-off-by: Yendapally Reddy Dhananjaya Reddy <yrdreddy@broadcom.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/bcm/Kconfig

@@ -54,3 +54,20 @@ config PINCTRL_CYGNUS_MUX
 	  The Broadcom Cygnus IOMUX driver supports group based IOMUX
 	  configuration, with the exception that certain individual pins
 	  can be overrided to GPIO function
+
+config PINCTRL_NSP_GPIO
+	bool "Broadcom NSP GPIO (with PINCONF) driver"
+	depends on OF_GPIO && (ARCH_BCM_NSP || COMPILE_TEST)
+	select GPIOLIB_IRQCHIP
+	select PINCONF
+	select GENERIC_PINCONF
+	default ARCH_BCM_NSP
+	help
+	  Say yes here to enable the Broadcom NSP GPIO driver.
+
+	  The Broadcom Northstar Plus SoC ChipcommonA GPIO controller is
+	  supported by this driver.
+
+	  The ChipcommonA GPIO controller support basic PINCONF functions such
+	  as bias pull up, pull down, and drive strength configurations, when
+	  these pins are muxed to GPIO.

drivers/pinctrl/bcm/Makefile

@@ -4,3 +4,4 @@ obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
 obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
 obj-$(CONFIG_PINCTRL_CYGNUS_GPIO)	+= pinctrl-cygnus-gpio.o
 obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
+obj-$(CONFIG_PINCTRL_NSP_GPIO)		+= pinctrl-nsp-gpio.o