pinctrl: cygnus: add initial IOMUX driver support

This adds the initial driver support for the Broadcom Cygnus IOMUX
controller. The Cygnus IOMUX controller supports group based mux
configuration but allows certain pins to be muxed to GPIO individually
Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Tested-by: Dmitry Torokhov <dtor@chromium.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/bcm/Kconfig

@@ -19,3 +19,16 @@ config PINCTRL_BCM2835
 	bool
 	select PINMUX
 	select PINCONF
+
+config PINCTRL_CYGNUS_MUX
+	bool "Broadcom Cygnus IOMUX driver"
+	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
+	select PINMUX
+	select GENERIC_PINCONF
+	default ARCH_BCM_CYGNUS
+	help
+	  Say yes here to enable the Broadcom Cygnus IOMUX driver.
+
+	  The Broadcom Cygnus IOMUX driver supports group based IOMUX
+	  configuration, with the exception that certain individual pins
+	  can be overrided to GPIO function

drivers/pinctrl/bcm/Makefile

 # Broadcom pinctrl support
 
-obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
-obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
+obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o