pinctrl: Add pincontrol driver for ARTPEC-6 SoC

Add pinctrl driver support for the Axis ARTPEC-6 SoC.
There are only some pins that actually have different
functions available, but all can control bias (pull-up/-down)
and drive strength.

Code originally written by Chris Paterson.
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

MAINTAINERS

@@ -1088,6 +1088,7 @@ L:	linux-arm-kernel@axis.com
 F:	arch/arm/mach-artpec
 F:	arch/arm/boot/dts/artpec6*
 F:	drivers/clk/axis
+F:	drivers/pinctrl/pinctrl-artpec*
 F:	Documentation/devicetree/bindings/pinctrl/axis,artpec6-pinctrl.txt
 
 ARM/ASPEED MACHINE SUPPORT

drivers/pinctrl/Kconfig

@@ -41,6 +41,17 @@ config PINCTRL_ADI2
 	  future processors. This option is selected automatically when specific
 	  machine and arch are selected to build.
 
+config PINCTRL_ARTPEC6
+        bool "Axis ARTPEC-6 pin controller driver"
+        depends on MACH_ARTPEC6
+        select PINMUX
+        select GENERIC_PINCONF
+        help
+          This is the driver for the Axis ARTPEC-6 pin controller. This driver
+          supports pin function multiplexing as well as pin bias and drive
+          strength configuration. Device tree integration instructions can be
+          found in Documentation/devicetree/bindings/pinctrl/axis,artpec6-pinctrl.txt
+
 config PINCTRL_AS3722
 	tristate "Pinctrl and GPIO driver for ams AS3722 PMIC"
 	depends on MFD_AS3722 && GPIOLIB

drivers/pinctrl/Makefile

@@ -8,6 +8,7 @@ obj-$(CONFIG_PINCONF)		+= pinconf.o
 obj-$(CONFIG_OF)		+= devicetree.o
 obj-$(CONFIG_GENERIC_PINCONF)	+= pinconf-generic.o
 obj-$(CONFIG_PINCTRL_ADI2)	+= pinctrl-adi2.o
+obj-$(CONFIG_PINCTRL_ARTPEC6)	+= pinctrl-artpec6.o
 obj-$(CONFIG_PINCTRL_AS3722)	+= pinctrl-as3722.o
 obj-$(CONFIG_PINCTRL_BF54x)	+= pinctrl-adi2-bf54x.o
 obj-$(CONFIG_PINCTRL_BF60x)	+= pinctrl-adi2-bf60x.o