pinctrl: lochnagar: Add support for the Cirrus Logic Lochnagar

Lochnagar is an evaluation and development board for Cirrus
Logic Smart CODEC and Amp devices. It allows the connection of
most Cirrus Logic devices on mini-cards, as well as allowing
connection of various application processor systems to provide a
full evaluation platform. This driver supports the board
controller chip on the Lochnagar board.

Lochnagar provides many pins which can generally be used for an
audio function such as an AIF or a PDM interface, but also as
GPIOs.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/cirrus/Kconfig

+config PINCTRL_LOCHNAGAR
+	tristate "Cirrus Logic Lochnagar pinctrl driver"
+	depends on MFD_LOCHNAGAR
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+	help
+	  This driver supports configuring the GPIO and other pin configuration
+	  of the Cirrus Logic Lochnagar audio development board.
+
 # This is all selected by the Madera MFD driver Kconfig options
 config PINCTRL_MADERA
 	tristate

drivers/pinctrl/cirrus/Makefile

 # Cirrus Logic pinctrl drivers
+obj-$(CONFIG_PINCTRL_LOCHNAGAR)	+= pinctrl-lochnagar.o
+
 pinctrl-madera-objs		:= pinctrl-madera-core.o
 ifeq ($(CONFIG_PINCTRL_CS47L35),y)
 pinctrl-madera-objs		+= pinctrl-cs47l35.o