OF: pinctrl: MIPS: lantiq: implement lantiq/xway pinctrl support

Implement support for pinctrl on lantiq/xway socs. The IO core found on these
socs has the registers for pinctrl, pinconf and gpio mixed up in the same
register range. As the gpio_chip handling is only a few lines, the driver also
implements the gpio functionality. This obseletes the old gpio driver that was
located in the arch/ folder.

Signed-off-by: John Crispin <blogic@openwrt.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Cc: devicetree-discuss@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org

arch/mips/Kconfig

@@ -241,6 +241,8 @@ config LANTIQ
 	select HAVE_MACH_CLKDEV
 	select CLKDEV_LOOKUP
 	select USE_OF
+	select PINCTRL
+	select PINCTRL_LANTIQ
 
 config LASAT
 	bool "LASAT Networks platforms"

arch/mips/lantiq/Kconfig

@@ -2,6 +2,7 @@ if LANTIQ
 
 config SOC_TYPE_XWAY
 	bool
+	select PINCTRL_XWAY
 	default n
 
 choice

arch/mips/lantiq/xway/Makefile

@@ -1 +1 @@
-obj-y := prom.o sysctrl.o clk.o reset.o gpio.o dma.o gptu.o
+obj-y := prom.o sysctrl.o clk.o reset.o dma.o gptu.o

drivers/pinctrl/Kconfig

@@ -55,6 +55,12 @@ config PINCTRL_IMX6Q
 	help
 	  Say Y here to enable the imx6q pinctrl driver
 
+config PINCTRL_LANTIQ
+	bool
+	depends on LANTIQ
+	select PINMUX
+	select PINCONF
+
 config PINCTRL_PXA3xx
 	bool
 	select PINMUX
@@ -147,6 +153,11 @@ config PINCTRL_COH901
 
 source "drivers/pinctrl/spear/Kconfig"
 
+config PINCTRL_XWAY
+	bool
+	depends on SOC_TYPE_XWAY
+	depends on PINCTRL_LANTIQ
+
 endmenu
 
 endif

drivers/pinctrl/Makefile

@@ -29,5 +29,7 @@ obj-$(CONFIG_PINCTRL_TEGRA20)	+= pinctrl-tegra20.o
 obj-$(CONFIG_PINCTRL_TEGRA30)	+= pinctrl-tegra30.o
 obj-$(CONFIG_PINCTRL_U300)	+= pinctrl-u300.o
 obj-$(CONFIG_PINCTRL_COH901)	+= pinctrl-coh901.o
+obj-$(CONFIG_PINCTRL_XWAY)	+= pinctrl-xway.o
+obj-$(CONFIG_PINCTRL_LANTIQ)	+= pinctrl-lantiq.o
 
 obj-$(CONFIG_PLAT_SPEAR)	+= spear/