pinctrl: add pinctrl-mxs support

Add pinctrl support for Freescale MXS SoCs, i.MX23 and i.MX28.
The driver supports device tree probe only.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 40d78aa..73f2fd6 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -49,6 +49,21 @@
 	select PINCTRL_PXA3xx
 	select PINCONF
 
+config PINCTRL_MXS
+	bool
+
+config PINCTRL_IMX23
+	bool
+	select PINMUX
+	select PINCONF
+	select PINCTRL_MXS
+
+config PINCTRL_IMX28
+	bool
+	select PINMUX
+	select PINCONF
+	select PINCTRL_MXS
+
 config PINCTRL_PXA168
 	bool "PXA168 pin controller driver"
 	depends on ARCH_MMP