pinctrl: add lpc18xx pinctrl driver

Pinctrl driver for the System Control Unit (SCU) found on NXP
LPC18xx/43xx devices.

Driver uses the generic pinctrl DT bindings for multiplexing
and property settings.

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index aeb5729..53ae816 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -88,6 +88,15 @@
 	select PINMUX
 	select PINCONF
 
+config PINCTRL_LPC18XX
+	bool "NXP LPC18XX/43XX SCU pinctrl driver"
+	depends on OF && (ARCH_LPC18XX || COMPILE_TEST)
+	default ARCH_LPC18XX
+	select PINMUX
+	select GENERIC_PINCONF
+	help
+	  Pinctrl driver for NXP LPC18xx/43xx System Control Unit (SCU).
+
 config PINCTRL_FALCON
 	bool
 	depends on SOC_FALCON