dt-bindings: pinctrl: uniphier: add UniPhier pinctrl binding

The driver has been in the tree for a while, but its binding document
is missing.  Hence, here it is.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/socionext,uniphier-pinctrl.txt

+UniPhier SoCs pin controller
+
+Required properties:
+- compatible: should be one of the following:
+    "socionext,uniphier-ld4-pinctrl"  - for LD4 SoC
+    "socionext,uniphier-pro4-pinctrl" - for Pro4 SoC
+    "socionext,uniphier-sld8-pinctrl" - for sLD8 SoC
+    "socionext,uniphier-pro5-pinctrl" - for Pro5 SoC
+    "socionext,uniphier-pxs2-pinctrl" - for PXs2 SoC
+    "socionext,uniphier-ld6b-pinctrl" - for LD6b SoC
+    "socionext,uniphier-ld11-pinctrl" - for LD11 SoC
+    "socionext,uniphier-ld20-pinctrl" - for LD20 SoC
+    "socionext,uniphier-pxs3-pinctrl" - for PXs3 SoC
+
+Note:
+The UniPhier pinctrl should be a subnode of a "syscon" compatible node.
+
+Example:
+	soc-glue@5f800000 {
+		compatible = "socionext,uniphier-pro4-soc-glue",
+			     "simple-mfd", "syscon";
+		reg = <0x5f800000 0x2000>;
+
+		pinctrl: pinctrl {
+			compatible = "socionext,uniphier-pro4-pinctrl";
+		};
+	};

MAINTAINERS

@@ -2042,6 +2042,7 @@ L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-uniphier.git
 S:	Maintained
 F:	Documentation/devicetree/bindings/gpio/gpio-uniphier.txt
+F:	Documentation/devicetree/bindings/pinctrl/socionext,uniphier-pinctrl.txt
 F:	arch/arm/boot/dts/uniphier*
 F:	arch/arm/include/asm/hardware/cache-uniphier.h
 F:	arch/arm/mach-uniphier/