ARM: mvebu: add user LED support of Armada 370 RD

The Armada 370 RD has a GPIO controlled LED connected on MPP32, so
this commit adds the relevant hardware description to Armada 370 RD
Device Tree.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: NAndrew Lunn <andrew@lunn.ch>
Link: https://lkml.kernel.org/r/1410429419-29820-3-git-send-email-thomas.petazzoni@free-electrons.comSigned-off-by: NJason Cooper <jason@lakedaemon.net>

arch/arm/boot/dts/armada-370-rd.dts

@@ -55,6 +55,11 @@
 					marvell,pins = "mpp8";
 					marvell,function = "gpio";
 				};
+
+				led_pins: led-pins {
+					marvell,pins = "mpp32";
+					marvell,function = "gpio";
+				};
 			};
 
 			serial@12000 {
@@ -125,6 +130,18 @@
 				pinctrl-names = "default";
 			};
 
+			gpio_leds {
+				compatible = "gpio-leds";
+				pinctrl-names = "default";
+				pinctrl-0 = <&led_pins>;
+
+				sw_led {
+					label = "370rd:green:sw";
+					gpios = <&gpio1 0 GPIO_ACTIVE_LOW>;
+					default-state = "keep";
+				};
+			};
+
 			nand@d0000 {
 				status = "okay";
 				num-cs = <1>;