ARM: mvebu: add gpio fan support to Armada 370 RD

The Armada 370 RD platform has a GPIO-controlled fan on MPP8, so this
commit adds the relevant hardware description to Armada 370 RD Device
Tree.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lkml.kernel.org/r/1410429419-29820-2-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

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

@@ -50,6 +50,13 @@
 		};
 
 		internal-regs {
+			pinctrl {
+				fan_pins: fan-pins {
+					marvell,pins = "mpp8";
+					marvell,function = "gpio";
+				};
+			};
+
 			serial@12000 {
 				status = "okay";
 			};
@@ -110,6 +117,14 @@
 				};
 			};
 
+			gpio-fan {
+				compatible = "gpio-fan";
+				gpios = <&gpio0 8 GPIO_ACTIVE_HIGH>;
+				gpio-fan,speed-map = <0 0 3000 1>;
+				pinctrl-0 = <&fan_pins>;
+				pinctrl-names = "default";
+			};
+
 			nand@d0000 {
 				status = "okay";
 				num-cs = <1>;