arm: mvebu: dt: Add PHY LED support for 370-rd WAN port

The WAN port of the 370-RD has a Marvell PHY, with one LED on
the front panel.y List this LED in the device tree.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -20,6 +20,7 @@
 /dts-v1/;
 #include <dt-bindings/input/input.h>
 #include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/leds/common.h>
 #include <dt-bindings/gpio/gpio.h>
 #include "armada-370.dtsi"
 
@@ -135,6 +136,17 @@ &mdio {
 	pinctrl-names = "default";
 	phy0: ethernet-phy@0 {
 		reg = <0>;
+		leds {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			led@0 {
+				reg = <0>;
+				color = <LED_COLOR_ID_WHITE>;
+				function = LED_FUNCTION_WAN;
+				default-state = "keep";
+			};
+		};
 	};
 
 	switch: switch@10 {