arm64: dts: marvell: Add ethernet switch definition for the ESPRESSObin

This defines and enables the Marvell ethernet switch MVE886341 on the
Marvell ESPRESSObin board.

Signed-off-by: Romain Perier <romain.perier@free-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm64/boot/dts/marvell/armada-3720-espressobin.dts

@@ -80,3 +80,69 @@
 &usb3 {
 	status = "okay";
 };
+
+&mdio {
+	switch0: switch0@1 {
+		compatible = "marvell,mv88e6085";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		reg = <1>;
+
+		dsa,member = <0 0>;
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+				label = "cpu";
+				ethernet = <&eth0>;
+			};
+
+			port@1 {
+				reg = <1>;
+				label = "wan";
+				phy-handle = <&switch0phy0>;
+			};
+
+			port@2 {
+				reg = <2>;
+				label = "lan0";
+				phy-handle = <&switch0phy1>;
+			};
+
+			port@3 {
+				reg = <3>;
+				label = "lan1";
+				phy-handle = <&switch0phy2>;
+			};
+
+		};
+
+		mdio {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			switch0phy0: switch0phy0@11 {
+				reg = <0x11>;
+			};
+			switch0phy1: switch0phy1@12 {
+				reg = <0x12>;
+			};
+			switch0phy2: switch0phy2@13 {
+				reg = <0x13>;
+			};
+		};
+	};
+};
+
+&eth0 {
+	phy-mode = "rgmii-id";
+	status = "okay";
+
+	fixed-link {
+		speed = <1000>;
+		full-duplex;
+	};
+};