ARM: dts: armada-xp-linksys-mamba: Utilize new DSA binding

Utilize the new DSA binding, introduced with commit 8c5ad1d6 ("net: dsa:
Document new binding"). The legacy binding node is kept included, but is marked
disabled.
Tested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm/boot/dts/armada-xp-linksys-mamba.dts

@@ -302,6 +302,8 @@ gpio_fan {
 	};
 
 	dsa {
+		status = "disabled";
+
 		compatible = "marvell,dsa";
 		#address-cells = <2>;
 		#size-cells = <0>;
@@ -398,3 +400,54 @@ spi-flash@0 {
 		spi-max-frequency = <40000000>;
 	};
 };
+
+&mdio {
+	status = "okay";
+
+	switch@0 {
+		compatible = "marvell,mv88e6085";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		reg = <0>;
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+				label = "lan4";
+			};
+
+			port@1 {
+				reg = <1>;
+				label = "lan3";
+			};
+
+			port@2 {
+				reg = <2>;
+				label = "lan2";
+			};
+
+			port@3 {
+				reg = <3>;
+				label = "lan1";
+			};
+
+			port@4 {
+				reg = <4>;
+				label = "internet";
+			};
+
+			port@5 {
+				reg = <5>;
+				label = "cpu";
+				ethernet = <&eth0>;
+				fixed-link {
+					speed = <1000>;
+					full-duplex;
+				};
+			};
+		};
+	};
+};