ARM: dts: BCM53573: Describe on-SoC BCM53125 rev 4 switch

BCM53573 family SoC have Ethernet switch connected to the first Ethernet
controller (accessible over MDIO).

Signed-off-by: Rafał Miłecki <[e-mail]>
Signed-off-by: Florian Fainelli <[e-mail]>

arch/arm/boot/dts/bcm53573.dtsi

···
 
 		gmac0: ethernet@5000 {
 			reg = <0x5000 0x1000>;
+
+			mdio {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				switch: switch@1e {
+					compatible = "brcm,bcm53125";
+					reg = <0x1e>;
+
+					status = "disabled";
+
+					/* ports are defined in board DTS */
+					ports {
+						#address-cells = <1>;
+						#size-cells = <0>;
+					};
+				};
+			};
 		};
 
 		gmac1: ethernet@b000 {