ARM: dts: sunxi: h3/h5: represent the mdio switch used by sun8i-h3-emac

Since dwmac-sun8i could use either an integrated PHY or an external PHY
(which could be at same MDIO address), we need to represent this selection
by a MDIO switch.
Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sunxi-h3-h5.dtsi

@@ -413,6 +413,22 @@ emac: ethernet@1c30000 {
 			mdio: mdio {
 				#address-cells = <1>;
 				#size-cells = <0>;
+				compatible = "snps,dwmac-mdio";
+			};
+
+			mdio-mux {
+				compatible = "allwinner,sun8i-h3-mdio-mux";
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				mdio-parent-bus = <&mdio>;
+				/* Only one MDIO is usable at the time */
+				internal_mdio: mdio@1 {
+					compatible = "allwinner,sun8i-h3-mdio-internal";
+					reg = <1>;
+					#address-cells = <1>;
+					#size-cells = <0>;
+
 					int_mii_phy: ethernet-phy@1 {
 						compatible = "ethernet-phy-ieee802.3-c22";
 						reg = <1>;
@@ -420,6 +436,13 @@ int_mii_phy: ethernet-phy@1 {
 						resets = <&ccu RST_BUS_EPHY>;
 					};
 				};
+
+				external_mdio: mdio@2 {
+					reg = <2>;
+					#address-cells = <1>;
+					#size-cells = <0>;
+				};
+			};
 		};
 
 		spi0: spi@1c68000 {