arm64: dts: allwinner: t527: add EMAC0 to Avaota-A1 board

On Avaota A1 board, the EMAC0 connect to an external RTL8211F-CG PHY,
which features a 25MHz crystal, and using PH8 pin as PHY reset.

Signed-off-by: Yixun Lan <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Chen-Yu Tsai <[email protected]>

Author: dlan17

arch/arm64/boot/dts/allwinner/sun55i-t527-avaota-a1.dts

@@ -12,6 +12,7 @@
 	compatible = "yuzukihd,avaota-a1", "allwinner,sun55i-t527";
 
 	aliases {
+		ethernet0 = &emac0;
 		serial0 = &uart0;
 	};
 
@@ -64,6 +65,24 @@
 	status = "okay";
 };
 
+&emac0 {
+	phy-mode = "rgmii-id";
+	phy-handle = <&ext_rgmii_phy>;
+	phy-supply = <&reg_dcdc4>;
+
+	allwinner,tx-delay-ps = <100>;
+	allwinner,rx-delay-ps = <300>;
+
+	status = "okay";
+};
+
+&mdio0 {
+	ext_rgmii_phy: ethernet-phy@1 {
+		compatible = "ethernet-phy-ieee802.3-c22";
+		reg = <1>;
+	};
+};
+
 &mmc0 {
 	vmmc-supply = <&reg_cldo3>;
 	cd-gpios = <&pio 5 6 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>; /* PF6 */