arm64: dts: allwinner: a523: Add EMAC0 ethernet MAC

Add EMAC0 ethernet MAC support which found on A523 variant SoCs,
including the A527/T527 chips. MAC0 is compatible to the A64 chip which
requires an external PHY. This patch only add RGMII pins for now.

Reviewed-by: Andre Przywara <[email protected]>
Tested-by: Corentin LABBE <[email protected]>
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-a523.dtsi

@@ -126,6 +126,16 @@
 			interrupt-controller;
 			#interrupt-cells = <3>;
 
+			rgmii0_pins: rgmii0-pins {
+				pins = "PH0", "PH1", "PH2", "PH3", "PH4",
+				       "PH5", "PH6", "PH7", "PH9", "PH10",
+				       "PH14", "PH15", "PH16", "PH17", "PH18";
+				allwinner,pinmux = <5>;
+				function = "emac0";
+				drive-strength = <40>;
+				bias-disable;
+			};
+
 			mmc0_pins: mmc0-pins {
 				pins = "PF0" ,"PF1", "PF2", "PF3", "PF4", "PF5";
 				allwinner,pinmux = <2>;
@@ -409,6 +419,15 @@
 			#size-cells = <0>;
 		};
 
+		syscon: syscon@3000000 {
+			compatible = "allwinner,sun55i-a523-system-control",
+				     "allwinner,sun50i-a64-system-control";
+			reg = <0x03000000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ranges;
+		};
+
 		gic: interrupt-controller@3400000 {
 			compatible = "arm,gic-v3";
 			#address-cells = <1>;
@@ -521,6 +540,28 @@
 			status = "disabled";
 		};
 
+		emac0: ethernet@4500000 {
+			compatible = "allwinner,sun55i-a523-emac0",
+				     "allwinner,sun50i-a64-emac";
+			reg = <0x04500000 0x10000>;
+			clocks = <&ccu CLK_BUS_EMAC0>;
+			clock-names = "stmmaceth";
+			resets = <&ccu RST_BUS_EMAC0>;
+			reset-names = "stmmaceth";
+			interrupts = <GIC_SPI 46 IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-names = "macirq";
+			pinctrl-names = "default";
+			pinctrl-0 = <&rgmii0_pins>;
+			syscon = <&syscon>;
+			status = "disabled";
+
+			mdio0: mdio {
+				compatible = "snps,dwmac-mdio";
+				#address-cells = <1>;
+				#size-cells = <0>;
+			};
+		};
+
 		r_ccu: clock-controller@7010000 {
 			compatible = "allwinner,sun55i-a523-r-ccu";
 			reg = <0x7010000 0x250>;