arm64: dts: allwinner: a100: Add EMAC support

The Allwinner A100/A133 Ethernet MAC (EMAC) is compatible with the A64
one and needs access to the syscon register for control of the
top-level integration of the unit.

Note that there are two such controllers on the sun50iw10 die, which are
the same unit with a different top-level syscon register offset.

Signed-off-by: Paul Kocialkowski <paulk@sys-base.io>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Link: https://patch.msgid.link/20250707165155.581579-4-paulk@sys-base.io
Signed-off-by: Chen-Yu Tsai <wens@csie.org>

Author: paulkocialkowski

arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi

@@ -420,6 +420,26 @@
 			#size-cells = <0>;
 		};
 
+		emac0: ethernet@5020000 {
+			compatible = "allwinner,sun50i-a100-emac",
+				     "allwinner,sun50i-a64-emac";
+			reg = <0x5020000 0x10000>;
+			interrupts = <GIC_SPI 16 IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-names = "macirq";
+			clocks = <&ccu CLK_BUS_EMAC>;
+			clock-names = "stmmaceth";
+			resets = <&ccu RST_BUS_EMAC>;
+			reset-names = "stmmaceth";
+			syscon = <&syscon>;
+			status = "disabled";
+
+			mdio0: mdio {
+				compatible = "snps,dwmac-mdio";
+				#address-cells = <1>;
+				#size-cells = <0>;
+			};
+		};
+
 		ths: thermal-sensor@5070400 {
 			compatible = "allwinner,sun50i-a100-ths";
 			reg = <0x05070400 0x100>;