arm64: dts: rockchip: add gmac0 node to rk3568

While both RK3566 and RK3568 feature the gmac1 node, the gmac0
node is exclusive to the RK3568.

Signed-off-by: Michael Riesch <michael.riesch@wolfvision.net>
Link: https://lore.kernel.org/r/20210729093913.8917-2-michael.riesch@wolfvision.net
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3568.dtsi

@@ -22,6 +22,55 @@
 		compatible = "rockchip,rk3568-qos", "syscon";
 		reg = <0x0 0xfe190200 0x0 0x20>;
 	};
+
+	gmac0: ethernet@fe2a0000 {
+		compatible = "rockchip,rk3568-gmac", "snps,dwmac-4.20a";
+		reg = <0x0 0xfe2a0000 0x0 0x10000>;
+		interrupts = <GIC_SPI 27 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 24 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-names = "macirq", "eth_wake_irq";
+		clocks = <&cru SCLK_GMAC0>, <&cru SCLK_GMAC0_RX_TX>,
+			 <&cru SCLK_GMAC0_RX_TX>, <&cru CLK_MAC0_REFOUT>,
+			 <&cru ACLK_GMAC0>, <&cru PCLK_GMAC0>,
+			 <&cru SCLK_GMAC0_RX_TX>, <&cru CLK_GMAC0_PTP_REF>,
+			 <&cru PCLK_XPCS>;
+		clock-names = "stmmaceth", "mac_clk_rx",
+			      "mac_clk_tx", "clk_mac_refout",
+			      "aclk_mac", "pclk_mac",
+			      "clk_mac_speed", "ptp_ref",
+			      "pclk_xpcs";
+		resets = <&cru SRST_A_GMAC0>;
+		reset-names = "stmmaceth";
+		rockchip,grf = <&grf>;
+		snps,axi-config = <&gmac0_stmmac_axi_setup>;
+		snps,mixed-burst;
+		snps,mtl-rx-config = <&gmac0_mtl_rx_setup>;
+		snps,mtl-tx-config = <&gmac0_mtl_tx_setup>;
+		snps,tso;
+		status = "disabled";
+
+		mdio0: mdio {
+			compatible = "snps,dwmac-mdio";
+			#address-cells = <0x1>;
+			#size-cells = <0x0>;
+		};
+
+		gmac0_stmmac_axi_setup: stmmac-axi-config {
+			snps,blen = <0 0 0 0 16 8 4>;
+			snps,rd_osr_lmt = <8>;
+			snps,wr_osr_lmt = <4>;
+		};
+
+		gmac0_mtl_rx_setup: rx-queues-config {
+			snps,rx-queues-to-use = <1>;
+			queue0 {};
+		};
+
+		gmac0_mtl_tx_setup: tx-queues-config {
+			snps,tx-queues-to-use = <1>;
+			queue0 {};
+		};
+	};
 };
 
 &cpu0_opp_table {