riscv: dts: sophgo: Add ethernet device for cv18xx

Add ethernet controller device node for cv18xx SoC.

Link: https://lore.kernel.org/r/20250703021600.125550-2-inochiama@gmail.com
Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
Signed-off-by: Chen Wang <wangchen20@iscas.ac.cn>

Author: inochisa

arch/riscv/boot/dts/sophgo/cv180x.dtsi

@@ -189,6 +189,50 @@
 			status = "disabled";
 		};
 
+		gmac0: ethernet@4070000 {
+			compatible = "sophgo,cv1800b-dwmac", "snps,dwmac-3.70a";
+			reg = <0x04070000 0x10000>;
+			clocks = <&clk CLK_AXI4_ETH0>, <&clk CLK_ETH0_500M>;
+			clock-names = "stmmaceth", "ptp_ref";
+			interrupts = <SOC_PERIPHERAL_IRQ(15) IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-names = "macirq";
+			resets = <&rst RST_ETH0>;
+			reset-names = "stmmaceth";
+			rx-fifo-depth = <8192>;
+			tx-fifo-depth = <8192>;
+			snps,multicast-filter-bins = <0>;
+			snps,perfect-filter-entries = <1>;
+			snps,aal;
+			snps,txpbl = <8>;
+			snps,rxpbl = <8>;
+			snps,mtl-rx-config = <&gmac0_mtl_rx_setup>;
+			snps,mtl-tx-config = <&gmac0_mtl_tx_setup>;
+			snps,axi-config = <&gmac0_stmmac_axi_setup>;
+			status = "disabled";
+
+			gmac0_mdio: mdio {
+				compatible = "snps,dwmac-mdio";
+				#address-cells = <1>;
+				#size-cells = <0>;
+			};
+
+			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 {};
+			};
+
+			gmac0_stmmac_axi_setup: stmmac-axi-config {
+				snps,blen = <16 8 4 0 0 0 0>;
+				snps,rd_osr_lmt = <2>;
+				snps,wr_osr_lmt = <1>;
+			};
+		};
+
 		uart0: serial@4140000 {
 			compatible = "snps,dw-apb-uart";
 			reg = <0x04140000 0x100>;