On 2024/9/5 01:25, Andrew Lunn wrote:

quoted

+&gmac1 {
+	assigned-clocks = <&cru SCLK_GMAC1_RX_TX>, <&cru SCLK_GMAC1>;
+	assigned-clock-parents = <&cru SCLK_GMAC1_RGMII_SPEED>;
+	assigned-clock-rates = <0>, <125000000>;
+	clock_in_out = "output";
+	phy-handle = <&rgmii_phy1>;
+	phy-mode = "rgmii";
+	phy-supply = <&vcc_3v3>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&gmac1m1_miim
+		     &gmac1m1_tx_bus2
+		     &gmac1m1_rx_bus2
+		     &gmac1m1_rgmii_clk
+		     &gmac1m1_rgmii_bus>;
+	snps,reset-gpio = <&gpio4 RK_PC0 GPIO_ACTIVE_LOW>;
+	snps,reset-active-low;
+	snps,reset-delays-us = <0 20000 100000>;
+	tx_delay = <0x38>;
+	rx_delay = <0x15>;
+	status = "okay";

This has been discussed a few times. You should be using phy-mode
rgmii-id.

arch/arm/boot/dts/rockchip/rk3288-phycore-som.dtsi is i think also a
YT8521SC.

	Andrew

Thanks, I changed phy-mode to rgmii-id and it seems to work fine.

Best regards,
Junhao