RK3399可以使用LAN8720A作phy吗

[复制链接] · 发表于 2021-3-12 15:15:14

RK3399可以使用LAN8720A作phy吗，想用rk3399输出50M的CLK给phy,配置了设备树,但用示波器测试未发现有clk输出 clkin_gmac: external-gmac-clock {
            compatible = "fixed-clock";
            //clock-frequency = <125000000>;
            clock-frequency = <50000000>;
            clock-output-names = "clkin_gmac";
            #clock-cells = <0>;
      };

gmac {
      phy-supply = <&vcc_lan>;
      //phy-mode = "rgmii";
      //clock_in_out = "input";
      phy-mode = "rmii";
      clock_in_out = "output";
      snps,reset-gpio = <&gpio3 15 GPIO_ACTIVE_LOW>;
      snps,reset-active-low;
      snps,reset-delays-us = <0 50000 1000000>;
   assigned-clocks = <&cru SCLK_RMII_SRC>;
   assigned-clock-parents = <&clkin_gmac>;
      pinctrl-names = "default";
      pinctrl-0 = <&rmii_pins>;
      tx_delay = <0x30>;
      rx_delay = <0x11>;
      status = "okay";
};