On Thu, 5 Aug 2021 at 22:28, <rentao.bupt@xxxxxxxxx> wrote: > +&mdio1 { > + status = "okay"; You're enabling this but it looks like it's unused? > +}; > + > +&mdio3 { > + status = "okay"; > + > + ethphy1: ethernet-phy@13 { > + compatible = "ethernet-phy-ieee802.3-c22"; > + reg = <0x0d>; > + }; > +}; > + > +&mac3 { > + status = "okay"; > + phy-mode = "rgmii"; > + phy-handle = <ðphy1>; > + pinctrl-names = "default"; > + pinctrl-0 = <&pinctrl_rgmii4_default>; > +};