* ENETC ethernet device tree bindings Depending on board design and ENETC port type (internal or external) there are two supported link modes specified by below device tree bindings. Required properties: - reg : Specifies PCIe Device Number and Function Number of the ENETC endpoint device, according to parent node bindings. - compatible : Should be "fsl,enetc". 1. The ENETC external port is connected to a MDIO configurable phy 1.1. Using the local ENETC Port MDIO interface In this case, the ENETC node should include a "mdio" sub-node that in turn should contain the "ethernet-phy" node describing the external phy. Below properties are required, their bindings already defined in Documentation/devicetree/bindings/net/ethernet.txt or Documentation/devicetree/bindings/net/phy.txt. Required: - phy-handle : Phandle to a PHY on the MDIO bus. Defined in ethernet.txt. - phy-connection-type : Defined in ethernet.txt. - mdio : "mdio" node, defined in mdio.txt. - ethernet-phy : "ethernet-phy" node, defined in phy.txt. Example: ethernet@0,0 { compatible = "fsl,enetc"; reg = <0x000000 0 0 0 0>; phy-handle = <&sgmii_phy0>; phy-connection-type = "sgmii"; mdio { #address-cells = <1>; #size-cells = <0>; sgmii_phy0: ethernet-phy@2 { reg = <0x2>; }; }; }; 1.2. Using the central MDIO PCIe endpoint device In this case, the mdio node should be defined as another PCIe endpoint node, at the same level with the ENETC port nodes. Required properties: - reg : Specifies PCIe Device Number and Function Number of the ENETC endpoint device, according to parent node bindings. - compatible : Should be "fsl,enetc-mdio". The remaining required mdio bus properties are standard, their bindings already defined in Documentation/devicetree/bindings/net/mdio.txt. Example: ethernet@0,0 { compatible = "fsl,enetc"; reg = <0x000000 0 0 0 0>; phy-handle = <&sgmii_phy0>; phy-connection-type = "sgmii"; }; mdio@0,3 { compatible = "fsl,enetc-mdio"; reg = <0x000300 0 0 0 0>; #address-cells = <1>; #size-cells = <0>; sgmii_phy0: ethernet-phy@2 { reg = <0x2>; }; }; 2. The ENETC port is an internal port or has a fixed-link external connection In this case, the ENETC port node defines a fixed link connection, as specified by Documentation/devicetree/bindings/net/fixed-link.txt. Required: - fixed-link : "fixed-link" node, defined in "fixed-link.txt". Example: ethernet@0,2 { compatible = "fsl,enetc"; reg = <0x000200 0 0 0 0>; fixed-link { speed = <1000>; full-duplex; }; };