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+* 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;
+ };
+ };