Kernel-4.18.0-80.el8_cavium-mdio

• System Management Interface (SMI) / MDIO

Properties:

• compatible: One of:

  “cavium,octeon-3860-mdio”: Compatibility with all cn3XXX, cn5XXX

                   and cn6XXX SOCs.
  

  “cavium,thunder-8890-mdio”: Compatibility with all cn8XXX SOCs.

• reg: The base address of the MDIO bus controller register bank.

• #address-cells: Must be <1>.

• #size-cells: Must be <0>. MDIO addresses have no size component.

Typically an MDIO bus might have several children.

Example:
mdio@1180000001800 {
compatible = “cavium,octeon-3860-mdio”;
#address-cells = <1>;
#size-cells = <0>;
reg = <0x11800 0x00001800 0x0 0x40>;

    ethernet-phy@0 {
        ...
        reg = <0>;
    };
};

• System Management Interface (SMI) / MDIO Nexus

  Several mdio buses may be gathered as children of a single PCI
  device, this PCI device is the nexus of the buses.

Properties:

• compatible: “cavium,thunder-8890-mdio-nexus”;

• reg: The PCI device and function numbers of the nexus device.

• #address-cells: Must be <2>.

• #size-cells: Must be <2>.

• ranges: As needed for mapping of the MDIO bus device registers.

• assigned-addresses: As needed for mapping of the MDIO bus device registers.

Example:

    mdio-nexus@1,3 {
            compatible = "cavium,thunder-8890-mdio-nexus";
            #address-cells = <2>;
            #size-cells = <2>;
            reg = <0x0b00 0 0 0 0>; /* DEVFN = 0x0b (1:3) */
            assigned-addresses = <0x03000000 0x87e0 0x05000000 0x0 0x800000>;
            ranges = <0x87e0 0x05000000 0x03000000 0x87e0 0x05000000 0x0 0x800000>;

            mdio0@87e0,05003800 {
                    compatible = "cavium,thunder-8890-mdio";
                    #address-cells = <1>;
                    #size-cells = <0>;
                    reg = <0x87e0 0x05003800 0x0 0x30>;

                    ethernet-phy@0 {
                            ...
                            reg = <0>;
                    };
            };
            mdio0@87e0,05003880 {
                    compatible = "cavium,thunder-8890-mdio";
                    #address-cells = <1>;
                    #size-cells = <0>;
                    reg = <0x87e0 0x05003880 0x0 0x30>;

                    ethernet-phy@0 {
                            ...
                            reg = <0>;
                    };
            };
    };