Kernel-4.18.0-80.el8_arc_emac

• Synopsys ARC EMAC 10/100 Ethernet driver (EMAC)

Required properties:

• compatible: Should be “snps,arc-emac”
• reg: Address and length of the register set for the device
• interrupts: Should contain the EMAC interrupts
• max-speed: see ethernet.txt file in the same directory.
• phy: see ethernet.txt file in the same directory.

Optional properties:

• phy-reset-gpios : Should specify the gpio for phy reset
• phy-reset-duration : Reset duration in milliseconds. Should present
  only if property “phy-reset-gpios” is available. Missing the property
  will have the duration be 1 millisecond. Numbers greater than 1000 are
  invalid and 1 millisecond will be used instead.

Clock handling:
The clock frequency is needed to calculate and set polling period of EMAC.
It must be provided by one of:

• clock-frequency: CPU frequency.
• clocks: reference to the clock supplying the EMAC.

Child nodes of the driver are the individual PHY devices connected to the
MDIO bus. They must have a “reg” property given the PHY address on the MDIO bus.

Examples:

ethernet@c0fc2000 {
    compatible = "snps,arc-emac";
    reg = <0xc0fc2000 0x3c>;
    interrupts = <6>;
    mac-address = [ 00 11 22 33 44 55 ];

    clock-frequency = <80000000>;
    /* or */
    clocks = <&emac_clock>;

    max-speed = <100>;
    phy = <&phy0>;

    #address-cells = <1>;
    #size-cells = <0>;
    phy0: ethernet-phy@0 {
        reg = <1>;
    };
};