linux/Documentation/devicetree/bindings/net/arc_emac.txt
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   1* Synopsys ARC EMAC 10/100 Ethernet driver (EMAC)
   2
   3Required properties:
   4- compatible: Should be "snps,arc-emac"
   5- reg: Address and length of the register set for the device
   6- interrupts: Should contain the EMAC interrupts
   7- clock-frequency: CPU frequency. It is needed to calculate and set polling
   8period of EMAC.
   9- max-speed: Maximum supported data-rate in Mbit/s. In some HW configurations
  10bandwidth of external memory controller might be a limiting factor. That's why
  11it's required to specify which data-rate is supported on current SoC or FPGA.
  12For example if only 10 Mbit/s is supported (10BASE-T) set "10". If 100 Mbit/s is
  13supported (100BASE-TX) set "100".
  14- phy: PHY device attached to the EMAC via MDIO bus
  15
  16Child nodes of the driver are the individual PHY devices connected to the
  17MDIO bus. They must have a "reg" property given the PHY address on the MDIO bus.
  18
  19Optional properties:
  20- mac-address: 6 bytes, mac address
  21
  22Examples:
  23
  24        ethernet@c0fc2000 {
  25                compatible = "snps,arc-emac";
  26                reg = <0xc0fc2000 0x3c>;
  27                interrupts = <6>;
  28                mac-address = [ 00 11 22 33 44 55 ];
  29                clock-frequency = <80000000>;
  30                max-speed = <100>;
  31                phy = <&phy0>;
  32
  33                #address-cells = <1>;
  34                #size-cells = <0>;
  35                phy0: ethernet-phy@0 {
  36                        reg = <1>;
  37                };
  38        };
  39