amd-xgbe: AMD 10GbE device bindings documentation

* AMD 10GbE PHY driver (amd-xgbe-phy)

Required properties:

- compatible: Should be "amd,xgbe-phy-seattle-v1a" and

  "ethernet-phy-ieee802.3-c45"

- reg: Address and length of the register sets for the device

   - SerDes Rx/Tx registers

   - SerDes integration registers (1/2)

   - SerDes integration registers (2/2)

Example:

	xgbe_phy@e1240800 {

		compatible = "amd,xgbe-phy-seattle-v1a", "ethernet-phy-ieee802.3-c45";

		reg = <0 0xe1240800 0 0x00400>,

		      <0 0xe1250000 0 0x00060>,

		      <0 0xe1250080 0 0x00004>;

	};

* AMD 10GbE driver (amd-xgbe)

Required properties:

- compatible: Should be "amd,xgbe-seattle-v1a"

- reg: Address and length of the register sets for the device

   - MAC registers

   - PCS registers

- interrupt-parent: Should be the phandle for the interrupt controller

  that services interrupts for this device

- interrupts: Should contain the amd-xgbe interrupt

- clocks: Should be the DMA clock for the amd-xgbe device (used for

  calculating the correct Rx interrupt watchdog timer value on a DMA

  channel for coalescing)

- clock-names: Should be the name of the DMA clock, "dma_clk"

- phy-handle: See ethernet.txt file in the same directory

- phy-mode: See ethernet.txt file in the same directory

Optional properties:

- mac-address: mac address to be assigned to the device. Can be overridden

  by UEFI.

Example:

	xgbe@e0700000 {

		compatible = "amd,xgbe-seattle-v1a";

		reg = <0 0xe0700000 0 0x80000>,

		      <0 0xe0780000 0 0x80000>;

		interrupt-parent = <&gic>;

		interrupts = <0 325 4>;

		clocks = <&xgbe_clk>;

		clock-names = "dma_clk";

		phy-handle = <&phy>;

		phy-mode = "xgmii";

		mac-address = [ 02 a1 a2 a3 a4 a5 ];

	};