Documentation: add Device tree bindings for Broadcom GENET

* Broadcom BCM7xxx Ethernet Controller (GENET)

Required properties:

- compatible: should contain one of "brcm,genet-v1", "brcm,genet-v2",

  "brcm,genet-v3", "brcm,genet-v4".

- reg: address and length of the register set for the device

- interrupts: must be two cells, the first cell is the general purpose

  interrupt line, while the second cell is the interrupt for the ring

  RX and TX queues operating in ring mode

- phy-mode: String, operation mode of the PHY interface. Supported values are

  "mii", "rgmii", "rgmii-txid", "rev-mii", "moca". Analogous to ePAPR

  "phy-connection-type" values

- address-cells: should be 1

- size-cells: should be 1

Optional properties:

- clocks: When provided, must be two cells, first one is the main GENET clock

  and the second cell is the Genet Wake-on-LAN clock.

- phy-handle: A phandle to a phy node defining the PHY address (as the reg

  property, a single integer), used to describe configurations where a PHY

  (internal or external) is used.

- fixed-link: When the GENET interface is connected to a MoCA hardware block or

  when operating in a RGMII to RGMII type of connection, or when the MDIO bus is

  voluntarily disabled, this property should be used to describe the "fixed link".

  See Documentation/devicetree/bindings/net/fsl-tsec-phy.txt for information on

  the property specifics

Required child nodes:

- mdio bus node: this node should always be present regarless of the PHY

  configuration of the GENET instance

MDIO bus node required properties:

- compatible: should contain one of "brcm,genet-mdio-v1", "brcm,genet-mdio-v2"

  "brcm,genet-mdio-v3", "brcm,genet-mdio-v4", the version has to match the

  parent node compatible property (e.g: brcm,genet-v4 pairs with

  brcm,genet-mdio-v4)

- reg: address and length relative to the parent node base register address

- address-cells: address cell for MDIO bus addressing, should be 1

- size-cells: size of the cells for MDIO bus addressing, should be 0

Ethernet PHY node properties:

See Documentation/devicetree/bindings/net/phy.txt for the list of required and

optional properties.

Internal Gigabit PHY example:

ethernet@f0b60000 {

	phy-mode = "internal";

	phy-handle = <&phy1>;

	mac-address = [ 00 10 18 36 23 1a ];

	compatible = "brcm,genet-v4";

	#address-cells = <0x1>;

	#size-cells = <0x1>;

	reg = <0xf0b60000 0xfc4c>;

	interrupts = <0x0 0x14 0x0>, <0x0 0x15 0x0>;

	mdio@e14 {

		compatible = "brcm,genet-mdio-v4";

		#address-cells = <0x1>;

		#size-cells = <0x0>;

		reg = <0xe14 0x8>;

		phy1: ethernet-phy@1 {

			max-speed = <1000>;

			reg = <0x1>;

			compatible = "brcm,28nm-gphy", "ethernet-phy-ieee802.3-c22";

		};

	};

};

MoCA interface / MAC to MAC example:

ethernet@f0b80000 {

	phy-mode = "moca";

	fixed-link = <1 0 1000 0 0>;

	mac-address = [ 00 10 18 36 24 1a ];

	compatible = "brcm,genet-v4";

	#address-cells = <0x1>;

	#size-cells = <0x1>;

	reg = <0xf0b80000 0xfc4c>;

	interrupts = <0x0 0x16 0x0>, <0x0 0x17 0x0>;

	mdio@e14 {

		compatible = "brcm,genet-mdio-v4";

		#address-cells = <0x1>;

		#size-cells = <0x0>;

		reg = <0xe14 0x8>;

	};

};

External MDIO-connected Gigabit PHY/switch:

ethernet@f0ba0000 {

	phy-mode = "rgmii";

	phy-handle = <&phy0>;

	mac-address = [ 00 10 18 36 26 1a ];

	compatible = "brcm,genet-v4";

	#address-cells = <0x1>;

	#size-cells = <0x1>;

	reg = <0xf0ba0000 0xfc4c>;

	interrupts = <0x0 0x18 0x0>, <0x0 0x19 0x0>;

	mdio@0e14 {

		compatible = "brcm,genet-mdio-v4";

		#address-cells = <0x1>;

		#size-cells = <0x0>;

		reg = <0xe14 0x8>;

		phy0: ethernet-phy@0 {

			max-speed = <1000>;

			reg = <0x0>;

			compatible = "brcm,bcm53125", "ethernet-phy-ieee802.3-c22";

		};

	};

};