net: dsa: Add DT bindings for Vitesse VSC73xx switches

Vitesse VSC73xx Switches

========================

This defines device tree bindings for the Vitesse VSC73xx switch chips.

The Vitesse company has been acquired by Microsemi and Microsemi in turn

acquired by Microchip but retains this vendor branding.

The currently supported switch chips are:

Vitesse VSC7385 SparX-G5 5+1-port Integrated Gigabit Ethernet Switch

Vitesse VSC7388 SparX-G8 8-port Integrated Gigabit Ethernet Switch

Vitesse VSC7395 SparX-G5e 5+1-port Integrated Gigabit Ethernet Switch

Vitesse VSC7398 SparX-G8e 8-port Integrated Gigabit Ethernet Switch

The device tree node is an SPI device so it must reside inside a SPI bus

device tree node, see spi/spi-bus.txt

Required properties:

- compatible: must be exactly one of:

	"vitesse,vsc7385"

	"vitesse,vsc7388"

	"vitesse,vsc7395"

	"vitesse,vsc7398"

- gpio-controller: indicates that this switch is also a GPIO controller,

  see gpio/gpio.txt

- #gpio-cells: this must be set to <2> and indicates that we are a twocell

  GPIO controller, see gpio/gpio.txt

Optional properties:

- reset-gpios: a handle to a GPIO line that can issue reset of the chip.

  It should be tagged as active low.

Required subnodes:

See net/dsa/dsa.txt for a list of additional required and optional properties

and subnodes of DSA switches.

Examples:

switch@0 {

	compatible = "vitesse,vsc7395";

	reg = <0>;

	/* Specified for 2.5 MHz or below */

	spi-max-frequency = <2500000>;

	gpio-controller;

	#gpio-cells = <2>;

	ports {

		#address-cells = <1>;

		#size-cells = <0>;

		port@0 {

			reg = <0>;

			label = "lan1";

		};

		port@1 {

			reg = <1>;

			label = "lan2";

		};

		port@2 {

			reg = <2>;

			label = "lan3";

		};

		port@3 {

			reg = <3>;

			label = "lan4";

		};

		vsc: port@6 {

			reg = <6>;

			label = "cpu";

			ethernet = <&gmac1>;

			phy-mode = "rgmii";

			fixed-link {

				speed = <1000>;

				full-duplex;

				pause;

			};

		};

	};

};

variscite	Variscite Ltd.

via	VIA Technologies, Inc.

virtio	Virtual I/O Device Specification, developed by the OASIS consortium

vitesse	Vitesse Semiconductor Corporation

vivante	Vivante Corporation

vocore VoCore Studio

voipac	Voipac Technologies s.r.o.