Marvell Distributed Switch Architecture Device Tree Bindings
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Required properties:
- compatible		: Should be "marvell,dsa"
- #address-cells	: Must be 2, first cell is the address on the MDIO bus
			  and second cell is the address in the switch tree.
			  Second cell is used only when cascading/chaining.
- #size-cells		: Must be 0
- dsa,ethernet		: Should be a phandle to a valid Ethernet device node
- dsa,mii-bus		: Should be a phandle to a valid MDIO bus device node

Optionnal properties:
- interrupts		: property with a value describing the switch
			  interrupt number (not supported by the driver)

A DSA node can contain multiple switch chips which are therefore child nodes of
the parent DSA node. The maximum number of allowed child nodes is 4
(DSA_MAX_SWITCHES).
Each of these switch child nodes should have the following required properties:

- reg			: Describes the switch address on the MII bus
- #address-cells	: Must be 1
- #size-cells		: Must be 0

A switch may have multiple "port" children nodes

Each port children node must have the following mandatory properties:
- reg			: Describes the port address in the switch
- label			: Describes the label associated with this port, special
			  labels are "cpu" to indicate a CPU port and "dsa" to
			  indicate an uplink/downlink port.

Note that a port labelled "dsa" will imply checking for the uplink phandle
described below.

Optionnal property:
- link			: Should be a phandle to another switch's DSA port.
			  This property is only used when switches are being
			  chained/cascaded together.

Example:

	dsa@0 {
		compatible = "marvell,dsa";
		#address-cells = <2>;
		#size-cells = <0>;

		interrupts = <10>;
		dsa,ethernet = <&ethernet0>;
		dsa,mii-bus = <&mii_bus0>;

		switch@0 {
			#address-cells = <1>;
			#size-cells = <0>;
			reg = <16 0>;	/* MDIO address 16, switch 0 in tree */

			port@0 {
				reg = <0>;
				label = "lan1";
			};

			port@1 {
				reg = <1>;
				label = "lan2";
			};

			port@5 {
				reg = <5>;
				label = "cpu";
			};

			switch0uplink: port@6 {
				reg = <6>;
				label = "dsa";
				link = <&switch1uplink>;
			};
		};

		switch@1 {
			#address-cells = <1>;
			#size-cells = <0>;
			reg = <17 1>;	/* MDIO address 17, switch 1 in tree */

			switch1uplink: port@0 {
				reg = <0>;
				label = "dsa";
				link = <&switch0uplink>;
			};
		};
	};