TI SoC Ethernet Switch Controller Device Tree Bindings
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Required properties:
- compatible		: Should be "ti,cpsw"
- reg			: physical base address and size of the cpsw
			  registers map
- interrupts		: property with a value describing the interrupt
			  number
- interrupt-parent	: The parent interrupt controller
- cpdma_channels 	: Specifies number of channels in CPDMA
- ale_entries		: Specifies No of entries ALE can hold
- bd_ram_size		: Specifies internal descriptor RAM size
- rx_descs		: Specifies number of Rx descriptors
- mac_control		: Specifies Default MAC control register content
			  for the specific platform
- slaves		: Specifies number for slaves
- active_slave		: Specifies the slave to use for time stamping,
			  ethtool and SIOCGMIIPHY
- cpts_clock_mult	: Numerator to convert input clock ticks into nanoseconds
- cpts_clock_shift	: Denominator to convert input clock ticks into nanoseconds

Optional properties:
- ti,hwmods		: Must be "cpgmac0"
- no_bd_ram		: Must be 0 or 1
- dual_emac		: Specifies Switch to act as Dual EMAC

Slave Properties:
Required properties:
- phy_id		: Specifies slave phy id
- phy-mode		: See ethernet.txt file in the same directory
- mac-address		: See ethernet.txt file in the same directory

Optional properties:
- dual_emac_res_vlan	: Specifies VID to be used to segregate the ports

Note: "ti,hwmods" field is used to fetch the base address and irq
resources from TI, omap hwmod data base during device registration.
Future plan is to migrate hwmod data base contents into device tree
blob so that, all the required data will be used from device tree dts
file.

Examples:

	mac: ethernet@4A100000 {
		compatible = "ti,cpsw";
		reg = <0x4A100000 0x1000>;
		interrupts = <55 0x4>;
		interrupt-parent = <&intc>;
		cpdma_channels = <8>;
		ale_entries = <1024>;
		bd_ram_size = <0x2000>;
		no_bd_ram = <0>;
		rx_descs = <64>;
		mac_control = <0x20>;
		slaves = <2>;
		active_slave = <0>;
		cpts_clock_mult = <0x80000000>;
		cpts_clock_shift = <29>;
		cpsw_emac0: slave@0 {
			phy_id = <&davinci_mdio>, <0>;
			phy-mode = "rgmii-txid";
			/* Filled in by U-Boot */
			mac-address = [ 00 00 00 00 00 00 ];
		};
		cpsw_emac1: slave@1 {
			phy_id = <&davinci_mdio>, <1>;
			phy-mode = "rgmii-txid";
			/* Filled in by U-Boot */
			mac-address = [ 00 00 00 00 00 00 ];
		};
	};

(or)
	mac: ethernet@4A100000 {
		compatible = "ti,cpsw";
		ti,hwmods = "cpgmac0";
		cpdma_channels = <8>;
		ale_entries = <1024>;
		bd_ram_size = <0x2000>;
		no_bd_ram = <0>;
		rx_descs = <64>;
		mac_control = <0x20>;
		slaves = <2>;
		active_slave = <0>;
		cpts_clock_mult = <0x80000000>;
		cpts_clock_shift = <29>;
		cpsw_emac0: slave@0 {
			phy_id = <&davinci_mdio>, <0>;
			phy-mode = "rgmii-txid";
			/* Filled in by U-Boot */
			mac-address = [ 00 00 00 00 00 00 ];
		};
		cpsw_emac1: slave@1 {
			phy_id = <&davinci_mdio>, <1>;
			phy-mode = "rgmii-txid";
			/* Filled in by U-Boot */
			mac-address = [ 00 00 00 00 00 00 ];
		};
	};