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* I2C

Required properties :

 - reg : Offset and length of the register set for the device
 - compatible : should be "mrvl,mmp-twsi" where mmp is the name of a
   compatible processor, e.g. pxa168, pxa910, mmp2, mmp3.
   For the pxa2xx/pxa3xx, an additional node "mrvl,pxa-i2c" is required
   as shown in the example below.

Recommended properties :

 - interrupts : the interrupt number
 - interrupt-parent : the phandle for the interrupt controller that
   services interrupts for this device. If the parent is the default
   interrupt controller in device tree, it could be ignored.
 - mrvl,i2c-polling : Disable interrupt of i2c controller. Polling
   status register of i2c controller instead.
 - mrvl,i2c-fast-mode : Enable fast mode of i2c controller.

Examples:
	twsi1: i2c@d4011000 {
		compatible = "mrvl,mmp-twsi";
		reg = <0xd4011000 0x1000>;
		interrupts = <7>;
		mrvl,i2c-fast-mode;
	};
	
	twsi2: i2c@d4025000 {
		compatible = "mrvl,mmp-twsi";
		reg = <0xd4025000 0x1000>;
		interrupts = <58>;
	};