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* Synopsys DesignWare I2C

Required properties :

 - compatible : should be "snps,designware-i2c"
 - reg : Offset and length of the register set for the device
 - interrupts : <IRQ> where IRQ is the interrupt number.

Recommended properties :

 - clock-frequency : desired I2C bus clock frequency in Hz.

Example :

	i2c@f0000 {
		#address-cells = <1>;
		#size-cells = <0>;
		compatible = "snps,designware-i2c";
		reg = <0xf0000 0x1000>;
		interrupts = <11>;
		clock-frequency = <400000>;
	};