* Samsung's I2C controller

The Samsung's I2C controller is used to interface with I2C devices.

Required properties:
  - compatible: value should be either of the following.
      (a) "samsung, s3c2410-i2c", for i2c compatible with s3c2410 i2c.
      (b) "samsung, s3c2440-i2c", for i2c compatible with s3c2440 i2c.
      (c) "samsung, s3c2440-hdmiphy-i2c", for s3c2440-like i2c used
          inside HDMIPHY block found on several samsung SoCs
  - reg: physical base address of the controller and length of memory mapped
    region.
  - interrupts: interrupt number to the cpu.
  - samsung,i2c-sda-delay: Delay (in ns) applied to data line (SDA) edges.

Optional properties:
  - gpios: The order of the gpios should be the following: <SDA, SCL>.
    The gpio specifier depends on the gpio controller. Required in all
    cases except for "samsung,s3c2440-hdmiphy-i2c" whose input/output
    lines are permanently wired to the respective client
  - samsung,i2c-slave-addr: Slave address in multi-master enviroment. If not
    specified, default value is 0.
  - samsung,i2c-max-bus-freq: Desired frequency in Hz of the bus. If not
    specified, the default value in Hz is 100000.

Example:

	i2c@13870000 {
		compatible = "samsung,s3c2440-i2c";
		reg = <0x13870000 0x100>;
		interrupts = <345>;
		samsung,i2c-sda-delay = <100>;
		samsung,i2c-max-bus-freq = <100000>;
		gpios = <&gpd1 2 0 /* SDA */
			 &gpd1 3 0 /* SCL */>;
		#address-cells = <1>;
		#size-cells = <0>;

		wm8994@1a {
			compatible = "wlf,wm8994";
			reg = <0x1a>;
		};
	};