Kernel-3.10.0-957.el7_i2c-s3c2410

• 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
  

  (d) “samsung, exynos5440-i2c”, for s3c2440-like i2c used
  on EXYNOS5440 which does not need GPIO configuration.
• 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.

Required for all cases except “samsung,s3c2440-hdmiphy-i2c”:

• Samsung GPIO variant (deprecated):
  • 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 clienta
• Pinctrl variant (preferred, if available):
  • pinctrl-0: Pin control group to be used for this controller.
  • pinctrl-names: Should contain only one value - “default”.

Optional properties:

• samsung,i2c-slave-addr: Slave address in multi-master environment. 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>;
    /* Samsung GPIO variant begins here */
    gpios = <&gpd1 2 0 /* SDA */
         &gpd1 3 0 /* SCL */>;
    /* Samsung GPIO variant ends here */
    /* Pinctrl variant begins here */
    pinctrl-0 = <&i2c3_bus>;
    pinctrl-names = "default";
    /* Pinctrl variant ends here */
    #address-cells = <1>;
    #size-cells = <0>;

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