linux/Documentation/devicetree/bindings/i2c/i2c-s3c2410.txt
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   1* Samsung's I2C controller
   2
   3The Samsung's I2C controller is used to interface with I2C devices.
   4
   5Required properties:
   6  - compatible: value should be either of the following.
   7      (a) "samsung, s3c2410-i2c", for i2c compatible with s3c2410 i2c.
   8      (b) "samsung, s3c2440-i2c", for i2c compatible with s3c2440 i2c.
   9      (c) "samsung, s3c2440-hdmiphy-i2c", for s3c2440-like i2c used
  10          inside HDMIPHY block found on several samsung SoCs
  11      (d) "samsung, exynos5440-i2c", for s3c2440-like i2c used
  12           on EXYNOS5440 which does not need GPIO configuration.
  13  - reg: physical base address of the controller and length of memory mapped
  14    region.
  15  - interrupts: interrupt number to the cpu.
  16  - samsung,i2c-sda-delay: Delay (in ns) applied to data line (SDA) edges.
  17
  18Required for all cases except "samsung,s3c2440-hdmiphy-i2c":
  19  - Samsung GPIO variant (deprecated):
  20    - gpios: The order of the gpios should be the following: <SDA, SCL>.
  21      The gpio specifier depends on the gpio controller. Required in all
  22      cases except for "samsung,s3c2440-hdmiphy-i2c" whose input/output
  23      lines are permanently wired to the respective clienta
  24  - Pinctrl variant (preferred, if available):
  25    - pinctrl-0: Pin control group to be used for this controller.
  26    - pinctrl-names: Should contain only one value - "default".
  27
  28Optional properties:
  29  - samsung,i2c-slave-addr: Slave address in multi-master environment. If not
  30    specified, default value is 0.
  31  - samsung,i2c-max-bus-freq: Desired frequency in Hz of the bus. If not
  32    specified, the default value in Hz is 100000.
  33
  34Example:
  35
  36        i2c@13870000 {
  37                compatible = "samsung,s3c2440-i2c";
  38                reg = <0x13870000 0x100>;
  39                interrupts = <345>;
  40                samsung,i2c-sda-delay = <100>;
  41                samsung,i2c-max-bus-freq = <100000>;
  42                /* Samsung GPIO variant begins here */
  43                gpios = <&gpd1 2 0 /* SDA */
  44                         &gpd1 3 0 /* SCL */>;
  45                /* Samsung GPIO variant ends here */
  46                /* Pinctrl variant begins here */
  47                pinctrl-0 = <&i2c3_bus>;
  48                pinctrl-names = "default";
  49                /* Pinctrl variant ends here */
  50                #address-cells = <1>;
  51                #size-cells = <0>;
  52
  53                wm8994@1a {
  54                        compatible = "wlf,wm8994";
  55                        reg = <0x1a>;
  56                };
  57        };
  58