doc/device-tree-bindings/i2c/i2c-gpio.txt

   1 I2C gpio device binding
   2 =======================
   3
   4 Driver:
   5 - drivers/i2c/i2c-gpio.c
   6
   7 Software i2c device-tree node properties:
   8 Required:
   9 * #address-cells = <1>;
  10 * #size-cells = <0>;
  11 * compatible = "i2c-gpio";
  12 * gpios = <sda ...>, <scl ...>;
  13
  14 Optional:
  15 * i2c-gpio,delay-us = <5>;
  16    The resulting transfer speed can be adjusted by setting the delay[us]
  17    between gpio-toggle operations. Speed [Hz] = 1000000 / 4 * udelay[us],
  18    It not defined, then default is 5us (~50KHz).
  19
  20 Example:
  21
  22 i2c-gpio@1 {
  23         #address-cells = <1>;
  24         #size-cells = <0>;
  25
  26         compatible = "i2c-gpio";
  27         gpios = <&gpd1 0 GPIO_ACTIVE_HIGH>, /* SDA */
  28                 <&gpd1 1 GPIO_ACTIVE_HIGH>; /* CLK */
  29
  30         i2c-gpio,delay-us = <5>;
  31
  32         some_device@5 {
  33                 compatible = "some_device";
  34                 reg = <0x5>;
  35                 ...
  36         };
  37 };