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 }; 38
