Signed-off-by: Arnaud Ebalard <arno@xxxxxxxxxxxx> --- Documentation/devicetree/bindings/hwmon/g762.txt | 58 ++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 Documentation/devicetree/bindings/hwmon/g762.txt diff --git a/Documentation/devicetree/bindings/hwmon/g762.txt b/Documentation/devicetree/bindings/hwmon/g762.txt new file mode 100644 index 0000000..3f7ccbf --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/g762.txt @@ -0,0 +1,58 @@ +GMT G762/G763 PWM Fan controller + +Required node properties: + + - "compatible": must be either "gmt,g762" or "gmt,g763" + - "reg": I2C bus address of the device + +Optional properties: + + - "pwm_mode": fan driving mode. 1 for PWM mode, 0 for DC mode. + + - "pwm_enable": fan speed control. 1 for open-loop, 2 for closed-loop. + + - "pwm_freq": reference clock frequency for PWM mode in Hz. If not set, + default value is 32768. + + - "fan_pulses": number of pulses per fan revolution. Supported values + are 2 and 4. + + - "fan_div": fan clock frequency divisor value. Supported values are 1, + 2, 4 and 8. Default is 1. + + - "fan_target": initial target fan speed in RPM. Only works in closed-loop + fan speed control, i.e. when pwm_enable has already been set + to 2. + + - "fan_startv": fan startup voltage. Accepted values are 0, 1, 2 and 3. + The higher the more. + + - "pwm_polarity": pwm polarity. Accepted values are 0 (positive duty) + and 1 (negative duty). + + - "fan_gear_mode": fan gear mode. Supported values are 0, 1 and 2. + +If an optional property is not set in .dts file, then current value is kept +unmodified (e.g. u-boot installed value). + + +Additional information on operational parameters for the device is available +in Documentation/hwmon/g762. A detailed datasheet for the device is available +at http://natisbad.org/NAS/refs/GMT_EDS-762_763-080710-0.2.pdf. + +Example g762 node: + + g762: g762@3e { + compatible = "gmt,g762"; + reg = <0x3e>; + pwm_mode = <1>; /* closed-loop control */ + pwm_enable = <2>; /* PWM mode */ + pwm_freq = <8192>; /* PWM reference clock freq */ + fan_pulses = <2>; /* 2 pulses per rev */ + fan_div = <2>; /* fan clock divisor */ + fan_target = <2000>; /* target fan speed at 2000 RPM */ + fan_gear_mode = <0>; /* chip default */ + fan_startv = <1>; /* chip default */ + pwm_polarity = <0>; /* chip default */ + }; + -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
