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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
- "clocks": a fixed clock providing input clock frequency
on CLK pin of the chip.
Optional properties:
- "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.rst. 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:
clocks {
#address-cells = <1>;
#size-cells = <0>;
g762_clk: fixedclk {
compatible = "fixed-clock";
#clock-cells = <0>;
clock-frequency = <8192>;
}
}
g762: g762@3e {
compatible = "gmt,g762";
reg = <0x3e>;
clocks = <&g762_clk>
fan_gear_mode = <0>; /* chip default */
fan_startv = <1>; /* chip default */
pwm_polarity = <0>; /* chip default */
};
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