48 lines
1.3 KiB
Plaintext
48 lines
1.3 KiB
Plaintext
|
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 */
|
||
|
|
};
|