0001 GMT G762/G763 PWM Fan controller
0002
0003 Required node properties:
0004
0005 - "compatible": must be either "gmt,g762" or "gmt,g763"
0006 - "reg": I2C bus address of the device
0007 - "clocks": a fixed clock providing input clock frequency
0008 on CLK pin of the chip.
0009
0010 Optional properties:
0011
0012 - "fan_startv": fan startup voltage. Accepted values are 0, 1, 2 and 3.
0013 The higher the more.
0014
0015 - "pwm_polarity": pwm polarity. Accepted values are 0 (positive duty)
0016 and 1 (negative duty).
0017
0018 - "fan_gear_mode": fan gear mode. Supported values are 0, 1 and 2.
0019
0020 If an optional property is not set in .dts file, then current value is kept
0021 unmodified (e.g. u-boot installed value).
0022
0023 Additional information on operational parameters for the device is available
0024 in Documentation/hwmon/g762.rst. A detailed datasheet for the device is available
0025 at http://natisbad.org/NAS/refs/GMT_EDS-762_763-080710-0.2.pdf.
0026
0027 Example g762 node:
0028
0029 clocks {
0030 #address-cells = <1>;
0031 #size-cells = <0>;
0032
0033 g762_clk: fixedclk {
0034 compatible = "fixed-clock";
0035 #clock-cells = <0>;
0036 clock-frequency = <8192>;
0037 }
0038 }
0039
0040 g762: g762@3e {
0041 compatible = "gmt,g762";
0042 reg = <0x3e>;
0043 clocks = <&g762_clk>
0044 fan_gear_mode = <0>; /* chip default */
0045 fan_startv = <1>; /* chip default */
0046 pwm_polarity = <0>; /* chip default */
0047 };
