| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | GMT G762/G763 PWM Fan controller |
| 2 | |
| 3 | Required node properties: |
| 4 | |
| 5 | - "compatible": must be either "gmt,g762" or "gmt,g763" |
| 6 | - "reg": I2C bus address of the device |
| 7 | - "clocks": a fixed clock providing input clock frequency |
| 8 | on CLK pin of the chip. |
| 9 | |
| 10 | Optional properties: |
| 11 | |
| 12 | - "fan_startv": fan startup voltage. Accepted values are 0, 1, 2 and 3. |
| 13 | The higher the more. |
| 14 | |
| 15 | - "pwm_polarity": pwm polarity. Accepted values are 0 (positive duty) |
| 16 | and 1 (negative duty). |
| 17 | |
| 18 | - "fan_gear_mode": fan gear mode. Supported values are 0, 1 and 2. |
| 19 | |
| 20 | If an optional property is not set in .dts file, then current value is kept |
| 21 | unmodified (e.g. u-boot installed value). |
| 22 | |
| 23 | Additional information on operational parameters for the device is available |
| 24 | in Documentation/hwmon/g762.rst. A detailed datasheet for the device is available |
| 25 | at http://natisbad.org/NAS/refs/GMT_EDS-762_763-080710-0.2.pdf. |
| 26 | |
| 27 | Example g762 node: |
| 28 | |
| 29 | clocks { |
| 30 | #address-cells = <1>; |
| 31 | #size-cells = <0>; |
| 32 | |
| 33 | g762_clk: fixedclk { |
| 34 | compatible = "fixed-clock"; |
| 35 | #clock-cells = <0>; |
| 36 | clock-frequency = <8192>; |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | g762: g762@3e { |
| 41 | compatible = "gmt,g762"; |
| 42 | reg = <0x3e>; |
| 43 | clocks = <&g762_clk> |
| 44 | fan_gear_mode = <0>; /* chip default */ |
| 45 | fan_startv = <1>; /* chip default */ |
| 46 | pwm_polarity = <0>; /* chip default */ |
| 47 | }; |