projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 594fbe71 AE |
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 | |
| 7ebd8b66 | 24 | in Documentation/hwmon/g762.rst. A detailed datasheet for the device is available |
| 594fbe71 AE |
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 | }; |