| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | Kernel driver tc654 |
| 2 | =================== |
| 3 | |
| 4 | Supported chips: |
| 5 | * Microchip TC654 and TC655 |
| 6 | Prefix: 'tc654' |
| 7 | Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/20001734C.pdf |
| 8 | |
| 9 | Authors: |
| 10 | Chris Packham <chris.packham@alliedtelesis.co.nz> |
| 11 | Masahiko Iwamoto <iwamoto@allied-telesis.co.jp> |
| 12 | |
| 13 | Description |
| 14 | ----------- |
| 15 | This driver implements support for the Microchip TC654 and TC655. |
| 16 | |
| 17 | The TC654 uses the 2-wire interface compatible with the SMBUS 2.0 |
| 18 | specification. The TC654 has two (2) inputs for measuring fan RPM and |
| 19 | one (1) PWM output which can be used for fan control. |
| 20 | |
| 21 | Configuration Notes |
| 22 | ------------------- |
| 23 | Ordinarily the pwm1_mode ABI is used for controlling the pwm output |
| 24 | mode. However, for this chip the output is always pwm, and the |
| 25 | pwm1_mode determines if the pwm output is controlled via the pwm1 value |
| 26 | or via the Vin analog input. |
| 27 | |
| 28 | |
| 29 | Setting pwm1_mode to 1 will cause the pwm output to be driven based on |
| 30 | the pwm1 value. Setting pwm1_mode to 0 will cause the pwm output to be |
| 31 | driven based on the Vin input. |