On 14/04/2024 06:22, Chanh Nguyen wrote: > The max31790 supports six pins, which are dedicated PWM outputs. Any of the > six PWM outputs can also be configured to serve as tachometer inputs, > allowing for up to 12 tachometer fans to be monitored. > > Add a new vendor-specific property, 'maxim,pwmout-pin-as-tach-input', > to allow PWMOUT to become a TACH input. > > An array of six integers responds to six PWM channels for configuring > the PWM to TACH mode. When set to 0, the associated PWMOUT produces > a PWM waveform for control of fan speed. When set to 1, PWMOUT becomes > a TACH input. > > Signed-off-by: Chanh Nguyen <chanh@xxxxxxxxxxxxxxxxxxxxxx> > --- > Changes in v2: > - Update the vendor property name to "maxim,pwmout-pin-as-tach-input" [Rob] > - Update commit message [Krzysztof] Please put binding before its user. > --- > .../devicetree/bindings/hwmon/maxim,max31790.yaml | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/Documentation/devicetree/bindings/hwmon/maxim,max31790.yaml b/Documentation/devicetree/bindings/hwmon/maxim,max31790.yaml > index a561e5a3e9e4..2d4f50bc7c41 100644 > --- a/Documentation/devicetree/bindings/hwmon/maxim,max31790.yaml > +++ b/Documentation/devicetree/bindings/hwmon/maxim,max31790.yaml > @@ -30,6 +30,16 @@ properties: > resets: > maxItems: 1 > > + maxim,pwmout-pin-as-tach-input: > + description: | > + An array of six integers responds to six PWM channels for > + configuring the pwm to tach mode. > + When set to 0, the associated PWMOUT produces a PWM waveform for > + control of fan speed. When set to 1, PWMOUT becomes a TACH input > + $ref: /schemas/types.yaml#/definitions/uint8-array > + maxItems: 6 > + minItems: 6 tach-ch solves your case. You define which inputs should be used for tach. Best regards, Krzysztof
