Re: [PATCH v2 0/7] Rust Abstractions for PWM subsystem with TH1520 PWM driver

[Uwe Kleine-König]

Hello Drew,

On Wed, Jun 11, 2025 at 04:52:22PM -0700, Drew Fustini wrote:
> I also enabled the pwm fan driver. However, there is a probe failure:
> 
> [    1.250921] pwm-fan pwm-fan: Failed to configure PWM: -524
> [    1.256546] pwm-fan pwm-fan: probe with driver pwm-fan failed with error -524

524 = ENOTSUPP, so it seems the request had duty_offset > 0. Does your
fan use PWM_POLARITY_INVERTED? If so, try without that flag. If your fan
really needs an inverted PWM this of course makes fan control buggy.
With the next revision it should work fine (as a duty_offset > 0 should
get rounded down to 0).

Best regards
Uwe

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