Quoting Jon Hunter (2022-10-10 03:00:46)
> Commit 8c193f4714df ("pwm: tegra: Optimize period calculation") updated
> the period calculation in the Tegra PWM driver and now returns an error
> if the period requested is less than minimum period supported. This is
> breaking PWM support on various Tegra platforms. For example, on the
> Tegra210 Jetson Nano platform this is breaking the PWM fan support and
> probing the PWM fan driver now fails ...
>
> pwm-fan pwm-fan: Failed to configure PWM: -22
> pwm-fan: probe of pwm-fan failed with error -22
>
> The problem is that the default parent clock for the PWM on Tegra210 is
> a 32kHz clock and is unable to support the requested PWM period.
>
> Fix PWM support on Tegra20, Tegra30, Tegra114, Tegra124 and Tegra210 by
> updating the parent clock for the PWM to be the PLL_P.
>
> Fixes: 8c193f4714df ("pwm: tegra: Optimize period calculation")
> Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx>
> Tested-by: Robert Eckelmann <longnoserob@xxxxxxxxx> # TF101 T20
> Tested-by: Antoni Aloy Torrens <aaloytorrens@xxxxxxxxx> # TF101 T20
> Tested-by: Svyatoslav Ryhel <clamor95@xxxxxxxxx> # TF201 T30
> Tested-by: Andreas Westman Dorcsak <hedmoo@xxxxxxxxx> # TF700T T3
> ---
Applied to clk-next
