[PATCH v9 0/3] Add support for Allwinner PWM on D1/T113s/R329 SoCs

[きくちゃんさん]

Hi John,

> Does Linux guarantee a flicker-free experience with setting up PWM
> channels, or that it doesn't affect other channels?
> How do other drivers handle this situation?

I've noticed that drivers/pwm/pwm-fsl-ftm.c and
drivers/pwm/pwm-microchip-core.c use a similar approach for shared
resources between PWM channels.
They simply fail if the settings are not applicable to the hardware,
much like this driver does. However, I have yet to find a driver that
aggressively changes another channel that is already running.

Maybe you're right; Linux might not guarantee anything about this.
I think all we can do is deliver the best experience to users within
such limitations.

Best regards,
kikuchan.