Re: [PATCH V4 2/2] pwm: Add GPIO PWM driver

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Hi Chris,

Am 27.02.24 um 16:32 schrieb Chris Morgan:
I have a series of devices with GPIO controlled force feedback that
this driver helps us control better. So I'm looking forward to this,
thank you.
Thanks for testing. I didn't had much time recently and i was fighting
with hr timer resolution stuff. But will try to send the next version in
March.
Note that when I set the resolution too low (I got confused and set
the period to 255) my device locked up hard and only a forced
power cycle could bring it back.
Unfortunately this is a general design issue by driving the GPIO by a
kernel driver and "expected" behavior. I didn't have a good solution for
it yet.

What period is too low without limiting other users?

The only idea which comes to my mind is to introduce a kernel parameter
for this driver to set a lower period limit. This can be provided by
some administrator or system designer with enough experience. So a
general user doesn't need to care about it.

Best regards

Tested-by: Chris Morgan <macromorgan@xxxxxxxxxxx>






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