Re: [PATCH] pwm: pca9685: fix pwm/gpio inter-operation
From: Sven Van Asbroeck
Date: Tue Jun 04 2019 - 09:38:53 EST
Thank you for the review, Mika ! See comments below.
On Tue, Jun 4, 2019 at 5:14 AM Mika Westerberg
> > This approach will also prevent the request of the "all" pwm channel, if any
> > other pwm channel is already in use. Is this correct behaviour?
> Sounds correct to me.
Something that occurred to me right after I pressed the send button:
This patch will prevent a pwm 'all channels' request if at least one
of the pwm's is in use. But it will not guard against the opposite:
after the 'all channels' pwm is requested, it will still allow requests
for other pwms/gpios !
This is identical to the old behaviour. But maybe this is an oversight
and not a feature?
1. prevent request of 'all channel' if any of the pwms/gpios are in use
2. prevent request of all other pwms/gpios if 'all channels' is in use
> Can we call it pca9685_pwm_test_and_set_inuse() following naming of
Sounds good to me.
> > +static void pca9685_pwm_clear_inuse(struct pca9685 *pca, struct pwm_device *pwm)
> I think it might be better if you provide __pca9685_pwm_clear_inuse()
> that does not take the lock and then pca9685_pwm_clear_inuse() that just
> calls the former. Then ->
I agree, this is much cleaner.