linux-kernel - Re: [PATCH] pwm: Fix setting period with #pwm-cells = <1> and of_pwm_single

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Date: Fri, 29 Mar 2024 14:24:54 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Karel Balej <balejk@...fyz.cz>
Cc: regressions@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	linux-pwm@...r.kernel.org
Subject: Re: [PATCH] pwm: Fix setting period with #pwm-cells = <1> and
 of_pwm_single_xlate()

Hello Karel,

On Fri, Mar 29, 2024 at 12:21:15PM +0100, Karel Balej wrote:
> Uwe Kleine-König, 2024-03-29T11:35:40+01:00:
> > For drivers making use of of_pwm_single_xlate() (i.e. those that don't
> > pass a hwpwm index) and also don't pass flags, setting period was
> > wrongly skipped. This affects the pwm-pxa and ti-sn65dsi86 drivers.
> >
> > Reported-by: Karel Balej <balejk@...fyz.cz>
> > Fixes: 40ade0c2e794 ("pwm: Let the of_xlate callbacks accept references without period")
> > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> > ---
> >  drivers/pwm/core.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
> > index 54a62879fffa..ee3ef3f44bc5 100644
> > --- a/drivers/pwm/core.c
> > +++ b/drivers/pwm/core.c
> > @@ -512,7 +512,7 @@ of_pwm_single_xlate(struct pwm_chip *chip, const struct of_phandle_args *args)
> >  	if (IS_ERR(pwm))
> >  		return pwm;
> >  
> > -	if (args->args_count > 1)
> > +	if (args->args_count > 0)
> >  		pwm->args.period = args->args[0];
> >  
> >  	pwm->args.polarity = PWM_POLARITY_NORMAL;
> > -- 
> > 2.43.0
> 
> Thank you, this fixes the issue for me.
> 
> Tested-by: Karel Balej <balejk@...fyz.cz>

Great, thanks for your report and test.

> Just a nit: I am not sure if perhaps this being part of the report
> thread is sufficient, but generally there should probably also be a
> Closes: trailer for regzbot to automatically mark the report as resolved
> among other reasons.

I applied this patch and added

Link: https://lore.kernel.org/r/D05IVTPYH35N.2CLDG6LSILRSN@matfyz.cz

to the Signoff area which should be good enough to make the regzbot
recognize this as the matching fix.

Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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