Re: [PATCH 1/2] iio: pressure: mpl115: add system suspend/resume support

[Paul Cercueil <paul@crapouillou.net>]

Hi,

Le dimanche 22 février 2026 à 16:40 +0000, Jonathan Cameron a écrit :
> On Sat, 21 Feb 2026 12:26:00 -0500
> Neel Bullywon <neelb2403@gmail.com> wrote:
> 
> > The driver currently only implements runtime PM callbacks to
> > control
> > the shutdown GPIO, but lacks system suspend/resume support. This
> > means
> > the device may remain powered during system sleep, wasting energy.
> > 
> > Add system sleep PM ops using pm_runtime_force_suspend() and
> > pm_runtime_force_resume() to properly synchronize the runtime PM
> > state
> > across system suspend/resume cycles. This ensures the shutdown GPIO
> > is
> > asserted during system sleep when the device has a shutdown GPIO
> > configured.
> > 
> > Signed-off-by: Neel Bullywon <neelb2403@gmail.com>
> 
> Interestingly for the non exported version we have
> DEFINE_RUNTIME_DEV_PM_OPS()
> and the docs for that suggest we should use
> EXPORT_RUNTIME_DEV_PM_OPS() but as you've realized that doesn't set
> the
> suspend and resume callbacks. If that was intentional then the
> documentation
> is less than clear (and I don't remember that being the intent)
> 
> +CC Paul and Rafael.
> 
> We have very few users of these macros, so it should be easy enough
> to
> make the export variants consistent if we want to.

Looks like the users are all in IIO which makes it even more
convenient.

It's been a while so my memory is fuzzy, but it would make sense to
have the suspend/resume callbacks, indeed.

> Jonathan
> 
> > ---
> >  drivers/iio/pressure/mpl115.c | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/iio/pressure/mpl115.c
> > b/drivers/iio/pressure/mpl115.c
> > index 830a5065c008..29794ce53bc6 100644
> > --- a/drivers/iio/pressure/mpl115.c
> > +++ b/drivers/iio/pressure/mpl115.c
> > @@ -244,8 +244,10 @@ static int mpl115_runtime_resume(struct device
> > *dev)
> >  	return 0;
> >  }
> >  
> > -EXPORT_NS_RUNTIME_DEV_PM_OPS(mpl115_dev_pm_ops,
> > mpl115_runtime_suspend,
> > -			  mpl115_runtime_resume, NULL,
> > IIO_MPL115);
> > +EXPORT_NS_GPL_DEV_PM_OPS(mpl115_dev_pm_ops, IIO_MPL115) = {
> > +	SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> > pm_runtime_force_resume)
> > +	RUNTIME_PM_OPS(mpl115_runtime_suspend,
> > mpl115_runtime_resume, NULL)
> > +};

One thing I noticed is that now the symbols are exported as GPL, which
is probably fine (better than the other way around) but if that was on
purpose, it should at least be mentioned in the commit message.

Cheers,
-Paul