linux-kernel - Re: [PATCH] drivers/regulator: Notify sysfs about status changes

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Date:   Thu, 2 Nov 2023 17:35:42 +0530
From:   Naresh Solanki <naresh.solanki@...ements.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     zev@...ilderbeest.net, Liam Girdwood <lgirdwood@...il.com>,
        Patrick Rudolph <patrick.rudolph@...ements.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/regulator: Notify sysfs about status changes

Hi Mark,

On Thu, 5 Oct 2023 at 22:30, Mark Brown <broonie@...nel.org> wrote:
>
> On Thu, Oct 05, 2023 at 03:30:58PM +0200, Naresh Solanki wrote:
>
> >  static int _notifier_call_chain(struct regulator_dev *rdev,
> >                                 unsigned long event, void *data)
> >  {
> > +     const char *name;
> > +     int ret;
> > +
> >       /* call rdev chain first */
> > -     return blocking_notifier_call_chain(&rdev->notifier, event, data);
> > +     ret =  blocking_notifier_call_chain(&rdev->notifier, event, data);
> > +
> > +     if (event & REGULATOR_EVENT_VOLTAGE_CHANGE) {
> > +             name = dev_attr_microvolts.attr.name;
> > +             sysfs_notify(&rdev->dev.kobj, NULL, name);
> > +     } else {
> > +             name = dev_attr_status.attr.name;
> > +             sysfs_notify(&rdev->dev.kobj, NULL, name);
> > +     }
>
> We probably should filter the events more, there's events for pre and
> post voltage change for example which aren't status changes so would be
> spurious.  It ought not to break anything but we should still avoid
> unneeded work.
Can you please provide me inputs on the additional filtering needed for this.
Like some list of events for notify on status?