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

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Date:   Thu, 2 Nov 2023 20:17:35 +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, 2 Nov 2023 at 18:36, Mark Brown <broonie@...nel.org> wrote:
>
> On Thu, Nov 02, 2023 at 05:35:42PM +0530, Naresh Solanki wrote:
> > 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:
>
> > > 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?
>
> I think I'd start off with just reporting things that are obviously
> errors and not things that should ever go off during normal operation.
This is what I could come up with:
        if (event & REGULATOR_EVENT_VOLTAGE_CHANGE) {
                name = dev_attr_microvolts.attr.name;
                sysfs_notify(&rdev->dev.kobj, NULL, name);
        } else if (event & (REGULATOR_EVENT_DISABLE | REGULATOR_EVENT_ENABLE)){
                name = dev_attr_status.attr.name;
                sysfs_notify(&rdev->dev.kobj, NULL, name);
        }

Regards,
Naresh