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

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Date:   Thu, 2 Nov 2023 16:50:38 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Naresh Solanki <naresh.solanki@...ements.com>
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

On Thu, Nov 02, 2023 at 09:03:40PM +0530, Naresh Solanki wrote:
> On Thu, 2 Nov 2023 at 20:31, Mark Brown <broonie@...nel.org> wrote:

> > That's the opposite sense to what I was thinking of - we're reporting
> > voltage changes and enables to userspace rather than just errors.  My
> > concern here is that this could generate an awful lot of notificaitons
> > for normal operation on systems that don't use the uevents, I was
> > expecting this to be used for errors.  Could you remind me what the use
> > case is here, I think I might've got myself confused sorry?

> Sorry for confusion caused because I should first described my application
> requirements.
> Currently my application is interested in know regulator status i.e.,
> ENABLE, DISABLE or ERROR.
> Also events are needed specifically to get them logged like
> UNDER_VOLTAGE, OVER_CURRENT, REGULATION_OUT,
> OVER_TEMP.

Ah, right.  Everything except for the enable and disable there looks
like it should be OK since they should normally just not happen but the
enables and disables might get a bit frequent with runtime PM - not
*super* frequent like voltage scaling but enough that people could have
an issue with it.

Netlink feels like it might be a better fit?  Not really looked at the
kernel side of implementing that and how sensible that ends up looking.

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