linux-kernel - Re: [PATCH v6 00/21] Introduce power-off+restart call chain API

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Message-ID: <CAJZ5v0g0MrBm2+GwctkB7kUyBEt6HTAexRCFFRmTF1UKDrVQ-g@mail.gmail.com>
Date:   Wed, 16 Feb 2022 13:25:39 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
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        "K . C . Kuen-Chern Lin" <kclin@...estech.com>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>
Subject: Re: [PATCH v6 00/21] Introduce power-off+restart call chain API

On Tue, Feb 15, 2022 at 11:00 PM Dmitry Osipenko <digetx@...il.com> wrote:
>
> 31.01.2022 02:36, Dmitry Osipenko пишет:
> > Problem
> > -------
> >
> > SoC devices require power-off call chaining functionality from kernel.
> > We have a widely used restart chaining provided by restart notifier API,
> > but nothing for power-off.
> >
> > Solution
> > --------
> >
> > Introduce new API that provides both restart and power-off call chains.
> >
> > Why combine restart with power-off? Because drivers often do both.
> > More practical to have API that provides both under the same roof.
> >
> > The new API is designed with simplicity and extensibility in mind.
> > It's built upon the existing restart and reboot APIs. The simplicity
> > is in new helper functions that are convenient for drivers. The
> > extensibility is in the design that doesn't hardcode callback
> > arguments, making easy to add new parameters and remove old.
> >
> > This is a third attempt to introduce the new API. First was made by
> > Guenter Roeck back in 2014, second was made by Thierry Reding in 2017.
> > In fact the work didn't stop and recently arm_pm_restart() was removed
> > from v5.14 kernel, which was a part of preparatory work started by
> > Guenter Roeck. I took into account experience and ideas from the
> > previous attempts, extended and polished them.
>
>
> Rafael and all, do you see anything critical that needs to be improved
> in this v6?
>
> Will be great if you could take this patchset via the power tree if it
> looks okay, or give an ack.

I need some more time for this, sorry.

I'm a bit concerned about seeing no response to this set from anyone.

It looks like multiple platforms may be affected by it in principle,
so doesn't anyone care?