linux-kernel - Re: [GIT PULL] ARM: SoC/genpd driver updates for v6.6

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Message-ID: <CAPDyKFpctt6AQBpu+vBQ0ymW3PQGB8dt8-QEhgbz0Uo5T-1Wxw@mail.gmail.com>
Date:   Mon, 11 Sep 2023 14:06:52 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Olof Johansson <olof@...om.net>,
        soc@...nel.org, linux-arm-kernel@...ts.infradead.org,
        Sebastian Reichel <sebastian.reichel@...labora.com>
Subject: Re: [GIT PULL] ARM: SoC/genpd driver updates for v6.6

On Mon, 11 Sept 2023 at 13:48, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Ulf,
>
> On Mon, Sep 11, 2023 at 1:28 PM Ulf Hansson <ulf.hansson@...aro.org> wrote:
> > On Mon, 11 Sept 2023 at 09:52, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > > On Thu, Aug 31, 2023 at 1:39 PM Ulf Hansson <ulf.hansson@...aro.org> wrote:
> > > > On Thu, 31 Aug 2023 at 11:33, Rafael J. Wysocki <rafael@...nel.org> wrote:
> > > > > If I may suggest something, I would call this "pmdomain" instead of
> > > > > "genpd".  I don't think that /drivers/power/ is a particularly
> > > > > suitable location for it, because it doesn't really have much to do
> > > > > with power supplies and more to do with device PM.
> > > >
> > > > "pmdomain" is probably giving a reasonable good hint of what goes on
> > > > in this subsystem. This works fine for me, thanks!
> > >
> > > > > Also, I would move drivers/base/power/domain.c to drivers/pmdomain/
> > > > > (and rename it to something like core.c), because it would be a better
> > > > > location for that fiile IMO.
> > > >
> > > > We could certainly do that, let's discuss it a bit more.
> > > >
> > > > Although, at this point I want to focus on the genpd providers, as to
> > > > release some of the burden from arm-soc maintainers.
> > > >
> > > > > I can also handle future pull requests for this if that's fine with everyone.
> > > >
> > > > Thanks a lot for your offer! However, if a re-route is preferred (I
> > > > think not?), this is probably better suited via arm-soc, as most
> > > > changes are going to be arm platform specific.
> > >
> > > Which brings me to the final question: what is the upstream path
> > > for changes to drivers/genpd/*/ (or whatever it's gonna be called)?
> > > Before, we sent PRs to (arm-)soc.  Do you expect us to send them to
> > > you? There's usually quite some interaction between drivers/soc/reneas/
> > > and drivers/genpd/renesas (and there are DT binding definitions),
> > > but not more than with e.g. drivers/clk/renesas/.
> >
> > I would be happy to pick this up and funnel this via my new genpd
> > tree. As long as it's coupled with changes affecting "genpd
> > providers", of course.
> >
> > I can certainly also collect patches directly from the
> > mailing-list/patch-tracker too. Whatever works for you the best. Of
> > course, in that case I need your acks before I pick up the relevant
> > patches.
> >
> > If we need "immutable" branches, let's discuss that on a case by case basis.
>
> At least for Renesas SoCs, every new SoC comes with a DT binding
> definitions file under include/dt-bindings/power/, to be shared by genpd
> driver and DTS (the same is true for clocks).  So PRs will work best.

Good point! And Neil pointed out this too [1].

I am going to host an immutable branch for the dt bindings that you
can pull in. Would that be a better option for you?

[...]

Kind regards
Uffe

[1]
https://lore.kernel.org/lkml/4303c141-30df-4a2b-aba7-f11a98db9941@linaro.org/