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

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Message-ID: <CAMuHMdVxLkxN0bmSRXW74R_dGNDSRDB4Z=zE0DoiXDOuweSM0A@mail.gmail.com>
Date:   Mon, 11 Sep 2023 09:52:30 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Ulf Hansson <ulf.hansson@...aro.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

Hi Ulf,

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!

Sounds nice!
All of this lives in <linux/pm_domain.h> (with underscore?) anyway,
and "PM Domains" is the usual naming, as it covers both Power and
Clock Domains.

However, although I am quite familiar with genpd, I am still wondering
what is the meaning of the "generic" part in the name? And what is a
non-generic PM Domain?

> > 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/.

And I just realized you moved the code and Makefiles to drivers/genpd/,
but not the Kconfig symbols and logic, which still lives under
drivers/soc/.  So resolving that (and the name) is something that
should be resolved sooner rather than later...

Thanks!

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds