linux-kernel - Re: [PATCH] PM: domains: Don't attach a device to genpd that corresponds to a provider

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Message-ID: <CAMuHMdU0AVFVb3tXW4wkEibSx50nzYKW1GopgZPfKp1SS7Mf1g@mail.gmail.com>
Date:   Fri, 9 Jul 2021 15:06:48 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Linux PM list <linux-pm@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Saravana Kannan <saravanak@...gle.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Kevin Hilman <khilman@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PM: domains: Don't attach a device to genpd that
 corresponds to a provider

Hi Ulf,

Thanks for your patch!

On Fri, Jul 9, 2021 at 2:56 PM Ulf Hansson <ulf.hansson@...aro.org> wrote:
> According to the common power domain DT bindings, a power domain provider
> must have a "#power-domain-cells" property in its OF node. Additionally, if
> a provider has a "power-domains" property, it means that it has a parent
> domain.

OK.

> It has turned out that some OF nodes that represents a genpd provider may
> also be compatible with a regular platform device. This leads to, during
> probe, genpd_dev_pm_attach(), genpd_dev_pm_attach_by_name() and
> genpd_dev_pm_attach_by_id() tries to attach the corresponding struct device
> to the genpd provider's parent domain, which is wrong. Instead the genpd

Why is that wrong?

> provider should only assign a parent domain, through
> pm_genpd_add_subdomain() or of_genpd_add_subdomain().

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