linux-kernel - Re: [PATCH v2 1/2] clk: renesas: rzg2l: Don't assume all CPG

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Message-ID: <CA+V-a8sySpYZ4fAsNNc9aEzDL4v+8G3XB71KZt72nADnscUVhg@mail.gmail.com>
Date:   Wed, 26 Oct 2022 09:48:43 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        linux-renesas-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v2 1/2] clk: renesas: rzg2l: Don't assume all CPG_MOD
 clocks support PM

HI Geert,

Thank you for the review.

On Wed, Oct 26, 2022 at 8:56 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Wed, Oct 26, 2022 at 3:42 AM Prabhakar <prabhakar.csengg@...il.com> wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > There are cases where not all CPG_MOD clocks should be assumed to support
> > PM. For example on the CRU block there is a particular sequence that needs
> > to be followed to initialize the CSI-2 D-PHY in which individual clocks
> > need to be turned ON/OFF, due to which Runtime PM support wasn't used by
> > the CRU CSI-2 driver.
> >
> > This patch adds support to allow indicating if PM is not supported by the
> > CPG_MOD clocks. Two new members no_pm_mod_clks and num_no_pm_mod_clks are
> > added to struct rzg2l_cpg_info so that MOD clocks which do not support PM
> > can be passed by no_pm_mod_clks[] array and when the driver uses Runtime
> > PM support the clk ID is matched against the no_pm_mod_clks[] array to see
> > if the clk is needed to be included as part of Runtime PM.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> > v1->v2
> > * Dropped DEF_NO_PM() macro
> > * Added genpd member to struct rzg2l_cpg_priv
> > * Added no_pm_mod_clks and num_no_pm_mod_clks members
> >   to struct rzg2l_cpg_info
> > * Updated commit message
>
> Thanks for the update!
>
> > --- a/drivers/clk/renesas/rzg2l-cpg.c
> > +++ b/drivers/clk/renesas/rzg2l-cpg.c
>
> >
> >  static int rzg2l_cpg_attach_dev(struct generic_pm_domain *unused, struct device *dev)
>
> Time to rename "unused" to "domain" ;-)
>
Indeed, I think the naming came from R-Car :)

> >  {
> > +       struct rzg2l_cpg_priv *priv = container_of(unused, struct rzg2l_cpg_priv, genpd);
>
> I can fix that while applying...
>
Thanks.

> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
>

Cheers,
Prabhakar