linux-kernel - Re: [PATCH] arm64: dts: renesas: r9a07g044: Add missing GICv3 node properties

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Message-ID: <CAMuHMdUg5v3qsFQsg783nC=o_BL3pL6YqqQphGQHHOaCeakj5Q@mail.gmail.com>
Date:   Tue, 13 Jul 2021 10:30:36 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Cc:     Sudeep Holla <sudeep.holla@....com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Rob Herring <robh+dt@...nel.org>,
        Magnus Damm <magnus.damm@...il.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH] arm64: dts: renesas: r9a07g044: Add missing GICv3 node properties

Hi Prabhakar,

On Tue, Jul 13, 2021 at 10:22 AM Lad, Prabhakar
<prabhakar.csengg@...il.com> wrote:
> On Tue, Jul 13, 2021 at 9:08 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > On Mon, Jun 14, 2021 at 2:48 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > > On Fri, Jun 11, 2021 at 5:21 PM Lad Prabhakar
> > > <prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> > > > Add the below missing properties into GIC node,
> > > > - clocks
> > > > - clock-names
> > > > - power-domains
> > > > - resets
> > > >
> > > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > > > Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
> > >
> > > Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> > >
> > > Queueing pending on[1].
> > >
> > > > [1] https://lore.kernel.org/linux-devicetree/
> > > >     20210609155108.16590-1-prabhakar.mahadev-lad.rj@...renesas.com/
> >
> > The dependency has been accepted, but this patch needs a respin
> > for the changed clocks.
> >
> Thank you for pointing this out. wrt resets the GIC has two signals
> (which I learnt lately when the dependency path was accepted). Earlier
> discussion in irc with Sudeep pointed out that there wouldn't be any
> use case of having GIC resets in DTSI, so either we drop the resets
> property in DT binding doc or correct it.
>
> Let me know your thoughts on this and how we proceed further.

DT Rule #1: DT describes hardware not software policy.

And a possible use case: the RT CPU core may want to reset the AP GIC.

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