linux-kernel - Re: [RFC PATCH v2 1/2] dt-bindings: soc: renesas: r9a07g043f-l2-cache: Add DT binding documentation for L2 cache controller

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Date:   Tue, 4 Oct 2022 08:59:19 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Conor Dooley <conor.dooley@...rochip.com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Heiko Stuebner <heiko@...ech.de>, Guo Ren <guoren@...nel.org>,
        Philipp Tomsich <philipp.tomsich@...ll.eu>,
        Nathan Chancellor <nathan@...nel.org>,
        Atish Patra <atishp@...osinc.com>,
        Anup Patel <apatel@...tanamicro.com>,
        linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [RFC PATCH v2 1/2] dt-bindings: soc: renesas: r9a07g043f-l2-cache:
 Add DT binding documentation for L2 cache controller

On Tue, Oct 4, 2022 at 8:32 AM Conor Dooley <conor.dooley@...rochip.com> wrote:
>
> On Tue, Oct 04, 2022 at 08:26:01AM +0100, Lad, Prabhakar wrote:
> > Hi Geert,
> >
> > Thank you for the review.
> >
> > On Tue, Oct 4, 2022 at 7:42 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > >
> > > Hi Prabhakar,
> > >
> > > On Tue, Oct 4, 2022 at 12:32 AM Prabhakar <prabhakar.csengg@...il.com> wrote:
> > > > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > > >
> > > > Add DT binding documentation for L2 cache controller found on RZ/Five SoC.
> > > >
> > > > The Renesas RZ/Five microprocessor includes a RISC-V CPU Core (AX45MP
> > > > Single) from Andes. The AX45MP core has an L2 cache controller, this patch
> > > > describes the L2 cache block.
> > > >
> > > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > >
> > > Thanks for your patch!
> > >
> > > > --- /dev/null
> > > > +++ b/Documentation/devicetree/bindings/soc/renesas/r9a07g043f-l2-cache.yaml
> > >
> > > Not andestech,ax45mp-cache.yaml?
> > >
> > I wasn't sure as we were including this in soc/renesas so named it as
> > r9a07g043f-l2-cache.yaml if there are no issues I'll rename it
> > andestech,ax45mp-cache.yaml.
>
> I may be guilty of suggesting soc/renesas in the first place, but should
> this maybe be in soc/andestech? I have no skin in the game, so at the
> end of the day it doesnt matter to me, but I would imagine that you're
> not going to be the only users of this l2 cache? Or is it a case of "we
> will deal with future users when said future users arrive"? But either
> way, naming it after the less specific compatible makes more sense to
> me.
>
As there aren't any Andestech SoCs upstream, I am in favour of keeping
in soc/renesas for maintenance. If in future there comes a new soc
from Andestech (which will go into soc/andestech) we will have to
split the maintenance work.
But anyway if there will be any users of L2 cache we could always
provide a config option which can be used by other SoCs.

Said that I'll let Geert decide on this.

Cheers,
Prabhakar