linux-kernel - Re: [PATCH 1/6] dt-bindings: arm: renesas: Ignore the schema for RISC-V arch

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Date:   Thu, 11 Aug 2022 17:26:32 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH 1/6] dt-bindings: arm: renesas: Ignore the schema for
 RISC-V arch

Hi Prabhakar,

On Wed, Jul 27, 2022 at 11:48 AM Lad, Prabhakar
<prabhakar.csengg@...il.com> wrote:
> On Wed, Jul 27, 2022 at 10:31 AM Krzysztof Kozlowski
> <krzysztof.kozlowski@...aro.org> wrote:
> > On 27/07/2022 11:00, Lad, Prabhakar wrote:
> > > On Wed, Jul 27, 2022 at 9:53 AM Krzysztof Kozlowski
> > > <krzysztof.kozlowski@...aro.org> wrote:
> > >> On 26/07/2022 20:06, Lad Prabhakar wrote:
> > >>> Ignore the ARM renesas.yaml schema if the board is RZ/Five SMARC EVK
> > >>> (RISC-V arch).
> > >>>
> > >>> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > >>> ---
> > >>>  Documentation/devicetree/bindings/arm/renesas.yaml | 9 +++++++++
> > >>>  1 file changed, 9 insertions(+)
> > >>>
> > >>> diff --git a/Documentation/devicetree/bindings/arm/renesas.yaml b/Documentation/devicetree/bindings/arm/renesas.yaml
> > >>> index ff80152f092f..f646df1a23af 100644
> > >>> --- a/Documentation/devicetree/bindings/arm/renesas.yaml
> > >>> +++ b/Documentation/devicetree/bindings/arm/renesas.yaml
> > >>> @@ -9,6 +9,15 @@ title: Renesas SH-Mobile, R-Mobile, and R-Car Platform Device Tree Bindings
> > >>>  maintainers:
> > >>>    - Geert Uytterhoeven <geert+renesas@...der.be>
> > >>>
> > >>> +# We want to ignore this schema if the board is of RISC-V arch
> > >>> +select:
> > >>> +  not:
> > >>> +    properties:
> > >>> +      compatible:
> > >>> +        contains:
> > >>> +          items:
> > >>> +            - const: renesas,r9a07g043f01
> > >>
> > >> Second issue - why not renesas,r9a07g043?
> > >>
> > > We have two R9A07G043 SOC'S one is based on ARM64 and other on RISC-V.
> > >
> > > RZ/G2UL ARM64:
> > > Type-1 Part Number: R9A07G043U11GBG#BC0
> > > Type-2 Part Number: R9A07G043U12GBG#BC0
> > >
> > > RZ/Five RISCV:
> > > 13 x 13 mm Package Part Number: R9A07G043F01GBG#BC0
> > >
> > > So to differentiate in ARM schema I am using  renesas,r9a07g043f01.
> >
> > What is the point to keep then r9a07g043 fallback? The two SoCs are not
> > compatible at all, so they must not use the same fallback.
> >
> Agreed, I wanted to keep it consistent with what was done with ARM64
> (since both the SoCs shared R9A07G043 part number).
>
> Geert - What are your thoughts on the above?

"renesas,r9a07g043" is the CPU-less SoC base containing I/O devices.
"renesas,r9a07g043f01", "renesas,r9a07g043u11", and
"renesas,r9a07g043u12" are SoCs built by integrating one or more
RV64 or ARM64 CPU cores and the related interrupt controllers with
the CPU-less SoC base.

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