linux-kernel - Re: [PATCH 4/6] dt-bindings: riscv: Add DT binding documentation for Renesas RZ/Five SoC and SMARC EVK

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Date:   Wed, 27 Jul 2022 12:37:50 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        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 4/6] dt-bindings: riscv: Add DT binding documentation for
 Renesas RZ/Five SoC and SMARC EVK

Hi Krzysztof,

On Wed, Jul 27, 2022 at 11:09 AM Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 27/07/2022 12:06, Lad, Prabhakar wrote:
> > Hi Krzysztof,
> >
> > On Wed, Jul 27, 2022 at 10:54 AM Krzysztof Kozlowski
> > <krzysztof.kozlowski@...aro.org> wrote:
> >>
> >> On 27/07/2022 11:05, Lad, Prabhakar wrote:
> >>> Hi Krzysztof,
> >>>
> >>> Thank you for the review.
> >>>
> >>> On Wed, Jul 27, 2022 at 9:54 AM Krzysztof Kozlowski
> >>> <krzysztof.kozlowski@...aro.org> wrote:
> >>>>
> >>>> On 26/07/2022 20:06, Lad Prabhakar wrote:
> >>>>> Document Renesas RZ/Five (R9A07G043) SoC and SMARC EVK based on this SoC.
> >>>>>
> >>>>> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >>>>> ---
> >>>>>  .../devicetree/bindings/riscv/renesas.yaml    | 49 +++++++++++++++++++
> >>>>>  1 file changed, 49 insertions(+)
> >>>>>  create mode 100644 Documentation/devicetree/bindings/riscv/renesas.yaml
> >>>>>
> >>>>> diff --git a/Documentation/devicetree/bindings/riscv/renesas.yaml b/Documentation/devicetree/bindings/riscv/renesas.yaml
> >>>>> new file mode 100644
> >>>>> index 000000000000..f72f8aea6a82
> >>>>> --- /dev/null
> >>>>> +++ b/Documentation/devicetree/bindings/riscv/renesas.yaml
> >>>>> @@ -0,0 +1,49 @@
> >>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> >>>>> +%YAML 1.2
> >>>>> +---
> >>>>> +$id: http://devicetree.org/schemas/riscv/renesas.yaml#
> >>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> >>>>> +
> >>>>> +title: Renesas RZ/Five Platform Device Tree Bindings
> >>>>> +
> >>>>> +maintainers:
> >>>>> +  - Geert Uytterhoeven <geert+renesas@...der.be>
> >>>>> +  - Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >>>>> +
> >>>>> +# We want to ignore this schema if the board is SMARC EVK based on ARM64 arch
> >>>>> +select:
> >>>>> +  not:
> >>>>> +    properties:
> >>>>> +      compatible:
> >>>>> +        contains:
> >>>>> +          items:
> >>>>
> >>>> I think you should rather ignore the RiscV SoCs, not specific board.
> >>>>
> >>> You mean to ignore ARM/64 SoCs?
> >>>
> >>> Agreed just the below enum, should do the trick.
> >>>
> >>>             - enum:
> >>>                 - renesas,r9a07g043u11
> >>>                 - renesas,r9a07g043u12
> >>>                 - renesas,r9a07g044c1
> >>>                 - renesas,r9a07g044c2
> >>>                 - renesas,r9a07g044l1
> >>>                 - renesas,r9a07g044l2
> >>>                 - renesas,r9a07g054l1
> >>>                 - renesas,r9a07g054l2
> >>>
> >>>
> >>>>> +            - const: renesas,smarc-evk
> >>>>> +            - enum:
> >>>>> +                - renesas,r9a07g043u11
> >>>>> +                - renesas,r9a07g043u12
> >>>>> +                - renesas,r9a07g044c1
> >>>>> +                - renesas,r9a07g044c2
> >>>>> +                - renesas,r9a07g044l1
> >>>>> +                - renesas,r9a07g044l2
> >>>>> +                - renesas,r9a07g054l1
> >>>>> +                - renesas,r9a07g054l2
> >>>>> +            - enum:
> >>>>> +                - renesas,r9a07g043
> >>>>> +                - renesas,r9a07g044
> >>>>> +                - renesas,r9a07g054
> >>>>
> >>>> Did you actually test that it works and properly matches?
> >>>>
> >>> Yes I have run the dtbs_check and dt_binding _check for ARM64 and
> >>> RISC-V. Do you see any cases where it can fail?
> >>
> >>
> >> Just remove the renesas,smarc-evk2 from
> >> arch/arm64/boot/dts/renesas/r9a07g043u11-smarc.dts. Do you see the
> >> error? Not from this schema. The only error you will see is that no
> >> matching schema was found.
> >>
> > I did run the dtbs_check test as per your suggestion (below is the
> > log) and didn't see "no matching schema error"
> >
>
> So you do not see any errors at all. Then it does not work, does it?
>
Right I reverted my changes I can see it complaining, dtb_check seems
to have returned false positive in my case.

What approach would you suggest to ignore the schema here?

Cheers,
Prabhakar