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 14:36:59 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Biju Das <biju.das.jz@...renesas.com>,
        "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Cc:     Prabhakar Mahadev Lad <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>
Subject: Re: [PATCH 4/6] dt-bindings: riscv: Add DT binding documentation for
 Renesas RZ/Five SoC and SMARC EVK

On 27/07/2022 14:21, Biju Das wrote:
> Hi,
> 
>> Subject: Re: [PATCH 4/6] dt-bindings: riscv: Add DT binding
>> documentation for Renesas RZ/Five SoC and SMARC EVK
>>
>> On 27/07/2022 13:37, Lad, Prabhakar wrote:
>>>>>>
>>>>> 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?
>>
>> I don't think currently it would work with your approach. Instead, you
>> should select here all SoCs which the schema should match.
>>
>> This leads to my previous concern - you use the same SoC compatible for
>> two different architectures and different SoCs: ARMv8 and RISC-V.
> 
> Or is it same SoC(R9A07G043) based on two different CPU architectures (ARMv8 and RISC-V)

Then it is not the same SoC! Same means same, identical. CPU
architecture is one of the major differences, which means it is not the
same.

> Using same SoM and Carrier board?

It's like saying PC with x86 and ARMv8 board are the same because they
both use same "PC chassis".

Best regards,
Krzysztof