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

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Date:   Wed, 27 Jul 2022 11:31:10 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>
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 1/6] dt-bindings: arm: renesas: Ignore the schema for
 RISC-V arch

On 27/07/2022 11:00, Lad, Prabhakar wrote:
> Hi Krzysztof,
> 
> 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.

Best regards,
Krzysztof