linux-kernel - Re: [PATCH v2 3/3] dt-bindings: hwinfo: Add mtk-socinfo driver

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Message-ID: <9acc8d99-e3db-3df8-4051-21d95450b28d@collabora.com>
Date:   Mon, 18 Sep 2023 10:47:53 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        William-tw Lin <william-tw.lin@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Kevin Hilman <khilman@...nel.org>
Cc:     Project_Global_Chrome_Upstream_Group@...iatek.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 3/3] dt-bindings: hwinfo: Add mtk-socinfo driver

Il 17/09/23 10:26, Krzysztof Kozlowski ha scritto:
> On 15/09/2023 17:26, William-tw Lin wrote:
>> dt-binding documentation for mtk-socinfo driver.
> 
> Here and in subject, drop driver and instead descrbe hardware.
> 
>> mtk-socinfo driver provides SoC-related information.
>> Such information includes manufacturer information, SoC name,
>> SoC segment name, and SoC marketing name.
>>
>> Signed-off-by: William-tw Lin <william-tw.lin@...iatek.com>
>> ---
>>   .../bindings/hwinfo/mtk-socinfo.yaml          | 48 +++++++++++++++++++
>>   1 file changed, 48 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/hwinfo/mtk-socinfo.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/hwinfo/mtk-socinfo.yaml b/Documentation/devicetree/bindings/hwinfo/mtk-socinfo.yaml
>> new file mode 100644
>> index 000000000000..74f03f1dc404
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/hwinfo/mtk-socinfo.yaml
> 
> Nothing improved.
> 
> This is a friendly reminder during the review process.
> 
> It seems my previous comments were not fully addressed. Maybe my
> feedback got lost between the quotes, maybe you just forgot to apply it.
> Please go back to the previous discussion and either implement all
> requested changes or keep discussing them.
> 
> Thank you.
> 
>> @@ -0,0 +1,48 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/hwinfo/mtk-socinfo.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: MediaTek SoC ChipID
>> +
>> +maintainers:
>> +  - William Lin <william-tw.lin@...iatek.com>
>> +  - Matthias Brugger <matthias.bgg@...il.com>
>> +  - Kevin Hilman <khilman@...nel.org>
>> +  - AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>> +
>> +description:
>> +  MediaTek SoCs store various product information in eFuses, including
>> +  Chip ID and Revision fields, usable to identify the manufacturer,
>> +  SoC version, plus segment and marketing names.
>> +
>> +properties:
>> +  compatible:
>> +    const: mediatek,socinfo
> 
> What happened to compatibles? No, this is just wrong and no explained.
> You ignored other comments as well. Really, that's not the way to go.
> 

Practically, having different compatibles for each SoC is not needed, as
the only thing that changes between SoCs is the eFuse(s) that you read to
get the information - and that's all.

So ... we either use this driver with devicetree, giving it the right eFuses
to read from, or we duplicate the mtk-efuse driver, or we statically assign
the eFuses in the driver itself and we set compatibles like
"mediatek,mt8195-socinfo" to select that... ideas?

Cheers,
Angelo

> NAK
> 
> Best regards,
> Krzysztof
>