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Message-ID: <68fd00b8-d6f1-463b-9d0d-b77bf9364f7f@linaro.org>
Date: Thu, 28 Mar 2024 10:41:50 +0100
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Subject: Re: [PATCH 1/2] dt-bindings: arm64: marvell: add solidrun cn9130
 clearfog boards
To: Josua Mayer <josua@solid-run.com>, Andrew Lunn <andrew@lunn.ch>,
 Gregory Clement <gregory.clement@bootlin.com>,
 Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
 Rob Herring <robh+dt@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Conor Dooley <conor+dt@kernel.org>
Cc: Yazan Shhady <yazan.shhady@solid-run.com>,
 "linux-arm-kernel@lists.infradead.org"
 <linux-arm-kernel@lists.infradead.org>,
 "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
 "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
References: <20240321-cn9130-som-v1-0-711127a409ae@solid-run.com>
 <20240321-cn9130-som-v1-1-711127a409ae@solid-run.com>
 <0f7ca0ed-a1c1-41d2-a1fa-27431d14c056@solid-run.com>
 <e1836cb6-64cd-4866-9c0a-f0dda096aa18@linaro.org>
 <6a6e7c4d-d5fd-42ae-bc3d-a3978d65e8e4@solid-run.com>
 <b086a02c-624f-4225-a9fb-164095742ce9@linaro.org>
 <6af08a38-5239-4f5f-9e87-108e3400a6e6@solid-run.com>
 <62242f04-c18d-4da0-bd40-1be26886e41a@linaro.org>
 <1153cdd4-ed86-4a1f-ae4d-d9da1161f763@solid-run.com>
 <539eaf79-cff5-4bb7-84c8-7c9943c6d8ae@linaro.org>
 <5ea0feb4-4d7e-4a10-9254-b034e368e8ad@solid-run.com>
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From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <5ea0feb4-4d7e-4a10-9254-b034e368e8ad@solid-run.com>
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On 28/03/2024 10:33, Josua Mayer wrote:
>>
>>> 2. 88F8215, SouthBridge Communication Processor, System on Chip
>>> (only usable in combination with a CN9130)
>>>
>>> Now, in terms of compatible string, what happens when a board
>>> has multiples of these?
>> Multiple of CN9130? 2x CN9130?
> this specifically is an academic question,
> the main point is multiple southbridges to one CN9130.

I did not know to what you refer.

>>
>> You <cut> should know what is this about and come
>> with explanation to the community.
> If I was to come up with something new, without looking at existing
> Documentation/devicetree/bindings/arm/marvell/armada-7k-8k.yaml
> I would describe the hardware like this:
> 
> SolidRun "CN9131" SolidWAN board is comptible with:
> - solidrun,cn9131-solidwan:
>   name of the carrier board, and name of the complete product
>   includes one southbridge chip, but I don't need to mention it?
> - solidrun,cn9130-sr-som:
>   just the som, including 1x CN9130 SoC
> - marvell,cn9130:
>   this is the SoC, internally combining AP+CP
>   AP *could* be mentioned, but I don't see a reason

With an explanation in commit msg about not using other compatible
fallbacks, this looks good to me.

> 
>> You<cut>r platform maintainers should know what is this about and come
>> with explanation to the community.
> Is there a way forward?
> Would it be worth challenging the existing bindings by proposing (RFC)
> specific changes in line with what I described above?

It all depends on "what" and "why" you want to do. I don't know.

Best regards,
Krzysztof