linux-kernel - Re: [PATCH 2/3] dt-bindings: arm: Add SolidRun LX2162A SoM & Clearfog Board

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Message-ID: <f6283bf7-2c38-8257-e430-d17dd4dd233b@linaro.org>
Date:   Fri, 16 Jun 2023 18:59:16 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Josua Mayer <josua@...id-run.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Li Yang <leoyang.li@....com>, Marek Vasut <marex@...x.de>,
        Fabio Estevam <festevam@...x.de>,
        Stefan Wahren <stefan.wahren@...rgebyte.com>,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Andreas Kemnade <andreas@...nade.info>
Subject: Re: [PATCH 2/3] dt-bindings: arm: Add SolidRun LX2162A SoM & Clearfog
 Board

On 16/06/2023 15:32, Josua Mayer wrote:
> HI Krzysztof,
> 
> Am 16.06.23 um 14:36 schrieb Krzysztof Kozlowski:
>> On 16/06/2023 13:06, Josua Mayer wrote:
>>> Add DT compatible for SolidRun LX2162A SoM and Clearfog board.
>>>
>>> Signed-off-by: Josua Mayer <josua@...id-run.com>
>>> ---
>>>   Documentation/devicetree/bindings/arm/fsl.yaml | 2 ++
>>>   1 file changed, 2 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/arm/fsl.yaml b/Documentation/devicetree/bindings/arm/fsl.yaml
>>> index 15d411084065..438a4ece8157 100644
>>> --- a/Documentation/devicetree/bindings/arm/fsl.yaml
>>> +++ b/Documentation/devicetree/bindings/arm/fsl.yaml
>>> @@ -1373,9 +1373,11 @@ properties:
>>>         - description: SolidRun LX2160A based Boards
>>>           items:
>>>             - enum:
>>> +              - solidrun,clearfog
>>>                 - solidrun,clearfog-cx
>>>                 - solidrun,honeycomb
>>>             - const: solidrun,lx2160a-cex7
>>> +          - const: solidrun,lx2162a-som
>>>             - const: fsl,lx2160a
>> You change existing entries, breaking boards and changing the meaning,
>> without any explanation in commit msg. That's not how it is done. Please
>> provide rationale in commit msg.
> 
> I'm sorry. Given your comment I think I did not understand how these 
> entries are supposed to work.
> So perhaps you can provide some guidance based on my explanation?:
> 
> - NXP LX2162 is a smaller physical package of the same LX2160 SoC, with 
> reduced IOs and some silicon blocks disabled.
> - SolidRun LX2162 SoM is essentially a different form factor of LX2160 CEX
> - SolidRun LX2162 Clearfog is the reference platform for the SoM. 
> Despite it's naming similarity to clearfog-cx, it has a different 
> feature set more similar to SolidRun Armada 388 Clearfog Pro
> 
> So I believed I could just add to the existing entry "SolidRun LX2160A 
> based Boards" also the new LX2162 Board & SoM.

But you added much more, didn't you?

> I see now that adding a fourth const messes upthe existing 3-part 
> compatible for those already existing boards.
> 
> Please can you confirm if it would have been more correct to replace 
> "const: solidrun,lx2160a-cex7" with an enum?:
> enum:
>    - solidrun,lx2160a-cex7
>    - solidrun,lx2162a-som
> 
> Finally, is it okay to add a "solidrun,clearfog" given my explanation 
> above, or should it be more specific "solidrun,lx2162a-clearfog"?
> 

Test the binding and test DTS against it:
Please run `make dtbs_check` (see
Documentation/devicetree/bindings/writing-schema.rst for instructions).
https://www.linaro.org/blog/tips-and-tricks-for-validating-devicetree-sources-with-the-devicetree-schema/

It might point you to answer.

Why do you make solidrun,honeycomb compatible with cex7 and som?

Best regards,
Krzysztof