linux-kernel - Re: [PATCH 1/3] dt-bindings: arm: fsl: moduline-display: fix compatible

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Message-ID: <285a5651-b621-44ba-a06a-523f94e949b3@kernel.org>
Date: Mon, 17 Nov 2025 08:48:13 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Maud Spierings <maudspierings@...ontroll.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
 Sascha Hauer <s.hauer@...gutronix.de>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, imx@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/3] dt-bindings: arm: fsl: moduline-display: fix
 compatible

On 17/11/2025 08:33, Maud Spierings wrote:
> Hi Krzysztof,
> 
> Thanks for the review.
> 
> On 11/15/25 12:53, Krzysztof Kozlowski wrote:
>> On Fri, Nov 14, 2025 at 03:11:49PM +0100, Maud Spierings wrote:
>>> The compatibles should include the SoM compatible, this board is based
>>> on the Ka-Ro TX8P-ML81 SoM, so add it. Also add the hardware revision to
>>> the board compatible.
>>>
>>> This is a breaking change, but it is early enough that it can be
>>> corrected without causing any issues.
>>>
>>> Fixes: 24e67d28ef95 ("dt-bindings: arm: fsl: Add GOcontroll Moduline Display")
>>> Signed-off-by: Maud Spierings <maudspierings@...ontroll.com>
>>> ---
>>>   Documentation/devicetree/bindings/arm/fsl.yaml | 7 ++++++-
>>>   1 file changed, 6 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/arm/fsl.yaml b/Documentation/devicetree/bindings/arm/fsl.yaml
>>> index 21b7168d61f5..8949a98acd87 100644
>>> --- a/Documentation/devicetree/bindings/arm/fsl.yaml
>>> +++ b/Documentation/devicetree/bindings/arm/fsl.yaml
>>> @@ -1105,7 +1105,6 @@ properties:
>>>                 - gateworks,imx8mp-gw74xx   # i.MX8MP Gateworks Board
>>>                 - gateworks,imx8mp-gw75xx-2x # i.MX8MP Gateworks Board
>>>                 - gateworks,imx8mp-gw82xx-2x # i.MX8MP Gateworks Board
>>> -              - gocontroll,moduline-display # GOcontroll Moduline Display controller
>>>                 - prt,prt8ml             # Protonic PRT8ML
>>>                 - skov,imx8mp-skov-basic # SKOV i.MX8MP baseboard without frontplate
>>>                 - skov,imx8mp-skov-revb-hdmi # SKOV i.MX8MP climate control without panel
>>> @@ -1163,6 +1162,12 @@ properties:
>>>             - const: engicam,icore-mx8mp             # i.MX8MP Engicam i.Core MX8M Plus SoM
>>>             - const: fsl,imx8mp
>>>   
>>> +      - description: Ka-Ro TX8P-ML81 SoM based boards
>>> +        items:
>>> +          - const: gocontroll,moduline-display-106
>>
>> You need old compatible here as well, you cannot drop it.
> 
> The old compatible should stay in the above section then right? Because 
> the old compatible never matched the pattern with the SoM compatible. 
> Should/can I add some deprecated tag to it then?

You could deprecate old list but there is little benefit of it, but the
point is that your final (new) list must include old compatible because
otherwise it is a potential ABI break.



Best regards,
Krzysztof