linux-kernel - Re: [PATCH 1/1] dt-bindings: arm: lpc: add missed lpc43xx board

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Message-ID: <f3f72ade-1ead-46e7-b420-82e8a921bc55@kernel.org>
Date: Tue, 3 Jun 2025 08:49:19 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Frank Li <Frank.li@....com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
 Alexander Stein <alexander.stein@...tq-group.com>,
 Marek Vasut <marex@...x.de>, Peng Fan <peng.fan@....com>,
 Michael Walle <mwalle@...nel.org>, Fabio Estevam <festevam@...x.de>,
 Markus Niebel <Markus.Niebel@...group.com>,
 Frieder Schrempf <frieder.schrempf@...tron.de>,
 Francesco Dolcini <francesco.dolcini@...adex.com>,
 Max Merchel <Max.Merchel@...tq-group.com>, Tim Harvey
 <tharvey@...eworks.com>,
 "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
 <devicetree@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>,
 imx@...ts.linux.dev
Subject: Re: [PATCH 1/1] dt-bindings: arm: lpc: add missed lpc43xx board

On 03/06/2025 00:19, Frank Li wrote:
> On Mon, Jun 02, 2025 at 06:17:49PM +0200, Krzysztof Kozlowski wrote:
>> On 02/06/2025 16:06, Frank Li wrote:
>>> Add missed legancy lpc43xx board compatible string to fix below CHECK_DTB
>>
>> typo: legacy
>>
>>> warnings:
>>> arch/arm/boot/dts/nxp/lpc/lpc4337-ciaa.dtb: /: failed to match any schema with compatible: ['ciaa,lpc4337', 'nxp,lpc4337', 'nxp,lpc4350']
>>
>>
>>>
>>> Signed-off-by: Frank Li <Frank.Li@....com>
>>> ---
>>>  .../devicetree/bindings/arm/fsl.yaml          | 23 +++++++++++++++++++
>>>  1 file changed, 23 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/arm/fsl.yaml b/Documentation/devicetree/bindings/arm/fsl.yaml
>>> index d3b5e6923e416..75e46ffe9ba8c 100644
>>> --- a/Documentation/devicetree/bindings/arm/fsl.yaml
>>> +++ b/Documentation/devicetree/bindings/arm/fsl.yaml
>>> @@ -1711,6 +1711,29 @@ properties:
>>>                - traverse,ten64            # Ten64 Networking Appliance / Board
>>>            - const: fsl,ls1088a
>>>
>>> +      - description: lpc based Boards
>>> +        items:
>>> +          - enum:
>>> +              - ea,lpc4357-developers-kit
>>> +              - ciaa,lpc4337
>>> +          - enum:
>>> +              - nxp,lpc4337
>>> +              - nxp,lpc4357
>>
>> This feels wrong. Why 4337-based board is compatible with 4357 SoC? If
>> this was intentional either DTS is wrong or commit msg needs explanation.
> 
> I think it is that legacy board dts mess up. I am okay to fix boards's dts.
> but I have not hardware to test such changes. There are some risk to toggle
> such old boards, such as the uboot may check these comaptible string to do
> some fixup. Anyways, these boards is too old.
> 
> Do you think it worth to fix dts by take some little risk.
Well, I do not see ea,lpc4357-developers-kit with 4337 fallback, so I
don't understand what existing DTS. If you mean out of tree DTS, it's
their problem.

Best regards,
Krzysztof