linux-kernel - Re: [PATCH 1/2] dt-bindings: arm: fsl: Add FRDM-IMX91S board

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Message-ID: <a252e741-aab3-4fec-ae8f-38634d071d77@kernel.org>
Date: Thu, 11 Dec 2025 02:16:55 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Yanan Yang <yanan.yang@....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, qijian.guo@....com,
 justin.jiang@....com
Subject: Re: [PATCH 1/2] dt-bindings: arm: fsl: Add FRDM-IMX91S board

On 10/12/2025 07:31, Yanan Yang wrote:
> On Fri, Dec 05, 2025 at 09:21:55AM +0100, Krzysztof Kozlowski wrote:
>> On 05/12/2025 09:03, Yanan.Yang wrote:
>>> Add DT compatible string for NXP FRDM-IMX91S board
>>>
>>> The FRDM i.MX 91S development board is an low-cost and compact
>>> development board featuring the i.MX 91 applications processor.
>>>
>>> Signed-off-by: Yanan.Yang <yanan.yang@....com>
>>
>> Are you sure your Latin name contains '.' character? Or you just copied
>> login?
>>
>>> ---
>>>  Documentation/devicetree/bindings/arm/fsl.yaml | 1 +
>>>  1 file changed, 1 insertion(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/arm/fsl.yaml b/Documentation/devicetree/bindings/arm/fsl.yaml
>>> index 68a2d5fecc43..82f28be401b8 100644
>>> --- a/Documentation/devicetree/bindings/arm/fsl.yaml
>>> +++ b/Documentation/devicetree/bindings/arm/fsl.yaml
>>> @@ -1412,6 +1412,7 @@ properties:
>>>          items:
>>>            - enum:
>>>                - fsl,imx91-11x11-evk       # i.MX91 11x11 EVK Board
>>> +              - fsl,imx91-11x11-frdm-s    # FRDM-IMX91S Board
>>
>> Anyway, this was sent, or something almost the same.
>>
>> Align internally before posting duplicates or at least explain why this
>> is not a duplicate It is not the job of the community to coordinate how
>> NXP employees should work. Srsly, it's NXP's job.
>>
> Hi Krzysztof,
> Thank you for your review and for pointing this out.
> 
> This patch set is not a duplicate of the FRDM-IMX91 series. It introduces
> support for a new board: FRDM-IMX91S. While FRDM-IMX91S is similar to
> FRDM-IMX91, there are hardware differences that require a separate DTS:
> 
> - 512MB LPDDR4 (FRDM-IMX91 uses 1GB)
> - 256MB FlexSPI-NAND (FRDM-IMX91 uses 8GB eMMC)
> - Single GbE port (FRDM-IMX91 has dual GbE)
> - PMIC PF9453 (FRDM-IMX91 uses PCA9451A)
> 
> These differences were described in the cover letter and commit message,
> but I can make them more explicit if needed.

I cannot find anything about it in commit msg. Look, you wrote:

"Add DT compatible string for NXP FRDM-IMX91S board

The FRDM i.MX 91S development board is an low-cost and compact
development board featuring the i.MX 91 applications processor."

so where is it? About cover letter, I usually do not read them, some
maintainers skip entirely.

Best regards,
Krzysztof