Message-ID: <36cb7d6e-ece4-42c7-bc11-b66837df5fc4@kernel.org>
Date: Tue, 30 Dec 2025 08:21:27 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Yijie Yang <yijie.yang@....qualcomm.com>,
 Tingwei Zhang <tingwei.zhang@....qualcomm.com>, andersson@...nel.org,
 konradybcio@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, linux-arm-msm@...r.kernel.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 3/4] arm64: dts: qcom: Commonize IQ-X-IOT DTSI

On 29/12/2025 21:08, Dmitry Baryshkov wrote:
> On Mon, Dec 29, 2025 at 09:47:05AM +0100, Krzysztof Kozlowski wrote:
>> On 29/12/2025 08:38, Yijie Yang wrote:
>>>
>>>
>>> On 12/29/2025 3:21 PM, Krzysztof Kozlowski wrote:
>>>> On 29/12/2025 02:23, Tingwei Zhang wrote:
>>>>>
>>>>>
>>>>> On 12/24/2025 8:12 AM, Tingwei Zhang wrote:
>>>>>>
>>>>>> On 12/23/2025 9:41 PM, Krzysztof Kozlowski wrote:
>>>>>>> On 23/12/2025 04:38, Tingwei Zhang wrote:
>>>>>>>> On 12/22/2025 5:11 PM, Krzysztof Kozlowski wrote:
>>>>>>>>> On Mon, Dec 22, 2025 at 02:03:28PM +0800, YijieYang wrote:
>>>>>>>>>> From: Yijie Yang <yijie.yang@....qualcomm.com>
>>>>>>>>>>
>>>>>>>>>> HAMOA-IOT-EVK and PURWA-IOT-EVK share a similar board design. Extract
>>>>>>>>>> the common components into separate files for better maintainability.
>>>>>>>>> SoMs do not share actual hardware. DTSI does not represent what looks
>>>>>>>>> similar to you, but actually common parts.
>>>>>>>> Purwa SOM board and Hamoa SOM board share same design. They share same PCB.
>>>>>>>> The difference is only on chip. Purwa SOM board has Purwa and Hamoa SOM board
>>>>>>>> has Hamoa on it.
>>>>>>> I do not speak about boards. Read carefully feedback and respond to the
>>>>>>> actual feedback, not some other arguments.
>>>>>>>
>>>>>>> NAK
>>>>>> In this change, the SoM hardware except SoC is described by iq-x-iot-som.dtsi since it's common between Hamoa and Purwa. Hamoa and Purwa SoC hardware is described in hamoa.dtsi and purwa.dtsi. Hamoa-iot-som.dtsi includes iq-x-iot-som.dtsi and hamoa.dtsi. This change could reduce the duplicate code and review effort on a totally new purwa-iot-som.dtsi. If we found any bug, it can be fixed in one common file instead of two separate files. Same idea is used in x1-crd.dtsi. X1e80100-crd.dts include x1-crd.dtsi and hamoa.dtsi.
>>>>> Krzysztof,
>>>>> Please let me know your opinion on this. This could be a common case for
>>>>> Hamoa/Purwa boards share same PCB. Share same dtsi file like x1-crd.dtsi
>>>>
>>>> It's not the same PCB.  You did not really respond to my first message,
>>>> so I responded to you - I do not speak about boards. Then again you did
>>>> not respond to it and brought some irrelevant arguments.
>>>>
>>>>> would reduce maintenance effort.
>>>>
>>>> Does not matter, I do not question this. Why are you responding to some
>>>> questions which were never asked?
>>>>
>>>> DTSI represents actual shared physical aspect and you cannot share SoM
>>>> physically. It's not the same PCB, because you do not have a socket on
>>>> the SoM.
>>>
>>> x1e80100-crd and x1p42100-crd are different boards, yet they share the 
>>> same x1-crd.dtsi. Why can’t we apply the same approach here?
>>
>>
>> You should ask the authors there, not me. I presume that the baseboard
>> is the same or very similar. Or pieces of the baseboard are re-used
>> which could be visible in the schematics (same MCN numbers etc).
> 
> For me this sounds like a new rule, which didn't exist beforehand. We
> have enough foo-common.dtsi fragments, covering similar phones, but we
> never required the knowledge of those phones having the same PCB.

I am speaking about it since 2020? 2021? So how new? Other people in
other SoCs were sometimes speaking about it in 2016 or something

Best regards,
Krzysztof

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