linux-kernel - Re: [RFC PATCH v2] arm64: dts: qcom: sm8750-mtp: Add WiFi and Bluetooth

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Message-ID: <3239685a-97af-4d56-a0cc-984f26db5f76@linaro.org>
Date: Tue, 12 Aug 2025 13:07:20 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2] arm64: dts: qcom: sm8750-mtp: Add WiFi and
 Bluetooth

On 12/08/2025 13:00, Dmitry Baryshkov wrote:
> On Mon, Aug 11, 2025 at 04:40:09PM +0200, Krzysztof Kozlowski wrote:
>> On 11/08/2025 16:33, Dmitry Baryshkov wrote:
>>> On Mon, Aug 11, 2025 at 04:25:47PM +0200, Krzysztof Kozlowski wrote:
>>>> On 11/08/2025 16:22, Dmitry Baryshkov wrote:
>>>>> On Mon, Aug 11, 2025 at 03:10:56PM +0200, Krzysztof Kozlowski wrote:
>>>>>> MTP8750 rev 2.0 (power grid v8) boards come as two different variants
>>>>>> with different WiFi chips: WCN7850 and WCN786x.  WCN7850 is already
>>>>>> supported by the kernel, but WCN786x is not.  Both of the board variants
>>>>>> are considered newest revisions and the difference is only in MCN
>>>>>> numbers and internal codenames.
>>>>>
>>>>> Are they soldered on board, installed via add-on cards or installed via
>>>>> M.2 slot?
>>>>
>>>> This is MTP, so same answer as other MTPs - these are replaceable parts,
>>>> just like you can replace display or modem.
>>>>
>>>>>
>>>>> Are they going to be somewhat compatible (e.g. on the BT side?)
>>>>
>>>> No clue, you need to ask Qualcomm people - it's their hardware.
>>>
>>> And you (hopefully) have access to the docs.
>>
>>
>> No, fought with that for 1 year, got some basic docs only. It is very
>> difficult to get any access to these docs. I assume you mean the MTP board.
>>
>> If you mean Bluetooth or WiFi - I have 0 access there.
> 
> I mean WiFi / BT. Then you can ask Jeff or a corresponding BT maintainer
> to provide necessary details. You make it sound as if you are not a part
> of the system. You are. You can talk to necessary people within
> Qualcomm.


This feels like creating obstacles and some new sort of requests that
contributor for hardware A has to come with answers about completely
different new hardware B, so please provide rationale for such request.

I see no reason why compatibility between bluetooth of WCN7850 and
WCN786x is relevant here. Even if I knew the compatibility or
differences between WCN7850 and new WCN786x, I cannot publicly speak
about them.

Devices will be different, they will have different compatibles, thus
you CANNOT have one DTS for both. What else - not my task, not my
expertise, not relevant to this submission.

Best regards,
Krzysztof