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

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Message-ID: <3jrs5gkxzjgrjmfbd65qr3uzblzzz5ae4apo5qwpxb63jm4i23@jzpaxp3dxais>
Date: Tue, 12 Aug 2025 15:45:24 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
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 Tue, Aug 12, 2025 at 01:07:20PM +0200, Krzysztof Kozlowski wrote:
> 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.

It was you, who mentioned WCN786x and you didn't mention that it's a
not-yet-available hardware. So, how would I guess that?

> 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.

Them having different compatibles is exactly my question. It's not
obvious if they are compatible or not.

We've discussed this offline and I hope that the next iteration will
cover all these details.

-- 
With best wishes
Dmitry