linux-kernel - Re: [PATCH 00/10] Fix up WCN6855 RFA power supply name

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Message-ID: <4d66229b-5d27-41bc-950f-534d489a8371@oss.qualcomm.com>
Date: Mon, 8 Dec 2025 13:29:40 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Bartosz Golaszewski <brgl@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>,
        linux-arm-msm@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jeff Johnson <jeff.johnson@....qualcomm.com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Marcel Holtmann <marcel@...tmann.org>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Rob Herring
 <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Balakrishna Godavarthi <quic_bgodavar@...cinc.com>,
        Rocky Liao <quic_rjliao@...cinc.com>,
        Bjorn Andersson <andersson@...nel.org>
Subject: Re: [PATCH 00/10] Fix up WCN6855 RFA power supply name

On 12/6/25 11:36 AM, Bartosz Golaszewski wrote:
> On Fri, 5 Dec 2025 13:47:19 +0100, Konrad Dybcio <konradybcio@...nel.org> said:
>> Commit 5f4f954bba12 ("dt-bindings: bluetooth: bring the HW description
>> closer to reality for wcn6855") renamed the supply representing the
>> VDD17_PMU_RFA leg to mention "1p8" instead.
>>
>> While the supply's voltage is normally 1.8 V, the bindings should
>> reflect the actual naming of the pin. Moreover, almost all DTs define
>> the output as 1p7, so that ends up looking a little odd..
>>
>> Ultimately, this is a "fake" regulator that is consumed for the sake
>> of DT sanity and this series is meant to bring uniformity and squash
>> checker errors.
>>
>> The last patch fixes up a less-trivial warning.
>> sc8280xp-microsoft-arcata is left out because I don't know whether the
>> mounting of the chip is on-board or as an M.2-y card (although I would
>> guesstimate the prior).
>>
>> Depends on the long-ready-for-the-merge series by Krzysztof (per-chip
>> bindings split of qualcomm-bluetooth.yaml), mentioned below
>>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
>> ---
> 
> I want to belive there was a reason for it but I no longer remember. :( Is it
> possible the schematics for the lenovo X13s laptop had it described as 1p7?

I think I checked the schematics of an add-in card used with Makena
and Lemans designs and the WCN6855 datasheet.

At the end of the day, one could argue for both levels but let's just
have one!

Thanks for the rb!

Konrad