linux-kernel - Re: [PATCH v2 4/4] arm64: dts: qcom: Add base HAMOA-IOT-EVK board

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Message-ID: <c28b7ee4-e438-41c8-8033-6ca94a096dc5@oss.qualcomm.com>
Date: Fri, 25 Jul 2025 11:39:56 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Yijie Yang <yijie.yang@....qualcomm.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        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>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/4] arm64: dts: qcom: Add base HAMOA-IOT-EVK board

On 7/25/25 11:36 AM, Yijie Yang wrote:
> 
> 
> On 2025-07-25 17:18, Krzysztof Kozlowski wrote:
>> On 25/07/2025 11:01, Yijie Yang wrote:
>>>
>>> wcn7850_pmu: wcn7850-pmu@...x {
>>>       compatible = "qcom,wcn7850-pmu";
>>>       reg = <0x...>;
>>>       vdd-supply = <&dummy_reg>;
>>>       vddaon-supply = <&dummy_reg>;
>>>       vdddig-supply = <&dummy_reg>;
>>>       vddrfa1p2-supply = <&dummy_reg>;
>>>       vddrfa1p8-supply = <&dummy_reg>;
>>> };
>>> This approach ensures the DTB passes schema checks while keeping the
>>> implementation clean and consistent with the actual platform setup. Do
>>> you think this is appropriate?
>>
>> No. There is no dummy regulator in the hardware, so you cannot add it to
>> the DTS.
> 
> What should I do in this case? Is it acceptable to deviate from the dt-binding rules due to differences in firmware behavior? Otherwise, I’ll need to revert to the first version, leave a TODO in the DTS, and wait for someone to properly model the M.2 card.

The reason we describe the regulators is so that the Wi-Fi can be
powered off and back on. Please don't invent any hacks.

Konrad