linux-kernel - Re: [PATCH 08/14] arm64: dts: qcom: sdm845-db845c: specify power for WiFi CH1

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Message-ID: <00b59998-33e2-450f-bdef-db370c5d6e59@oss.qualcomm.com>
Date: Wed, 31 Dec 2025 17:20:57 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bartosz Golaszewski <brgl@...nel.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Jeff Johnson <jjohnson@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Manivannan Sadhasivam <mani@...nel.org>, Vinod Koul <vkoul@...nel.org>,
        Balakrishna Godavarthi <quic_bgodavar@...cinc.com>,
        Matthias Kaehlcke <mka@...omium.org>, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-bluetooth@...r.kernel.org, linux-wireless@...r.kernel.org,
        ath10k@...ts.infradead.org, linux-pm@...r.kernel.org,
        Krzysztof Kozlowski <krzk@...nel.org>
Subject: Re: [PATCH 08/14] arm64: dts: qcom: sdm845-db845c: specify power for
 WiFi CH1

On 12/31/25 5:19 PM, Dmitry Baryshkov wrote:
> On Wed, Dec 31, 2025 at 01:09:49PM +0100, Konrad Dybcio wrote:
>> On 12/31/25 12:35 AM, Dmitry Baryshkov wrote:
>>> Specify power supply for the second chain / antenna output of the
>>> onboard WiFi chip.
>>>
>>> Fixes: 3f72e2d3e682 ("arm64: dts: qcom: Add Dragonboard 845c")
>>> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
>>> ---
>>
>> I don't have schematics nearby, but jfyi downstream doesn't do that
> 
> I checked in the schematics, it is L23A.
> 
>>
>>>  arch/arm64/boot/dts/qcom/sdm845-db845c.dts | 7 +++++++
>>>  1 file changed, 7 insertions(+)
>>>
>>> diff --git a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
>>> index ad283a79bcdb..5118b776a9bb 100644
>>> --- a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
>>> +++ b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
>>> @@ -379,6 +379,12 @@ vreg_l21a_2p95: ldo21 {
>>>  			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
>>>  		};
>>>  
>>> +		vreg_l23a_3p3: ldo23 {
>>> +			regulator-min-microvolt = <3300000>;
>>> +			regulator-max-microvolt = <3312000>;
>>
>> Do we benefit from the 0.012V spread?
>>
>> (i.e. is there anything else on this rail?)
> 
> I must admt jere, I just copied defition of the ch0 regulator. I think,
> they should be the same.

Alright

Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Konrad