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

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Message-ID: <brzdqbu3uiy3gd5a2uyzcgx24wvuhjrrs3fs5b4qbnj5jvmra3@rfbiy5kgwlbn>
Date: Wed, 31 Dec 2025 18:19:55 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....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 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.

> 
> Konrad

-- 
With best wishes
Dmitry