linux-kernel - Re: [PATCH v5 10/12] arm64: dts: qcom: sdm845-lg-judyln: Add lab/ibb

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Message-ID: <7909626f3116fcb9feb25b77820a98da56e1283a@postmarketos.org>
Date: Thu, 04 Dec 2025 18:47:32 +0000
From: "Paul Sajna" <sajattack@...tmarketos.org>
To: "Konrad Dybcio" <konrad.dybcio@....qualcomm.com>, "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>, "David Heidelberg" <david@...t.cz>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org,
 ~postmarketos/upstreaming@...ts.sr.ht, "Amir Dahan"
 <system64fumo@...a.io>, "Christopher Brown" <crispybrown@...il.com>
Subject: Re: [PATCH v5 10/12] arm64: dts: qcom: sdm845-lg-judyln: Add lab/ibb

December 4, 2025 at 12:50 PM, "Konrad Dybcio" <konrad.dybcio@....qualcomm.com mailto:konrad.dybcio@....qualcomm.com?to=%22Konrad%20Dybcio%22%20%3Ckonrad.dybcio%40oss.qualcomm.com%3E > wrote:


> 
> On 12/3/25 10:40 AM, Paul Sajna wrote:
> 
> > 
> > These regulators are required for the LCD
> >  
> >  Signed-off-by: Paul Sajna <sajattack@...tmarketos.org>
> >  ---
> >  arch/arm64/boot/dts/qcom/sdm845-lg-judyln.dts | 17 +++++++++++++++++
> >  1 file changed, 17 insertions(+)
> >  
> >  diff --git a/arch/arm64/boot/dts/qcom/sdm845-lg-judyln.dts b/arch/arm64/boot/dts/qcom/sdm845-lg-judyln.dts
> >  index 8b88f75b36af..cdaf84de5e6c 100644
> >  --- a/arch/arm64/boot/dts/qcom/sdm845-lg-judyln.dts
> >  +++ b/arch/arm64/boot/dts/qcom/sdm845-lg-judyln.dts
> >  @@ -56,10 +56,27 @@ zap-shader {
> >  };
> >  };
> >  
> >  +&ibb {
> >  + regulator-min-microvolt = <5500000>;
> >  + regulator-max-microvolt = <5700000>;
> > 
> These ranges seem much more reasonable, although I would still
> expect there's a single operational voltage - unless the panel driver
> is supposed to call regulator_set_voltage() in some different power
> modes?
> 
> Konrad
>

So min/max both 55? Or is there another property I should use?
I wasn't sure if that would be physically hard for the regulator to maintain such precision, so I cross-referenced some other DTs in the qcom folder and found this 200mv allowance in one of the sony devices.