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

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Message-ID: <9b3f2adc-bd64-4f6f-8a40-9e2884e46782@oss.qualcomm.com>
Date: Fri, 5 Dec 2025 11:35:10 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Paul Sajna <sajattack@...tmarketos.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>, 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

On 12/4/25 7:47 PM, Paul Sajna wrote:
> 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.

These regulators are very accurate - set it to 5.5

Konrad