linux-kernel - Re: [PATCH v4 10/12] arm64: dts: qcom: sdm845-lg-judyln: Add lab/ibb

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Message-ID: <09e5d84c-39b7-45a9-b7d7-9beb54fb2f3f@oss.qualcomm.com>
Date: Mon, 1 Dec 2025 13:38:21 +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,
        Amir Dahan <system64fumo@...tonmail.com>,
        Christopher Brown <crispybrown@...il.com>
Subject: Re: [PATCH v4 10/12] arm64: dts: qcom: sdm845-lg-judyln: Add lab/ibb

On 11/25/25 9:12 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 a61f7bd65a7a..3188334d269b 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 = <4600000>;
> +	regulator-max-microvolt = <6000000>;

Sorry for not responding earlier, you can retrieve the actual volt
numbers from the hardware by reading

PMI8998_IBB_REG_BASE + REG_LABIBB_VOLTAGE = 0xdc41

ibb_uV = 1.4 + .1 * val

PMI8998_LAB_REG_BASE + REG_LABIBB_VOLTAGE = 0xde41

lab_uV = 4.6 + .1 * val

Konrad