[v4] arm64: dts: qcom: sdm845-lg-{common, judyln}: Improve HW support in dts

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

Posted by Paul Sajna 6 days, 15 hours ago

These regulators are required for the LCD

Signed-off-by: Paul Sajna <sajattack@postmarketos.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>;
+	regulator-over-current-protection;
+	regulator-pull-down;
+	regulator-soft-start;
+	qcom,discharge-resistor-kohms = <300>;
+};
+
 &ipa {
 	firmware-name = "qcom/sdm845/lg/judyln/ipa_fws.mbn";
 };
 
+&lab {
+	regulator-min-microvolt = <4600000>;
+	regulator-max-microvolt = <6000000>;
+	regulator-over-current-protection;
+	regulator-pull-down;
+	regulator-soft-start;
+};
+
 &mdss {
 	status = "okay";
 };

-- 
2.52.0

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

Posted by Konrad Dybcio 11 hours ago

On 11/25/25 9:12 AM, Paul Sajna wrote:
> These regulators are required for the LCD
> 
> Signed-off-by: Paul Sajna <sajattack@postmarketos.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