linux-kernel - [PATCH 2/2] arm64: dts: qcom: pmi8950: Fix VADC channel scaling factors

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Message-Id: <20251004-fix-pmi8950-vadc-v1-2-3143ecab99e9@smankusors.com>
Date: Sat,  4 Oct 2025 13:12:19 +0000 (UTC)
From: Antony Kurniawan Soemardi <linux@...nkusors.com>
To: 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>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Antony Kurniawan Soemardi <linux@...nkusors.com>
Subject: [PATCH 2/2] arm64: dts: qcom: pmi8950: Fix VADC channel scaling
 factors

Fix USBIN/DCIN scaling to match the downstream implementation [1].

Downstream defines the following scaling mappings [2], corresponding
to mainline pre-scaling values:

  <4>  ->  <1 20>
  <1>  ->  <1 3>

[1] https://github.com/LineageOS/android_kernel_qcom_msm8953/blob/e6b46fc6f52e754eef5ce6265c7d82a3622e0b0f/arch/arm64/boot/dts/qcom/pmi8950.dtsi#L55-L86
[2] https://github.com/LineageOS/android_kernel_qcom_msm8953/blob/e6b46fc6f52e754eef5ce6265c7d82a3622e0b0f/include/linux/qpnp/qpnp-adc.h#L342-L357

Signed-off-by: Antony Kurniawan Soemardi <linux@...nkusors.com>
---
 arch/arm64/boot/dts/qcom/pmi8950.dtsi | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/pmi8950.dtsi b/arch/arm64/boot/dts/qcom/pmi8950.dtsi
index 16e436b68a7c161b1afd4f3eac3d7d8564e40512..5bd91a5cd1245f34ef37d98b1a2669582e84876c 100644
--- a/arch/arm64/boot/dts/qcom/pmi8950.dtsi
+++ b/arch/arm64/boot/dts/qcom/pmi8950.dtsi
@@ -22,19 +22,19 @@ pmi8950_vadc: adc@...0 {
 
 			channel@0 {
 				reg = <VADC_USBIN>;
-				qcom,pre-scaling = <1 4>;
+				qcom,pre-scaling = <1 20>;
 				label = "usbin";
 			};
 
 			channel@1 {
 				reg = <VADC_DCIN>;
-				qcom,pre-scaling = <1 4>;
+				qcom,pre-scaling = <1 20>;
 				label = "dcin";
 			};
 
 			channel@2 {
 				reg = <VADC_VCHG_SNS>;
-				qcom,pre-scaling = <1 1>;
+				qcom,pre-scaling = <1 3>;
 				label = "vchg_sns";
 			};
 

-- 
2.34.1