linux-kernel - [PATCH 02/11] arm64: dts: qcom: sdm845-oneplus-*: set constant-charge-current-max-microamp

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Message-Id: <20250619-smb2-smb5-support-v1-2-ac5dec51b6e1@linaro.org>
Date: Thu, 19 Jun 2025 16:55:10 +0200
From: Casey Connolly <casey.connolly@...aro.org>
To: Sebastian Reichel <sre@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, Kees Cook <kees@...nel.org>, 
 "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Sebastian Reichel <sebastian.reichel@...labora.com>, 
 linux-hardening@...r.kernel.org, Casey Connolly <casey.connolly@...aro.org>
Subject: [PATCH 02/11] arm64: dts: qcom: sdm845-oneplus-*: set
 constant-charge-current-max-microamp

Set the maximum constant charge current to use for this battery. While
the battery is likely comfortably capable of 4A or so, OnePlus didn't
include a secondary charger IC for parallel charging (instead they have
their proprietary Dash Charging). It's possible that this value could be
safely increased after some testing (and when we have support for
modelling the charger as a cooling device properly), but for now this
value is acceptable.

This is references from qcom,usb-icl-ua property in the downstream
vendor devicetree.

Signed-off-by: Casey Connolly <casey.connolly@...aro.org>
---
 arch/arm64/boot/dts/qcom/sdm845-oneplus-enchilada.dts | 8 ++++++++
 arch/arm64/boot/dts/qcom/sdm845-oneplus-fajita.dts    | 8 ++++++++
 2 files changed, 16 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sdm845-oneplus-enchilada.dts b/arch/arm64/boot/dts/qcom/sdm845-oneplus-enchilada.dts
index 4005e04d998a40d25a64d652a526bf93efc20332..9ab5ddc1f6cbbdcfbf793b959d199b20256be9ed 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-oneplus-enchilada.dts
+++ b/arch/arm64/boot/dts/qcom/sdm845-oneplus-enchilada.dts
@@ -19,8 +19,16 @@ battery: battery {

 		charge-full-design-microamp-hours = <3300000>;
 		voltage-min-design-microvolt = <3400000>;
 		voltage-max-design-microvolt = <4400000>;
+
+		/*
+		 * Typical designs have multiple charger ICs which can handle more
+		 * current but the OnePlus 6/T do not, hence the lower limit. This
+		 * does not apply when using the Dash Charger, however this is not
+		 * yet supported.
+		 */
+		constant-charge-current-max-microamp = <1800000>;
 	};
 };

 &display_panel {
diff --git a/arch/arm64/boot/dts/qcom/sdm845-oneplus-fajita.dts b/arch/arm64/boot/dts/qcom/sdm845-oneplus-fajita.dts
index 9471ada0d6ad8bd44cc58a6efa07f7eb27921af9..1644648fb8800934e4a8a9b54380bb019dcd0059 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-oneplus-fajita.dts
+++ b/arch/arm64/boot/dts/qcom/sdm845-oneplus-fajita.dts
@@ -19,8 +19,16 @@ battery: battery {

 		charge-full-design-microamp-hours = <3700000>;
 		voltage-min-design-microvolt = <3400000>;
 		voltage-max-design-microvolt = <4400000>;
+
+		/*
+		 * Typical designs have multiple charger ICs which can handle more
+		 * current but the OnePlus 6/T do not, hence the lower limit. This
+		 * does not apply when using the Dash Charger, however this is not
+		 * yet supported.
+		 */
+		constant-charge-current-max-microamp = <1800000>;
 	};
 };

 &display_panel {

-- 
2.49.0