linux-kernel - [PATCH v3 3/3] arm64: dts: qcom: x1e80100-t14s: add EC

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Message-Id: <20250906-thinkpad-t14s-ec-v3-3-3ce6ec21ae89@collabora.com>
Date: Sat, 06 Sep 2025 03:12:05 +0200
From: Sebastian Reichel <sre@...nel.org>
To: Sebastian Reichel <sre@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Hans de Goede <hansg@...nel.org>, 
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Mark Pearson <mpearson-lenovo@...ebb.ca>
Cc: "Derek J. Clark" <derekjohn.clark@...il.com>, 
 Henrique de Moraes Holschuh <hmh@....eng.br>, 
 Neil Armstrong <neil.armstrong@...aro.org>, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, 
 Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: [PATCH v3 3/3] arm64: dts: qcom: x1e80100-t14s: add EC

Describe ThinkPad Embedded Controller in the T14s device tree,
which adds LED and special key support.

Tested-by: Neil Armstrong <neil.armstrong@...aro.org> # on Thinkpad T14S OLED
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Signed-off-by: Sebastian Reichel <sre@...nel.org>
---
 .../dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi    | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi b/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi
index ac1dddf27da30e6a9f7e1d1ecbd5192bf2d0671e..f70489aba870289edbcf84ec22fdb004e010868b 100644
--- a/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi
+++ b/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi
@@ -887,6 +887,24 @@ eusb6_repeater: redriver@4f {
 	};
 };

+&i2c6 {
+	clock-frequency = <400000>;
+
+	status = "okay";
+
+	embedded-controller@28 {
+		compatible = "lenovo,thinkpad-t14s-ec";
+		reg = <0x28>;
+
+		interrupts-extended = <&tlmm 66 IRQ_TYPE_LEVEL_LOW>;
+
+		pinctrl-0 = <&ec_int_n_default>;
+		pinctrl-names = "default";
+
+		wakeup-source;
+	};
+};
+
 &i2c7 {
 	clock-frequency = <400000>;

@@ -1267,6 +1285,12 @@ &tlmm {
 			       <72 2>, /* Secure EC I2C connection (?) */
 			       <238 1>; /* UFS Reset */

+	ec_int_n_default: ec-int-n-state {
+		pins = "gpio66";
+		function = "gpio";
+		bias-disable;
+	};
+
 	eusb3_reset_n: eusb3-reset-n-state {
 		pins = "gpio6";
 		function = "gpio";

-- 
2.50.1