[PATCH v5 3/3] arm64: dts: qcom: x1e80100-t14s: add EC

Sebastian Reichel
2025-09-18T21:20:57Z

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

Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on Thinkpad T14S OLED
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Sebastian Reichel <sre@kernel.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";

--
2.51.0