[PATCH 3/3] arm64: dts: qcom: mahua-lenovo-thinkpad-t14s-gen7: Describe the Embedded Controller

[Abel Vesa]

The ThinkPad T14s Gen 7 has its embedded controller at 0x28 on QUP
i2c9 (ACPI \_SB.IC10). It uses a different command protocol than the
Gen 6 one, so describe it with the Gen 7 compatible. Its interrupt is
GPIO 66, as on the Gen 6, but the firmware describes it as edge
triggered, active low. Using a level trigger makes the handler fire
continuously while the EC holds the line low, with no event pending.

This provides the EC hotkeys, LEDs and keyboard backlight.

Signed-off-by: Abel Vesa <abel.vesa@xxxxxxxxxxxxxxxx>
---
 .../qcom/mahua-lenovo-thinkpad-t14s-gen7-lcd.dts   | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/mahua-lenovo-thinkpad-t14s-gen7-lcd.dts b/arch/arm64/boot/dts/qcom/mahua-lenovo-thinkpad-t14s-gen7-lcd.dts
index 26d6d8285e04..05814dc8d905 100644
--- a/arch/arm64/boot/dts/qcom/mahua-lenovo-thinkpad-t14s-gen7-lcd.dts
+++ b/arch/arm64/boot/dts/qcom/mahua-lenovo-thinkpad-t14s-gen7-lcd.dts
@@ -735,6 +735,24 @@ ptn3222_fpr: redriver@4f {
 	};
 };
 
+&i2c9 {
+	clock-frequency = <400000>;
+
+	status = "okay";
+
+	embedded-controller@28 {
+		compatible = "lenovo,thinkpad-t14s-gen7-ec";
+		reg = <0x28>;
+
+		interrupts-extended = <&tlmm 66 IRQ_TYPE_EDGE_FALLING>;
+
+		pinctrl-0 = <&ec_int_n_default>;
+		pinctrl-names = "default";
+
+		wakeup-source;
+	};
+};
+
 &lpass_vamacro {
 	pinctrl-0 = <&dmic01_default>;
 	pinctrl-names = "default";
@@ -987,6 +1005,12 @@ &tlmm {
 			       <44 4>,  /* TPM */
 			       <139 1>; /* TZ trigger */
 
+	ec_int_n_default: ec-int-n-state {
+		pins = "gpio66";
+		function = "gpio";
+		bias-disable;
+	};
+
 	edp_bl_en: edp-bl-en-state {
 		pins = "gpio18";
 		function = "gpio";

-- 
2.54.0