[PATCH v4 3/3] arm64: dts: qcom: glymur-lenovo-yoga-slim7x: add the embedded controller

[Oleg Keri <okerixx@gmail.com>]

Describe the Compal embedded controller on I2C at address 0x70. It
provides the board thermistors, the battery cell voltages and the CPU fan
speed, and drives the keyboard backlight. Its interrupt line is TLMM
gpio66, falling edge, for which the file already carries a pin state.

That state leaves the pin without a bias. gpio66 has no external pull
and floats when the EC is not driving it, which shows up as a steady
stream of spurious edges; the vendor ACPI tables describe the same pin
as GpioInt(Edge, ActiveLow, Exclusive, PullUp). Enable the pull-up.

Signed-off-by: Oleg Keri <okerixx@gmail.com>
---
 .../boot/dts/qcom/glymur-lenovo-yoga-slim7x.dts      | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/glymur-lenovo-yoga-slim7x.dts b/arch/arm64/boot/dts/qcom/glymur-lenovo-yoga-slim7x.dts
index 769f195c99d9..bc840fd8e458 100644
--- a/arch/arm64/boot/dts/qcom/glymur-lenovo-yoga-slim7x.dts
+++ b/arch/arm64/boot/dts/qcom/glymur-lenovo-yoga-slim7x.dts
@@ -659,7 +659,15 @@ &i2c9 {
 
 	status = "okay";
 
-	/* EC @ 0x70, irq = TLMM 66 */
+	embedded-controller@70 {
+		compatible = "lenovo,yoga-slim7x-gen11-ec";
+		reg = <0x70>;
+
+		interrupts-extended = <&tlmm 66 IRQ_TYPE_EDGE_FALLING>;
+
+		pinctrl-0 = <&ec_int_n_default>;
+		pinctrl-names = "default";
+	};
 };
 
 &lpass_vamacro {
@@ -990,7 +998,7 @@ reset-n-pins {
 	ec_int_n_default: ec-int-n-state {
 		pins = "gpio66";
 		function = "gpio";
-		bias-disable;
+		bias-pull-up;
 	};
 
 	kybd_default: kybd-default-state {
base-commit: 5c4d4169604b335c38bbc79bc1fc03042981fc6f
-- 
2.55.0