[PATCH v5 3/3] arm64: dts: qcom: glymur-lenovo-yoga-slim7x: add the embedded controller

[Oleg Keri]

Describe the Compal embedded controller on I2C at address 0x70. It
provides the board thermistors 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@xxxxxxxxx>
Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>
Reviewed-by: Abel Vesa <abel.vesa@xxxxxxxxxxxxxxxx>
---
 .../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 {
-- 
2.55.0