linux-kernel - [PATCH v2 5/5] arm64: dts: qcom: x1e78100-t14s: Enable audio headset support

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Message-Id: <20250320115633.4248-6-srinivas.kandagatla@linaro.org>
Date: Thu, 20 Mar 2025 11:56:33 +0000
From: srinivas.kandagatla@...aro.org
To: peda@...ntia.se,
	broonie@...nel.org,
	andersson@...nel.org,
	krzk+dt@...nel.org
Cc: ivprusov@...utedevices.com,
	luca.ceresoli@...tlin.com,
	zhoubinbin@...ngson.cn,
	paulha@...nsource.cirrus.com,
	lgirdwood@...il.com,
	robh@...nel.org,
	conor+dt@...nel.org,
	konradybcio@...nel.org,
	perex@...ex.cz,
	tiwai@...e.com,
	dmitry.baryshkov@....qualcomm.com,
	linux-sound@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	johan+linaro@...nel.org,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH v2 5/5] arm64: dts: qcom: x1e78100-t14s: Enable audio headset support

From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>

On Lenovo ThinkPad T14s, the headset is connected via a HiFi mux to
support CTIA and OMTP headsets. This switch is used to minimise pop and
click during headset type switching.

Enable the mux controls required to power this switch along with wiring up
gpio that control the headset switching.

Without this, headset audio will be very noisy and might see headset
detection errors.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 .../qcom/x1e78100-lenovo-thinkpad-t14s.dts    | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dts b/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dts
index b2c2347f54fa..b40775c20493 100644
--- a/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dts
+++ b/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dts
@@ -19,6 +19,16 @@ / {
 	compatible = "lenovo,thinkpad-t14s", "qcom,x1e78100", "qcom,x1e80100";
 	chassis-type = "laptop";
 
+	/* two muxes together support CTIA and OMTP switching */
+	us_euro_mux_ctrl: mux-controller {
+		compatible = "gpio-mux";
+		pinctrl-0 = <&us_euro_hs_sel>;
+		pinctrl-names = "default";
+		mux-supply = <&vreg_l16b_2p5>;
+		#mux-control-cells = <0>;
+		mux-gpios = <&tlmm 68 GPIO_ACTIVE_HIGH>;
+	};
+
 	wcd938x: audio-codec {
 		compatible = "qcom,wcd9385-codec";
 
@@ -36,6 +46,7 @@ wcd938x: audio-codec {
 		qcom,tx-device = <&wcd_tx>;
 
 		reset-gpios = <&tlmm 191 GPIO_ACTIVE_LOW>;
+		mux-controls = <&us_euro_mux_ctrl>;
 
 		vdd-buck-supply = <&vreg_l15b_1p8>;
 		vdd-rxtx-supply = <&vreg_l15b_1p8>;
@@ -367,6 +378,13 @@ vreg_l15b_1p8: ldo15 {
 			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
 		};
 
+		vreg_l16b_2p5: ldo16 {
+			regulator-name = "vreg_l16b_2p5";
+			regulator-min-microvolt = <2504000>;
+			regulator-max-microvolt = <2504000>;
+			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
+		};
+
 		vreg_l17b_2p5: ldo17 {
 			regulator-name = "vreg_l17b_2p5";
 			regulator-min-microvolt = <2504000>;
@@ -942,6 +960,13 @@ int-n-pins {
 		};
 	};
 
+	us_euro_hs_sel: us-euro-hs-sel-state {
+		pins = "gpio68";
+		function = "gpio";
+		bias-pull-down;
+		drive-strength = <2>;
+	};
+
 	kybd_default: kybd-default-state {
 		pins = "gpio67";
 		function = "gpio";
-- 
2.39.5