linux-kernel - [PATCH] ARM: dts: qcom: msm8974-samsung-hlte: Add touchkey support

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Message-Id: <20250419-hlte-touchkey-v1-1-9d93c3e2b31f@lucaweiss.eu>
Date: Sat, 19 Apr 2025 11:08:19 +0200
From: Luca Weiss <luca@...aweiss.eu>
To: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Adam Honse <calcprogrammer1@...il.com>, 
 Luca Weiss <luca@...aweiss.eu>
Subject: [PATCH] ARM: dts: qcom: msm8974-samsung-hlte: Add touchkey support

From: Adam Honse <calcprogrammer1@...il.com>

Add support for the touchkeys on the Samsung Galaxy Note 3 (hlte).

Signed-off-by: Adam Honse <calcprogrammer1@...il.com>
---
Signed-off-by: Luca Weiss <luca@...aweiss.eu>
---
 .../boot/dts/qcom/qcom-msm8974-samsung-hlte.dts    | 45 ++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/arch/arm/boot/dts/qcom/qcom-msm8974-samsung-hlte.dts b/arch/arm/boot/dts/qcom/qcom-msm8974-samsung-hlte.dts
index 903bb4d125135771504281df50aa11c9b6576a28..17d3e319941b8fd0363af600d93fc10127e4ab21 100644
--- a/arch/arm/boot/dts/qcom/qcom-msm8974-samsung-hlte.dts
+++ b/arch/arm/boot/dts/qcom/qcom-msm8974-samsung-hlte.dts
@@ -50,6 +50,34 @@ key-volume-up {
 		};
 	};
 
+	i2c-gpio-touchkey {
+		compatible = "i2c-gpio";
+
+		sda-gpios = <&tlmm 95 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+		scl-gpios = <&tlmm 96 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+
+		pinctrl-0 = <&i2c_touchkey_pins>;
+		pinctrl-names = "default";
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		touchkey@20 {
+			compatible = "cypress,midas-touchkey";
+			reg = <0x20>;
+
+			interrupts-extended = <&pm8941_gpios 29 IRQ_TYPE_EDGE_FALLING>;
+
+			pinctrl-0 = <&touchkey_pin>;
+			pinctrl-names = "default";
+
+			vcc-supply = <&pm8941_lvs3>;
+			vdd-supply = <&pm8941_l13>;
+
+			linux,keycodes = <KEY_APPSELECT KEY_BACK>;
+		};
+	};
+
 	touch_ldo: regulator-touch {
 		compatible = "regulator-fixed";
 		regulator-name = "touch-ldo";
@@ -149,6 +177,14 @@ touch_ldo_pin: touchscreen-ldo-state {
 		power-source = <PM8941_GPIO_S3>;
 		qcom,drive-strength = <PMIC_GPIO_STRENGTH_HIGH>;
 	};
+
+	touchkey_pin: touchkey-int-state {
+		pins = "gpio29";
+		function = "normal";
+		bias-disable;
+		input-enable;
+		power-source = <PM8941_GPIO_S3>;
+	};
 };
 
 &remoteproc_adsp {
@@ -332,6 +368,9 @@ pm8941_l24: l24 {
 			regulator-min-microvolt = <3075000>;
 			regulator-max-microvolt = <3075000>;
 		};
+
+		pm8941_lvs1: lvs1 {};
+		pm8941_lvs3: lvs3 {};
 	};
 };
 
@@ -378,6 +417,12 @@ sdhc3_pin_a: sdhc3-pin-active-state {
 		drive-strength = <8>;
 		bias-disable;
 	};
+
+	i2c_touchkey_pins: i2c-touchkey-state {
+		pins = "gpio95", "gpio96";
+		function = "gpio";
+		bias-pull-up;
+	};
 };
 
 &usb {

---
base-commit: 8ffd015db85fea3e15a77027fda6c02ced4d2444
change-id: 20250419-hlte-touchkey-8ea2f37a0795

Best regards,
-- 
Luca Weiss <luca@...aweiss.eu>