[PATCH 03/15] arm64: dts: qcom: msm8916-samsung-serranove: Add touch key

[Stephan Gerhold]

Add the CORERIVER TC360 touch key together with the two necessary
fixed regulators for it.

Note that for some reason Samsung decided to connect this to GPIOs
where no hardware I2C bus is available, so we need to fall back
to software bit-banging using i2c-gpio.

Signed-off-by: Stephan Gerhold <stephan at gerhold.net>
---
 .../dts/qcom/msm8916-samsung-serranove.dts    | 87 +++++++++++++++++++
 1 file changed, 87 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/msm8916-samsung-serranove.dts b/arch/arm64/boot/dts/qcom/msm8916-samsung-serranove.dts
index 214a863eedbf..6689687f544f 100644
--- a/arch/arm64/boot/dts/qcom/msm8916-samsung-serranove.dts
+++ b/arch/arm64/boot/dts/qcom/msm8916-samsung-serranove.dts
@@ -91,6 +91,32 @@ reg_vdd_tsp: regulator-vdd-tsp {
 		pinctrl-0 = <&tsp_en_default>;
 	};
 
+	reg_touch_key: regulator-touch-key {
+		compatible = "regulator-fixed";
+		regulator-name = "touch_key";
+		regulator-min-microvolt = <2800000>;
+		regulator-max-microvolt = <2800000>;
+
+		gpio = <&msmgpio 86 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&tkey_en_default>;
+	};
+
+	reg_key_led: regulator-key-led {
+		compatible = "regulator-fixed";
+		regulator-name = "key_led";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+
+		gpio = <&msmgpio 60 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&tkey_led_en_default>;
+	};
+
 	i2c-muic {
 		compatible = "i2c-gpio";
 		sda-gpios = <&msmgpio 105 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
@@ -113,6 +139,35 @@ muic: extcon at 14 {
 			pinctrl-0 = <&muic_irq_default>;
 		};
 	};
+
+	i2c-tkey {
+		compatible = "i2c-gpio";
+		sda-gpios = <&msmgpio 16 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
+		scl-gpios = <&msmgpio 17 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&tkey_i2c_default>;
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		touchkey at 20 {
+			compatible = "coreriver,tc360-touchkey";
+			reg = <0x20>;
+
+			interrupt-parent = <&msmgpio>;
+			interrupts = <98 IRQ_TYPE_EDGE_FALLING>;
+
+			vcc-supply = <&reg_touch_key>;
+			vdd-supply = <&reg_key_led>;
+			vddio-supply = <&pm8916_l6>;
+
+			linux,keycodes = <KEY_APPSELECT KEY_BACK>;
+
+			pinctrl-names = "default";
+			pinctrl-0 = <&tkey_default>;
+		};
+	};
 };
 
 &blsp_i2c5 {
@@ -333,6 +388,38 @@ muic_irq_default: muic-irq-default {
 		bias-disable;
 	};
 
+	tkey_default: tkey-default {
+		pins = "gpio98";
+		function = "gpio";
+
+		drive-strength = <2>;
+		bias-disable;
+	};
+
+	tkey_en_default: tkey-en-default {
+		pins = "gpio86";
+		function = "gpio";
+
+		drive-strength = <2>;
+		bias-disable;
+	};
+
+	tkey_i2c_default: tkey-i2c-default {
+		pins = "gpio16", "gpio17";
+		function = "gpio";
+
+		drive-strength = <2>;
+		bias-disable;
+	};
+
+	tkey_led_en_default: tkey-led-en-default {
+		pins = "gpio60";
+		function = "gpio";
+
+		drive-strength = <2>;
+		bias-disable;
+	};
+
 	tsp_en_default: tsp-en-default {
 		pins = "gpio73";
 		function = "gpio";
-- 
2.33.0