linux-kernel - [PATCH 2/7] ARM: dts: qcom: msm8974-klte: Add support for touchkey

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Message-Id: <20200630140912.260294-3-iskren.chernev@gmail.com>
Date:   Tue, 30 Jun 2020 17:09:07 +0300
From:   Iskren Chernev <iskren.chernev@...il.com>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht,
        linux-arm-msm@...r.kernel.org,
        Iskren Chernev <iskren.chernev@...il.com>
Subject: [PATCH 2/7] ARM: dts: qcom: msm8974-klte: Add support for touchkey

Add support for the touchkey found on the Samsung Galaxy S5. The
touchkey is responsible for handling the application and back buttons
found around the home button.

Signed-off-by: Iskren Chernev <iskren.chernev@...il.com>
---
 .../boot/dts/qcom-msm8974-samsung-klte.dts    | 44 ++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/qcom-msm8974-samsung-klte.dts b/arch/arm/boot/dts/qcom-msm8974-samsung-klte.dts
index 9520c6e7910ce..750e2f261139a 100644
--- a/arch/arm/boot/dts/qcom-msm8974-samsung-klte.dts
+++ b/arch/arm/boot/dts/qcom-msm8974-samsung-klte.dts
@@ -145,7 +145,7 @@ pma8084_l18: l18 {
 					};
 
 					pma8084_l19: l19 {
-						regulator-min-microvolt = <2900000>;
+						regulator-min-microvolt = <3300000>;
 						regulator-max-microvolt = <3300000>;
 					};
 
@@ -203,6 +203,31 @@ pma8084_l27: l27 {
 		};
 	};
 
+	i2c-gpio-touchkey {
+		compatible = "i2c-gpio";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		sda-gpios = <&msmgpio 95 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+		scl-gpios = <&msmgpio 96 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&i2c_touchkey_pins>;
+
+		touchkey@20 {
+			compatible = "cypress,tm2-touchkey";
+			reg = <0x20>;
+
+			interrupt-parent = <&pma8084_gpios>;
+			interrupts = <6 IRQ_TYPE_EDGE_FALLING>;
+			pinctrl-names = "default";
+			pinctrl-0 = <&touchkey_pin>;
+
+			vcc-supply = <&max77826_ldo15>;
+			vdd-supply = <&pma8084_l19>;
+
+			linux,keycodes = <KEY_APPSELECT KEY_BACK>;
+		};
+	};
+
 	/delete-node/ vreg-boost;
 };
 
@@ -268,6 +293,15 @@ mux {
 				bias-disable;
 			};
 		};
+
+		i2c_touchkey_pins: i2c-touchkey {
+			mux {
+				pins = "gpio95", "gpio96";
+				function = "gpio";
+				input-enable;
+				bias-pull-up;
+			};
+		};
 	};
 
 	sdhci@...24900 {
@@ -418,6 +452,14 @@ gpio_keys_pin_a: gpio-keys-active {
 				bias-pull-up;
 				power-source = <PMA8084_GPIO_S4>;
 			};
+
+			touchkey_pin: touchkey-int-pin {
+				pins = "gpio6";
+				function = "normal";
+				bias-disable;
+				input-enable;
+				power-source = <PMA8084_GPIO_S4>;
+			};
 		};
 	};
 };
-- 
2.27.0