linux-kernel - [PATCH v4 1/4] arm64: dts: rk3399-pinephone-pro: Add light/proximity sensor support

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Message-Id: <20250929-ppp_light_accel_mag_vol-down-v4-1-6598f22d3451@gmail.com>
Date: Mon, 29 Sep 2025 00:35:12 -0700
From: Rudraksha Gupta via B4 Relay <devnull+guptarud.gmail.com@...nel.org>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Rudraksha Gupta <guptarud@...il.com>, Ondrej Jirman <megi@....cz>, 
 Martijn Braam <martijn@...xit.nl>, 
 Kamil Trzciński <ayufan@...fan.eu>
Subject: [PATCH v4 1/4] arm64: dts: rk3399-pinephone-pro: Add
 light/proximity sensor support

From: Ondrej Jirman <megi@....cz>

Pinephone Pro uses STK3311 according to the schematics.

Tests:
~ $ hwtest # output tweaked to fit in 80 chars
Category  proximity
Model     stk3310
Path      /sys/bus/iio/devices/iio:device0
Status    working
Value     59.3 (when covered) and 2.2 (when uncovered)

Category  illuminance
Model     stk3310
Path      /sys/bus/iio/devices/iio:device0
Status    working
Value     1 (when covered) and 101 (when uncovered)

~ $ monitor-sensor
    // When the sensor is exposed, it get's fluctating values such as
    Light changed: 1.800000 (lux)
    Light changed: 1.700000 (lux)
    Light changed: 1.800000 (lux)
    Light changed: 1.700000 (lux)
    Light changed: 1.600000 (lux)
    Light changed: 1.100000 (lux)
    // When covering the sensor, it prints a low value and stops printing
    Light changed: 0.200000 (lux)

Co-developed-by: Martijn Braam <martijn@...xit.nl>
Signed-off-by: Martijn Braam <martijn@...xit.nl>
Co-developed-by: Kamil Trzciński <ayufan@...fan.eu>
Signed-off-by: Kamil Trzciński <ayufan@...fan.eu>
Signed-off-by: Ondrej Jirman <megi@....cz>
Signed-off-by: Rudraksha Gupta <guptarud@...il.com>
---
 arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts b/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
index 6f97e57f36f5599f4027a0f3db98bcbc69cef5e5..71d32c4bae0d0336ac0c912043618fc9b94919ef 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
@@ -520,6 +520,15 @@ touchscreen@14 {
 		touchscreen-size-x = <720>;
 		touchscreen-size-y = <1440>;
 	};
+
+	light-sensor@48 {
+		compatible = "sensortek,stk3311";
+		reg = <0x48>;
+		interrupt-parent = <&gpio4>;
+		interrupts = <RK_PD3 IRQ_TYPE_EDGE_FALLING>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&stk3311_int>;
+	};
 };
 
 &i2c4 {
@@ -689,6 +698,12 @@ vcc1v8_codec_en: vcc1v8-codec-en {
 		};
 	};
 
+	stk3311 {
+		stk3311_int: stk3311-int {
+			rockchip,pins = <4 RK_PD3 RK_FUNC_GPIO &pcfg_input_pull_up>;
+		};
+	};
+
 	wireless-bluetooth {
 		bt_wake_pin: bt-wake-pin {
 			rockchip,pins = <2 RK_PD2 RK_FUNC_GPIO &pcfg_pull_none>;

-- 
2.51.0