From: Ondrej Jirman <megi@xff.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@brixit.nl>
Signed-off-by: Martijn Braam <martijn@brixit.nl>
Co-developed-by: Kamil Trzciński <ayufan@ayufan.eu>
Signed-off-by: Kamil Trzciński <ayufan@ayufan.eu>
Signed-off-by: Ondrej Jirman <megi@xff.cz>
Signed-off-by: Rudraksha Gupta <guptarud@gmail.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

Hi,

On Mon Sep 29, 2025 at 9:35 AM CEST, Rudraksha Gupta via B4 Relay wrote:
> From: Ondrej Jirman <megi@xff.cz>
>
> Pinephone Pro uses STK3311 according to the schematics.
> ...
> Co-developed-by: Martijn Braam <martijn@brixit.nl>
> Signed-off-by: Martijn Braam <martijn@brixit.nl>
> Co-developed-by: Kamil Trzciński <ayufan@ayufan.eu>
> Signed-off-by: Kamil Trzciński <ayufan@ayufan.eu>
> Signed-off-by: Ondrej Jirman <megi@xff.cz>
> Signed-off-by: Rudraksha Gupta <guptarud@gmail.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>;

On page 11 and 17 of PPP schematic V1.0-20211127 I see LIGHT_INT_L as
identifier so it's best to use that identifier here, thus
``light_int_l: light-int-l {``
and update the pinctrl-0 reference accordingly.

Cheers,
  Diederik

> +		};
> +	};
> +
>  	wireless-bluetooth {
>  		bt_wake_pin: bt-wake-pin {
>  			rockchip,pins = <2 RK_PD2 RK_FUNC_GPIO &pcfg_pull_none>;