linux-kernel - [PATCH v6 1/2] arm64: dts: rockchip: Add magnetometer sensor to Pinephone Pro

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Message-Id: <20251225-ppp_light_accel_mag_vol-down-v6-1-8c79a4e87001@gmail.com>
Date: Thu, 25 Dec 2025 19:43:19 -0800
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, 
 phone-devel@...r.kernel.org, Rudraksha Gupta <guptarud@...il.com>, 
 Ondrej Jirman <megi@....cz>, "Leonardo G. Trombetta" <lgtrombetta@....com>, 
 Pavel Machek <pavel@....cz>
Subject: [PATCH v6 1/2] arm64: dts: rockchip: Add magnetometer sensor to
 Pinephone Pro

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

Pinephone Pro uses AF8133J according to the schematic.

The mount-matrix was added by Leonardo on top of Ondrej's work of adding
the magnetometer. It was verified with Leonardo's compass app:

https://gitlab.com/lgtrombetta/compass

Co-developed-by: Leonardo G. Trombetta <lgtrombetta@....com>
Signed-off-by: Leonardo G. Trombetta <lgtrombetta@....com>
Signed-off-by: Ondrej Jirman <megi@....cz>
Reviewed-by: Pavel Machek <pavel@....cz>
Signed-off-by: Rudraksha Gupta <guptarud@...il.com>
---
 .../boot/dts/rockchip/rk3399-pinephone-pro.dts     | 23 ++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts b/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
index 2dca1dca20b8..1d3baa557c70 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
@@ -537,6 +537,23 @@ mpu6500@68 {
 	};
 };

+&i2c4 {
+	af8133j: compass@1c {
+		compatible = "voltafield,af8133j";
+		reg = <0x1c>;
+		avdd-supply = <&vcc_3v0>;
+		dvdd-supply = <&vcc_1v8>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&compass_rst_l>;
+		reset-gpios = <&gpio1 RK_PA1 GPIO_ACTIVE_LOW>;
+
+		mount-matrix =
+			"0", "1", "0",
+			"-1", "0", "0",
+			"0", "0", "1";
+	};
+};
+
 &io_domains {
 	bt656-supply = <&vcc1v8_dvp>;
 	audio-supply = <&vcca1v8_codec>;
@@ -649,6 +666,12 @@ dvp_pdn0_h: dvp-pdn0-h {
 		};
 	};

+	compass {
+		compass_rst_l: compass-rst-l {
+			rockchip,pins = <1 RK_PA1 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+
 	leds {
 		red_led_pin: red-led-pin {
 			rockchip,pins = <4 RK_PD2 RK_FUNC_GPIO &pcfg_pull_none>;

-- 
2.52.0