linux-kernel - [PATCH v2 4/5] arm64: dts: rk3399-pinephone-pro: Add mount-matrix for magnetometer

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Message-Id: <20250921-ppp_light_accel_mag_vol-down-v2-4-e6bcc6ca74ae@gmail.com>
Date: Sun, 21 Sep 2025 01:04:22 -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>, 
 "Leonardo G. Trombetta" <lgtrombetta@....com>
Subject: [PATCH v2 4/5] arm64: dts: rk3399-pinephone-pro: Add mount-matrix
 for magnetometer

From: "Leonardo G. Trombetta" <lgtrombetta@....com>

After experimenting with the magnetometer on the Pinephone Pro I found
out the mount-matrix currently reported by the AF8133J driver is just
the identity matrix (no rotation), which is wrong. It would seem to me
that there is currently no `mount-matrix` info and that's why the driver
reports a trivial answer. As far as I can tell from my tests, a 90
degree clockwise rotation in the XY plane would align it properly.

Signed-off-by: Leonardo G. Trombetta <lgtrombetta@....com>
Signed-off-by: Rudraksha Gupta <guptarud@...il.com>
---
 arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts b/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
index 266a08540dd0fe099319ec703bb0828c8c5c2c25..0a4121b05d36c5a7e05eddbd3514a11ae4f7d3eb 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
@@ -561,6 +561,11 @@ af8133j: compass@1c {
 		reset-gpios = <&gpio1 RK_PA1 GPIO_ACTIVE_LOW>;
 		avdd-supply = <&vcc_3v0>;
 		dvdd-supply = <&vcc_1v8>;
+
+		mount-matrix =
+			"0", "1", "0",
+			"-1", "0", "0",
+			"0", "0", "1";
 	};
 };

-- 
2.51.0