linux-kernel - [PATCH v4 8/8] arm64: dts: librem5-devkit: add lsm9ds1 mount matrix

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200227131733.4228-9-martin.kepplinger@puri.sm>
Date:   Thu, 27 Feb 2020 14:17:33 +0100
From:   Martin Kepplinger <martin.kepplinger@...i.sm>
To:     robh@...nel.org, mark.rutland@....com, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com
Cc:     linux-imx@....com, Anson.Huang@....com, devicetree@...r.kernel.org,
        kernel@...i.sm, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Martin Kepplinger <martin.kepplinger@...i.sm>,
        Marco Felsch <m.felsch@...gutronix.de>
Subject: [PATCH v4 8/8] arm64: dts: librem5-devkit: add lsm9ds1 mount matrix

The IMU chip on the librem5-devkit is not mounted at the "natural" place
that would match normal phone orientation (see the documentation for the
details about what that is).

Since the lsm9ds1 driver supports providing a mount matrix, we can describe
the orientation on the board in the dts:

Create a right-handed coordinate system (x * -1; see the datasheet for the
axis) and rotate 180 degrees around the y axis because the device sits on
the back side from the display.

Signed-off-by: Martin Kepplinger <martin.kepplinger@...i.sm>
Reviewed-by: Marco Felsch <m.felsch@...gutronix.de>
---
 arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts b/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
index 72c622ffe6de..10eca94194be 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
@@ -539,6 +539,9 @@
 		reg = <0x6a>;
 		vdd-supply = <&reg_3v3_p>;
 		vddio-supply = <&reg_3v3_p>;
+		mount-matrix =  "1",  "0",  "0",
+				"0",  "1",  "0",
+				"0",  "0", "-1";
 	};
 };
 
-- 
2.20.1