linux-kernel - [PATCH v1 12/12] arm64: dts: librem5-devkit: add lsm9ds1 mount matrix

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Date:   Wed,  5 Feb 2020 15:30:03 +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 v1 12/12] 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>
---

this is what I've previously sent as a single patch already:
https://lore.kernel.org/linux-arm-kernel/20200120100722.30359-1-martin.kepplinger@puri.sm/

 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 15cc05c0d6cf..e2db3866bdee 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
@@ -550,6 +550,9 @@
 		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