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From:   Martin Kepplinger <martin.kepplinger@puri.sm>
To:     robh@kernel.org, mark.rutland@arm.com, shawnguo@kernel.org,
        s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com
Cc:     linux-imx@nxp.com, Anson.Huang@nxp.com, devicetree@vger.kernel.org,
        kernel@puri.sm, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org,
        Martin Kepplinger <martin.kepplinger@puri.sm>,
        Marco Felsch <m.felsch@pengutronix.de>
Subject: [PATCH v4 8/8] arm64: dts: librem5-devkit: add lsm9ds1 mount matrix
Date:   Thu, 27 Feb 2020 14:17:33 +0100
Message-Id: <20200227131733.4228-9-martin.kepplinger@puri.sm>
In-Reply-To: <20200227131733.4228-1-martin.kepplinger@puri.sm>
References: <20200227131733.4228-1-martin.kepplinger@puri.sm>
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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@puri.sm>
Reviewed-by: Marco Felsch <m.felsch@pengutronix.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