linux-kernel - Re: [PATCH] arm64: dts: librem5-devkit: add lsm9ds1 mount matrix

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Date:   Mon, 3 Feb 2020 12:05:45 +0100
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Martin Kepplinger <martin.kepplinger@...i.sm>
Cc:     robh@...nel.org, mark.rutland@....com, shawnguo@...nel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kernel@...gutronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: librem5-devkit: add lsm9ds1 mount matrix

Hi Martin,

On 20-01-20 11:07, Martin Kepplinger wrote:
> 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:

I didn't found the patch which adds the iio_read_mount_matrix()
support. Appart of that your patch looks good so feel free to add my:

Reviewed-by: Marco Felsch <m.felsch@...gutronix.de> 

Regards,
  Marco

> 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>
> ---
> 
> tested on the librem5-devkit of course, finally fixing the orientation problem
> for the accelerometer :)
> 
> thanks,
> 
>                             martin
> 
> 
>  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 703254282b96..6c8ab009081b 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
> @@ -457,6 +457,9 @@
>  		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