linux-kernel - Re: [v2 03/10] iio: document euler angles modifiers

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Date:   Thu, 28 Oct 2021 11:41:54 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Andrea Merello <andrea.merello@...il.com>
Cc:     mchehab+huawei@...nel.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        lars@...afoo.de, robh+dt@...nel.org, andy.shevchenko@...il.com,
        matt.ranostay@...sulko.com, ardeleanalex@...il.com,
        jacopo@...ndi.org, Andrea Merello <andrea.merello@....it>
Subject: Re: [v2 03/10] iio: document euler angles modifiers

On Thu, 28 Oct 2021 12:18:33 +0200
Andrea Merello <andrea.merello@...il.com> wrote:

> This patch introduces ABI documentation for new modifiers used for
> reporting rotations expressed as euler angles (i.e. yaw, pitch, roll).
> 
> Signed-off-by: Andrea Merello <andrea.merello@....it>
> ---
>  Documentation/ABI/testing/sysfs-bus-iio | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
> index 5147a00bf24a..f0adc2c817bd 100644
> --- a/Documentation/ABI/testing/sysfs-bus-iio
> +++ b/Documentation/ABI/testing/sysfs-bus-iio
> @@ -1965,3 +1965,11 @@ KernelVersion:	5.15
>  Contact:	linux-iio@...r.kernel.org
>  Description:
>  		Raw (unscaled) linear acceleration readings.
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/in_rot_yaw_raw
> +What:		/sys/bus/iio/devices/iio:deviceX/in_rot_pitch_raw
> +What:		/sys/bus/iio/devices/iio:deviceX/in_rot_roll_raw
> +KernelVersion:	5.15
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Raw (unscaled) euler angles readings.
Any _raw entry should also include what the units are after application of
offset and scale.   Or you could just add this as more info to the in_rot_raw
block as an extra sentence explaining that they are euler angles.
That will lose the 'KernelVersion' information but honestly I'm not sure we
care that much about that.

Jonathan