linux-kernel - Re: [v2 02/10] iio: document linear acceleration modifiers

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Date:   Thu, 28 Oct 2021 11:40:08 +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 02/10] iio: document linear acceleration modifiers

On Thu, 28 Oct 2021 12:18:32 +0200
Andrea Merello <andrea.merello@...il.com> wrote:

> This patch introduces ABI documentation for new iio modifiers used for
> reporting "linear acceleration" measures.
> 
> 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 6ad47a67521c..5147a00bf24a 100644
> --- a/Documentation/ABI/testing/sysfs-bus-iio
> +++ b/Documentation/ABI/testing/sysfs-bus-iio
> @@ -1957,3 +1957,11 @@ Description:
>  		Specify the percent for light sensor relative to the channel
>  		absolute value that a data field should change before an event
>  		is generated. Units are a percentage of the prior reading.
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/in_accel_linear_x_raw
> +What:		/sys/bus/iio/devices/iio:deviceX/in_accel_linear_y_raw
> +What:		/sys/bus/iio/devices/iio:deviceX/in_accel_linear_z_raw
> +KernelVersion:	5.15
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Raw (unscaled) linear acceleration readings.

Probably need more information that this.   What element is being 'removed' from
a normal acceleration measurement? What are units after application of offset and
scale?  Can cross refer to the in_accel_x_raw for that info if you like.

Also, but them immediately after the block with the in_accel_x_raw etc

The organization fo that file needs a rethink but let us try to avoid making
it worse in the meeantime!

Jonathan