linux-kernel - Re: [v3 09/13] iio: document "serial

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Date:   Sat, 19 Feb 2022 16:52:14 +0000
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: [v3 09/13] iio: document "serial_number" sysfs attribute

On Thu, 17 Feb 2022 17:27:06 +0100
Andrea Merello <andrea.merello@...il.com> wrote:

> This patch adds ABI documentation for the new "serial_number" sysfs
> attribute. The first user is the bno055 IIO driver.
> 
> Signed-off-by: Andrea Merello <andrea.merello@....it>
> ---
>  Documentation/ABI/testing/sysfs-bus-iio | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
> index 1b8d77577608..224585f00147 100644
> --- a/Documentation/ABI/testing/sysfs-bus-iio
> +++ b/Documentation/ABI/testing/sysfs-bus-iio
> @@ -2017,3 +2017,10 @@ Contact:	linux-iio@...r.kernel.org
>  Description:
>  		Raw (unscaled) euler angles readings. Units after
>  		application of scale are deg.
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/serial_number
> +KernelVersion:	5.17
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		16-bytes, 2-digits-per-byte, HEX-string representing the sensor
> +		unique ID number.
This might prove too restrictive for other devices but I guess we can update
the help text when they come along.  Maybe relax this to

An example format is 16-bytes, 2-digits-per-byte ....

then we avoid having to update it later when a different format comes along.