linux-kernel - Re: [PATCH v3 3/3] iio: distance: srf08: add driver ABI documentation

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Date:   Sun, 22 Jan 2017 13:41:02 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Andreas Klinger <ak@...klinger.de>, knaack.h@....de,
        lars@...afoo.de, pmeerw@...erw.net, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, ktsai@...ellamicro.com,
        wsa@...-dreams.de, robh+dt@...nel.org, pawel.moll@....com,
        mark.rutland@....com, ijc+devicetree@...lion.org.uk,
        galak@...eaurora.org, trivial@...nel.org, mranostay@...il.com,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 3/3] iio: distance: srf08: add driver ABI documentation

On 17/01/17 13:50, Andreas Klinger wrote:
> Add sysfs-bus-iio-distance-srf08 for individual attributes of the driver,
> especially:
>  - sensitivity which the device documentation calls gain for amplifying the
>    signal
>  - max_range for limiting the maximum distance for expected echos and
>    therefore limiting the time waiting for telegrams
> 
> Signed-off-by: Andreas Klinger <ak@...klinger.de>
> ---
>  .../ABI/testing/sysfs-bus-iio-distance-srf08       | 27 ++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
>  create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-distance-srf08
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio-distance-srf08 b/Documentation/ABI/testing/sysfs-bus-iio-distance-srf08
> new file mode 100644
> index 000000000000..e96c28064748
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-bus-iio-distance-srf08
> @@ -0,0 +1,27 @@
> +What		/sys/bus/iio/devices/iio:deviceX/in_distance_raw
> +Date:		January 2017
> +KernelVersion:	4.11
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Get the current distance in meters between the sensor and
> +		the first object recognized
Generally no need to document what are effectively standard elements.
Just leads to the possibility of disagreements in the docs! 
Still no harm here really.
> +
> +What		/sys/bus/iio/devices/iio:deviceX/sensor_sensitivity
> +Date:		January 2017
> +KernelVersion:	4.11
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Show or set the gain boost of the amp, from 0-31 range.
> +		default 31
> +
> +What		/sys/bus/iio/devices/iio:deviceX/sensor_max_range
> +Date:		January 2017
> +KernelVersion:	4.11
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Show or set the maximum range between the sensor and the
> +		first object echoed in millimeters.
> +		This setting limits the time the driver is waiting for a
> +		echo.
> +		Can be set between 43 and 11008 in a grid of 43 mm.
> +		default 6020
This needs to be in the same units as the range - so m.
I'm not 100% sure this is the best ABI we can do for this. However, supporting
this as a legacy abi if we come up with something more general will be a very
small burden, so lets not stall the driver on this!

Jonathan
>