[PATCH v4 3/3] iio: distance: srf08: add driver ABI documentation

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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@xxxxxxxxxxxxx>
---
 .../ABI/testing/sysfs-bus-iio-distance-srf08       | 22 ++++++++++++++++++++++
 1 file changed, 22 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..0a1ca1487fa9
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-distance-srf08
@@ -0,0 +1,22 @@
+What		/sys/bus/iio/devices/iio:deviceX/sensor_sensitivity
+Date:		January 2017
+KernelVersion:	4.11
+Contact:	linux-iio@xxxxxxxxxxxxxxx
+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@xxxxxxxxxxxxxxx
+Description:
+                Show or set the maximum range between the sensor and the
+		first object echoed in meters. Default value is 6.020.
+		This setting limits the time the driver is waiting for a
+		echo.
+		Showing the range of available values is represented as the
+		minimum value, the step and the maximum value, all enclosed
+		in square brackets.
+		Example:
+		[0.043 0.043 11.008]
-- 
2.1.4

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