iio: ABI: add clarification for proximity

Signed-off-by: Vlad Dogaru <vlad.dogaru@intel.com>
Acked-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index df5e69e6247c44f06330c3f0040b7c73724c5d18..831db8623e4b71dc6dc777022ad25364716e3020 100644 (file)
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -1068,7 +1068,9 @@ Description:
                reflectivity of infrared or ultrasound emitted.
                Often these sensors are unit less and as such conversion
                to SI units is not possible.  Where it is, the units should
-               be meters.
+               be meters.  If such a conversion is not possible, the reported
+               values should behave in the same way as a distance, i.e. lower
+               values indicate something is closer to the sensor.
 
 What:          /sys/.../iio:deviceX/in_illuminanceY_input
 What:          /sys/.../iio:deviceX/in_illuminanceY_raw