[PATCH] iio: ABI: add clarification for proximity

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Signed-off-by: Vlad Dogaru <vlad.dogaru@xxxxxxxxx>
---
 Documentation/ABI/testing/sysfs-bus-iio | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index df5e69e..831db86 100644
--- 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
-- 
1.9.1

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