iio: improve IIO_CONCENTRATION channel type description

[ Upstream commit df16c33a4028159d1ba8a7061c9fa950b58d1a61 ]

IIO_CONCENTRATION together with INFO_RAW specifier is used for reporting
raw concentrations of pollutants. Raw value should be meaningless
before being properly scaled. Because of that description shouldn't
mention raw value unit whatsoever.

Fix this by rephrasing existing description so it follows conventions
used throughout IIO ABI docs.

Fixes: 8ff6b3bc94930 ("iio: chemical: Add IIO_CONCENTRATION channel type")
Signed-off-by: Tomasz Duszynski <tomasz.duszynski@octakon.com>
Acked-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index 64e65450f4833073cb03c77a89e5a4b1c995f104..e21e2ca3e4f91e1c418fbdfd59922ceb1363e29c 100644 (file)
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -1524,7 +1524,8 @@ What:             /sys/bus/iio/devices/iio:deviceX/in_concentrationX_voc_raw
 KernelVersion: 4.3
 Contact:       linux-iio@vger.kernel.org
 Description:
-               Raw (unscaled no offset etc.) percentage reading of a substance.
+               Raw (unscaled no offset etc.) reading of a substance. Units
+               after application of scale and offset are percents.
 
 What:          /sys/bus/iio/devices/iio:deviceX/in_resistance_raw
 What:          /sys/bus/iio/devices/iio:deviceX/in_resistanceX_raw