doc: iio: Document intensity scale as poorly defined

Add comment about intensity scale being poorly defined and
having no proper units.

Signed-off-by: Marek Vasut <marex@denx.de>
Link: https://lore.kernel.org/r/20231207134200.329174-1-marex@denx.de
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index 0d3ec5fc45f2fd2423713f9a09dad9d3b8df382c..94b8d8461b7c7d4e0e1ca10ed37593658067f5a6 100644 (file)
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -618,7 +618,9 @@ KernelVersion:      2.6.35
 Contact:       linux-iio@vger.kernel.org
 Description:
                If a discrete set of scale values is available, they
-               are listed in this attribute.
+               are listed in this attribute. Unlike illumination,
+               multiplying intensity by intensity_scale does not
+               yield value with any standardized unit.
 
 What:          /sys/bus/iio/devices/iio:deviceX/out_voltageY_hardwaregain
 What:          /sys/bus/iio/devices/iio:deviceX/in_intensity_hardwaregain