docs: iio: add precision about sampling_frequency_available

The documentation give some exemple on what format can be expected
from sampling_frequency_available sysfs attribute

Signed-off-by: Fabien Lahoudere <fabien.lahoudere@collabora.com>
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 6aef7db..6804516 100644 (file)
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -61,8 +61,11 @@ What:                /sys/bus/iio/devices/triggerX/sampling_frequency_available
 KernelVersion: 2.6.35
 Contact:       linux-iio@vger.kernel.org
 Description:
-               When the internal sampling clock can only take a small
-               discrete set of values, this file lists those available.
+               When the internal sampling clock can only take a specific set of
+               frequencies, we can specify the available values with:
+               - a small discrete set of values like "0 2 4 6 8"
+               - a range with minimum, step and maximum frequencies like
+                 "[min step max]"
 
 What:          /sys/bus/iio/devices/iio:deviceX/oversampling_ratio
 KernelVersion: 2.6.38