[v3 2/9] Documentation: ABI: document IIO in_temp_filter_notch_center_frequency file

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max31856 IIO driver introduced a new attribute
"in_temp_filter_notch_center_frequency".
This patch adds it to the list of documented ABI for sysfs-bus-iio

Cc: Hartmut Knaack <knaack.h@xxxxxx>
Cc: Lars-Peter Clausen <lars@xxxxxxxxxx>
Cc: Peter Meerwald-Stadler <pmeerw@xxxxxxxxxx>
Cc: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Cc: Patrick Havelange <patrick.havelange@xxxxxxxxxxxxx>
Cc: Matt Weber <matthew.weber@xxxxxxxxxxxxxxxxxxx>
Cc: Matt Ranostay <matt.ranostay@xxxxxxxxxxxx>
Cc: Chuhong Yuan <hslester96@xxxxxxxxx>
Cc: Daniel Gomez <dagmcr@xxxxxxxxx>
Cc: linux-iio@xxxxxxxxxxxxxxx
Signed-off-by: Andrea Merello <andrea.merello@xxxxxxxxx>
---
 Documentation/ABI/testing/sysfs-bus-iio | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index faaa2166d741..94f7eb675108 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -1726,3 +1726,10 @@ Contact:	linux-iio@xxxxxxxxxxxxxxx
 Description:
 		List of valid periods (in seconds) for which the light intensity
 		must be above the threshold level before interrupt is asserted.
+
+What:		/sys/bus/iio/devices/iio:deviceX/in_filter_notch_center_frequency
+KernelVersion:	5.5
+Contact:	linux-iio@xxxxxxxxxxxxxxx
+Description:
+		Center frequency in Hz for a notch filter. Used i.e. for line
+		noise suppression.
-- 
2.17.1




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