staging:iio:documentation: document filter_low_pass_3db_frequency.

Add the sysfs ABI docs for all current instances of this
parameter.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/iio/Documentation/sysfs-bus-iio b/drivers/staging/iio/Documentation/sysfs-bus-iio
index 0d6823d..46a995d 100644 (file)
--- a/drivers/staging/iio/Documentation/sysfs-bus-iio
+++ b/drivers/staging/iio/Documentation/sysfs-bus-iio
@@ -276,6 +276,16 @@ Description:
                If a discrete set of scale values are available, they
                are listed in this attribute.
 
+What:          /sys/.../in_accel_filter_low_pass_3db_frequency
+What:          /sys/.../in_magn_filter_low_pass_3db_frequency
+What:          /sys/.../in_anglvel_filter_low_pass_3db_frequency
+KernelVersion: 3.2
+Contact:       linux-iio@vger.kernel.org
+Description:
+               If a known or controllable low pass filter is applied
+               to the underlying data channel, then this parameter
+               gives the 3dB frequency of the filter in Hz.
+
 What:          /sys/bus/iio/devices/iio:deviceX/out_voltageY_raw
 KernelVersion: 2.6.37
 Contact:       linux-iio@vger.kernel.org