staging: iio: adc: ad7192: Add low_pass_3db_filter_frequency
By adding this option we are able to remove the sync3 field and dt binding. When setting the required cutoff frequency we also determine the ADC configuration for chop and sync filter. Signed-off-by: NMircea Caprioru <mircea.caprioru@analog.com> Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>
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