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The `ad7780` driver does not implement setting/getting the sampling frequency. For the ad7780/ad7781 devices, the control is done via an external pin, and the ad7170/ad7171 devices have a fixed sampling rate (so, no control). For these devices, and similar other that may be added later on, a AD_SD_CHANNEL_NO_SAMPLE_FREQ() macro has been added, which doesn't set the IIO_CHAN_INFO_SAMP_FREQ flag. Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>