static int ad9467_read_avail(struct adi_axi_adc_conv *conv,
			     struct iio_chan_spec const *chan,
			     const int **vals, int *type, int *length,
			     long mask)
static int ad9467_read_avail(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     const int **vals, int *type, int *length,
			     long mask)