__adrf6780_spi_read
ret = __adrf6780_spi_read(st, reg, val);
ret = __adrf6780_spi_read(st, reg, &data);
ret = __adrf6780_spi_read(st, ADRF6780_REG_ADC_OUTPUT, read_val);
ret = __adrf6780_spi_read(st, ADRF6780_REG_ADC_OUTPUT, read_val);
ret = __adrf6780_spi_read(st, ADRF6780_REG_CONTROL, &chip_id);