devm_iio_backend_enable
ret = devm_iio_backend_enable(dev, st->back[ch]);
ret = devm_iio_backend_enable(dev, st->back);
ret = devm_iio_backend_enable(dev, st->back);
ret = devm_iio_backend_enable(dev, st->back);
ret = devm_iio_backend_enable(dev, st->back);
ret = devm_iio_backend_enable(dev, st->back);
ret = devm_iio_backend_enable(dev, st->back);
ret = devm_iio_backend_enable(&pdev->dev, st->back);
ret = devm_iio_backend_enable(dev, st->back);
EXPORT_SYMBOL_NS_GPL(devm_iio_backend_enable, "IIO_BACKEND");
int devm_iio_backend_enable(struct device *dev, struct iio_backend *back);