device_find_any_child
child = device_find_any_child(dev);
struct device *child __free(put_device) = device_find_any_child(dev);
struct device *child = device_find_any_child(&wwandev->dev);
child_dev = device_find_any_child(&pdev->dev);
while ((dev = device_find_any_child(dev))) {
child = device_find_any_child(&ctlr->dev);
child = device_find_any_child(&ctlr->dev);
dev = device_find_any_child(&conn->dev);