rpmsg_chrdev_eptdev_destroy
ret = rpmsg_chrdev_eptdev_destroy(&eptdev->dev, NULL);
ret = device_for_each_child(&rpdev->dev, NULL, rpmsg_chrdev_eptdev_destroy);
EXPORT_SYMBOL(rpmsg_chrdev_eptdev_destroy);
int rpmsg_chrdev_eptdev_destroy(struct device *dev, void *data);
ret = device_for_each_child(&ctrldev->dev, NULL, rpmsg_chrdev_eptdev_destroy);