+int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
+ bool find_req_seq, struct udevice **devp)
+{
+ struct udevice *dev;
+
+ *devp = NULL;
+ if (seq_or_req_seq == -1)
+ return -ENODEV;
+
+ list_for_each_entry(dev, &parent->child_head, sibling_node) {
+ if ((find_req_seq ? dev->req_seq : dev->seq) ==
+ seq_or_req_seq) {
+ *devp = dev;
+ return 0;
+ }
+ }
+
+ return -ENODEV;
+}
+
+int device_get_child_by_seq(struct udevice *parent, int seq,
+ struct udevice **devp)
+{
+ struct udevice *dev;
+ int ret;
+
+ *devp = NULL;
+ ret = device_find_child_by_seq(parent, seq, false, &dev);
+ if (ret == -ENODEV) {
+ /*
+ * We didn't find it in probed devices. See if there is one
+ * that will request this seq if probed.
+ */
+ ret = device_find_child_by_seq(parent, seq, true, &dev);
+ }
+ return device_get_device_tail(dev, ret, devp);
+}
+
+int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
+ struct udevice **devp)
+{
+ struct udevice *dev;
+
+ *devp = NULL;
+
+ list_for_each_entry(dev, &parent->child_head, sibling_node) {
+ if (dev->of_offset == of_offset) {
+ *devp = dev;
+ return 0;
+ }
+ }
+
+ return -ENODEV;
+}
+
+int device_get_child_by_of_offset(struct udevice *parent, int node,
+ struct udevice **devp)
+{
+ struct udevice *dev;
+ int ret;
+
+ *devp = NULL;
+ ret = device_find_child_by_of_offset(parent, node, &dev);
+ return device_get_device_tail(dev, ret, devp);
+}
+
+static struct udevice *_device_find_global_by_of_offset(struct udevice *parent,
+ int of_offset)
+{
+ struct udevice *dev, *found;
+
+ if (parent->of_offset == of_offset)
+ return parent;
+
+ list_for_each_entry(dev, &parent->child_head, sibling_node) {
+ found = _device_find_global_by_of_offset(dev, of_offset);
+ if (found)
+ return found;
+ }
+
+ return NULL;
+}
+
+int device_get_global_by_of_offset(int of_offset, struct udevice **devp)
+{
+ struct udevice *dev;
+
+ dev = _device_find_global_by_of_offset(gd->dm_root, of_offset);
+ return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
+}
+
+int device_find_first_child(struct udevice *parent, struct udevice **devp)
+{
+ if (list_empty(&parent->child_head)) {
+ *devp = NULL;
+ } else {
+ *devp = list_first_entry(&parent->child_head, struct udevice,
+ sibling_node);
+ }