diff --git a/doc/guides/dts/macros.bnf b/doc/guides/dts/macros.bnf
index 504b357a3be..5309cf1f81b 100644
--- a/doc/guides/dts/macros.bnf
+++ b/doc/guides/dts/macros.bnf
@@ -67,6 +67,8 @@ node-macro =/ %s"DT_N" path-id %s"_FOREACH_CHILD_VARGS"
 ; over each child node with status "okay".
 node-macro =/ %s"DT_N" path-id %s"_FOREACH_CHILD_STATUS_OKAY"
 node-macro =/ %s"DT_N" path-id %s"_FOREACH_CHILD_STATUS_OKAY_VARGS"
+; The node's zero-based index in the list of it's parent's child nodes.
+node-macro =/ %s"DT_N" path-id %s"_CHILD_IDX"
 ; The node's status macro; dt-name in this case is something like "okay"
 ; or "disabled".
 node-macro =/ %s"DT_N" path-id %s"_STATUS_" dt-name
diff --git a/scripts/dts/gen_defines.py b/scripts/dts/gen_defines.py
index 5c3b950a9a8..f8d72ede78f 100755
--- a/scripts/dts/gen_defines.py
+++ b/scripts/dts/gen_defines.py
@@ -132,6 +132,10 @@ def main():
                 out_dt_define(f"{node.z_path_id}_PARENT",
                               f"DT_{node.parent.z_path_id}")
 
+                out_comment(f"Node's index in its parent's list of children:")
+                out_dt_define(f"{node.z_path_id}_CHILD_IDX",
+                              node.parent.child_index(node))
+
             write_children(node)
             write_dep_info(node)
             write_idents_and_existence(node)