diff --git a/scripts/dts/gen_defines.py b/scripts/dts/gen_defines.py
index ea80802..30a93a1 100755
--- a/scripts/dts/gen_defines.py
+++ b/scripts/dts/gen_defines.py
@@ -507,10 +507,14 @@
     # about whether edtlib / Zephyr's binding language recognizes
     # them. The compatibles the node provides are what is important.
 
-    for compat in node.compats:
+    for i, compat in enumerate(node.compats):
         out_dt_define(
             f"{node.z_path_id}_COMPAT_MATCHES_{str2ident(compat)}", 1)
 
+        if node.edt.compat2vendor[compat]:
+            out_dt_define(f"{node.z_path_id}_COMPAT_VENDOR_IDX_{i}_EXISTS", 1)
+            out_dt_define(f"{node.z_path_id}_COMPAT_VENDOR_IDX_{i}",
+                          quote_str(node.edt.compat2vendor[compat]))
 
 def write_children(node):
     # Writes helper macros for dealing with node's children.