diff --git a/data.c b/data.c
index 913796f..5b25aa0 100644
--- a/data.c
+++ b/data.c
@@ -251,6 +251,33 @@ bool data_is_one_string(struct data d)
 	return true;
 }
 
+struct data data_insert_data(struct data d, struct marker *m, struct data old)
+{
+	unsigned int offset = m->offset;
+	struct marker *next = m->next;
+	struct marker *marker;
+	struct data new_data;
+	char *ref;
+
+	new_data = data_insert_at_marker(d, m, old.val, old.len);
+
+	/* Copy all markers from old value */
+	marker = old.markers;
+	for_each_marker(marker) {
+		ref = NULL;
+
+		if (marker->ref)
+			ref = xstrdup(marker->ref);
+
+		m->next = alloc_marker(marker->offset + offset, marker->type,
+				       ref);
+		m = m->next;
+	}
+	m->next = next;
+
+	return new_data;
+}
+
 struct marker *alloc_marker(unsigned int offset, enum markertype type,
 			    char *ref)
 {
diff --git a/dtc.h b/dtc.h
index bd80339..3a220b9 100644
--- a/dtc.h
+++ b/dtc.h
@@ -182,6 +182,7 @@ struct data data_append_addr(struct data d, uint64_t addr);
 struct data data_append_byte(struct data d, uint8_t byte);
 struct data data_append_zeroes(struct data d, int len);
 struct data data_append_align(struct data d, int align);
+struct data data_insert_data(struct data d, struct marker *m, struct data old);
 
 struct marker *alloc_marker(unsigned int offset, enum markertype type,
 			    char *ref);