diff --git a/drivers/pmdomain/mediatek/mtk-pm-domains.c b/drivers/pmdomain/mediatek/mtk-pm-domains.c
index 0ebe7379b94e..9c9323c8c93a 100644
--- a/drivers/pmdomain/mediatek/mtk-pm-domains.c
+++ b/drivers/pmdomain/mediatek/mtk-pm-domains.c
@@ -748,6 +748,18 @@ static void scpsys_domain_cleanup(struct scpsys *scpsys)
 	}
 }
 
+static struct device_node *scpsys_get_legacy_regmap(struct device_node *np, const char *pn)
+{
+	struct device_node *local_node;
+
+	for_each_child_of_node(np, local_node) {
+		if (of_property_present(local_node, pn))
+			return local_node;
+	}
+
+	return NULL;
+}
+
 static int scpsys_get_bus_protection_legacy(struct device *dev, struct scpsys *scpsys)
 {
 	const u8 bp_blocks[3] = {
@@ -769,7 +781,7 @@ static int scpsys_get_bus_protection_legacy(struct device *dev, struct scpsys *s
 	 * this makes it then possible to allocate the array of bus_prot
 	 * regmaps and convert all to the new style handling.
 	 */
-	node = of_find_node_with_property(np, "mediatek,infracfg");
+	node = scpsys_get_legacy_regmap(np, "mediatek,infracfg");
 	if (node) {
 		regmap[0] = syscon_regmap_lookup_by_phandle(node, "mediatek,infracfg");
 		of_node_put(node);
@@ -782,7 +794,7 @@ static int scpsys_get_bus_protection_legacy(struct device *dev, struct scpsys *s
 		regmap[0] = NULL;
 	}
 
-	node = of_find_node_with_property(np, "mediatek,smi");
+	node = scpsys_get_legacy_regmap(np, "mediatek,smi");
 	if (node) {
 		smi_np = of_parse_phandle(node, "mediatek,smi", 0);
 		of_node_put(node);
@@ -800,7 +812,7 @@ static int scpsys_get_bus_protection_legacy(struct device *dev, struct scpsys *s
 		regmap[1] = NULL;
 	}
 
-	node = of_find_node_with_property(np, "mediatek,infracfg-nao");
+	node = scpsys_get_legacy_regmap(np, "mediatek,infracfg-nao");
 	if (node) {
 		regmap[2] = syscon_regmap_lookup_by_phandle(node, "mediatek,infracfg-nao");
 		num_regmaps++;