diff --git a/drivers/staging/hikey9xx/hisilicon,hi6421-spmi-pmic.yaml b/drivers/staging/hikey9xx/hisilicon,hi6421-spmi-pmic.yaml
index 3b23ad56b31ac..ef664b4458fb4 100644
--- a/drivers/staging/hikey9xx/hisilicon,hi6421-spmi-pmic.yaml
+++ b/drivers/staging/hikey9xx/hisilicon,hi6421-spmi-pmic.yaml
@@ -42,6 +42,8 @@ properties:
   regulators:
     type: object
 
+    additionalProperties: false
+
     properties:
       '#address-cells':
         const: 1
@@ -50,11 +52,13 @@ properties:
         const: 0
 
     patternProperties:
-      '^ldo[0-9]+@[0-9a-f]$':
+      '^(ldo|LDO)[0-9]+$':
         type: object
 
         $ref: "/schemas/regulator/regulator.yaml#"
 
+        unevaluatedProperties: false
+
 required:
   - compatible
   - reg