diff --git a/drivers/staging/hikey9xx/hisilicon,hi6421-spmi-pmic.yaml b/drivers/staging/hikey9xx/hisilicon,hi6421-spmi-pmic.yaml
index f385146d2bd1..3b23ad56b31a 100644
--- a/drivers/staging/hikey9xx/hisilicon,hi6421-spmi-pmic.yaml
+++ b/drivers/staging/hikey9xx/hisilicon,hi6421-spmi-pmic.yaml
@@ -60,6 +60,8 @@ required:
   - reg
   - regulators
 
+additionalProperties: false
+
 examples:
   - |
     /* pmic properties */