diff --git a/Documentation/devicetree/bindings/arm/rockchip/pmu.yaml b/Documentation/devicetree/bindings/arm/rockchip/pmu.yaml
index 55b2200d6e75..1cff2328cd01 100644
--- a/Documentation/devicetree/bindings/arm/rockchip/pmu.yaml
+++ b/Documentation/devicetree/bindings/arm/rockchip/pmu.yaml
@@ -61,7 +61,13 @@ properties:
     type: object
 
   reboot-mode:
-    type: object
+    $ref: /schemas/power/reset/syscon-reboot-mode.yaml
+    unevaluatedProperties: false
+
+    patternProperties:
+      # Negative look-ahead to disallow unsupported modes. The '$' has to be
+      # part of lookahead group to work, instead of trailing outside of ().
+      "^mode-(?!(bootloader$|loader$|normal$|recovery$))": false
 
 required:
   - compatible
diff --git a/Documentation/devicetree/bindings/soc/rockchip/grf.yaml b/Documentation/devicetree/bindings/soc/rockchip/grf.yaml
index 2cc43742b8e3..7bcb4e2f47ec 100644
--- a/Documentation/devicetree/bindings/soc/rockchip/grf.yaml
+++ b/Documentation/devicetree/bindings/soc/rockchip/grf.yaml
@@ -239,11 +239,14 @@ allOf:
       properties:
         reboot-mode:
           type: object
-
           $ref: /schemas/power/reset/syscon-reboot-mode.yaml#
-
           unevaluatedProperties: false
 
+          patternProperties:
+            # Negative look-ahead to disallow unsupported modes. The '$' has to be
+            # part of lookahead group to work, instead of trailing outside of ().
+            "^mode-(?!(bootloader$|fastboot$|loader$|normal$|recovery$))": false
+
   - if:
       properties:
         compatible: