diff --git a/Documentation/devicetree/bindings/serial/8250.yaml b/Documentation/devicetree/bindings/serial/8250.yaml
index e46bee8d25bf02..0a05a1647b5ccb 100644
--- a/Documentation/devicetree/bindings/serial/8250.yaml
+++ b/Documentation/devicetree/bindings/serial/8250.yaml
@@ -60,7 +60,12 @@ allOf:
           items:
             - const: uartclk
             - const: reg
-    else:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: spacemit,k1-uart
+    then:
       properties:
         clock-names:
           items:
@@ -162,6 +167,9 @@ properties:
     minItems: 1
     maxItems: 2
     oneOf:
+      - enum:
+          - main
+          - uart
       - items:
           - const: core
           - const: bus