diff --git a/Documentation/devicetree/bindings/dma/mediatek,uart-dma.yaml b/Documentation/devicetree/bindings/dma/mediatek,uart-dma.yaml
index 10fc92b60de5..4d927726df93 100644
--- a/Documentation/devicetree/bindings/dma/mediatek,uart-dma.yaml
+++ b/Documentation/devicetree/bindings/dma/mediatek,uart-dma.yaml
@@ -59,6 +59,7 @@ properties:
 
   mediatek,dma-33bits:
     type: boolean
+    deprecated: true
     description: Enable 33-bits UART APDMA support
 
 required: