diff --git a/Documentation/devicetree/bindings/display/st,stm32-ltdc.yaml b/Documentation/devicetree/bindings/display/st,stm32-ltdc.yaml
index d6ea4d62a2cf..1c3a3653579f 100644
--- a/Documentation/devicetree/bindings/display/st,stm32-ltdc.yaml
+++ b/Documentation/devicetree/bindings/display/st,stm32-ltdc.yaml
@@ -42,6 +42,12 @@ properties:
       - for internal dpi input of the MIPI DSI host controller.
       Note: These 2 endpoints cannot be activated simultaneously.
 
+  st,fb-bpp:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      bit depth of framebuffer (8, 16 or 32)
+    maxItems: 1
+
 required:
   - compatible
   - reg