diff --git a/Documentation/devicetree/bindings/timer/renesas,tmu.txt b/Documentation/devicetree/bindings/timer/renesas,tmu.txt
index 9dff7e5cae6aab..29159f4e65abec 100644
--- a/Documentation/devicetree/bindings/timer/renesas,tmu.txt
+++ b/Documentation/devicetree/bindings/timer/renesas,tmu.txt
@@ -11,6 +11,7 @@ Required Properties:
   - compatible: must contain one or more of the following:
     - "renesas,tmu-r8a7740" for the r8a7740 TMU
     - "renesas,tmu-r8a774a1" for the r8a774A1 TMU
+    - "renesas,tmu-r8a774b1" for the r8a774B1 TMU
     - "renesas,tmu-r8a774c0" for the r8a774C0 TMU
     - "renesas,tmu-r8a7778" for the r8a7778 TMU
     - "renesas,tmu-r8a7779" for the r8a7779 TMU