diff --git a/Documentation/devicetree/bindings/iommu/mediatek,iommu.yaml b/Documentation/devicetree/bindings/iommu/mediatek,iommu.yaml
index b9946809fc2b..ba6626347381 100644
--- a/Documentation/devicetree/bindings/iommu/mediatek,iommu.yaml
+++ b/Documentation/devicetree/bindings/iommu/mediatek,iommu.yaml
@@ -99,7 +99,7 @@ properties:
   mediatek,larbs:
     $ref: /schemas/types.yaml#/definitions/phandle-array
     minItems: 1
-    maxItems: 16
+    maxItems: 32
     description: |
       List of phandle to the local arbiters in the current Socs.
       Refer to bindings/memory-controllers/mediatek,smi-larb.yaml. It must sort
diff --git a/include/dt-bindings/memory/mtk-memory-port.h b/include/dt-bindings/memory/mtk-memory-port.h
index 53354cf4f6e3..7d64103209af 100644
--- a/include/dt-bindings/memory/mtk-memory-port.h
+++ b/include/dt-bindings/memory/mtk-memory-port.h
@@ -6,10 +6,10 @@
 #ifndef __DT_BINDINGS_MEMORY_MTK_MEMORY_PORT_H_
 #define __DT_BINDINGS_MEMORY_MTK_MEMORY_PORT_H_
 
-#define MTK_LARB_NR_MAX			16
+#define MTK_LARB_NR_MAX			32
 
 #define MTK_M4U_ID(larb, port)		(((larb) << 5) | (port))
-#define MTK_M4U_TO_LARB(id)		(((id) >> 5) & 0xf)
+#define MTK_M4U_TO_LARB(id)		(((id) >> 5) & 0x1f)
 #define MTK_M4U_TO_PORT(id)		((id) & 0x1f)
 
 #endif