diff --git a/dts/arm/st/f4/stm32f405.dtsi b/dts/arm/st/f4/stm32f405.dtsi
index 55715357409..3d8d8992304 100644
--- a/dts/arm/st/f4/stm32f405.dtsi
+++ b/dts/arm/st/f4/stm32f405.dtsi
@@ -205,6 +205,7 @@
 			interrupts = <63 0>, <64 0>, <65 0>, <66 0>;
 			interrupt-names = "TX", "RX0", "RX1", "SCE";
 			clocks = <&rcc STM32_CLOCK_BUS_APB1 0x06000000>;
+			master-can-reg = <0x40006400>;
 			status = "disabled";
 			label = "CAN_2";
 			bus-speed = <125000>;
diff --git a/dts/bindings/can/st,stm32-can.yaml b/dts/bindings/can/st,stm32-can.yaml
index d2b3f031b84..cb5293826ae 100644
--- a/dts/bindings/can/st,stm32-can.yaml
+++ b/dts/bindings/can/st,stm32-can.yaml
@@ -13,3 +13,8 @@ properties:
 
     clocks:
       required: true
+
+    master-can-reg:
+      type: int
+      required: false
+      description: master can reg when different from current instance