diff --git a/arch/arm/boot/dts/rk3506.dtsi b/arch/arm/boot/dts/rk3506.dtsi
index 91edbd78f0e0..492108fd608c 100644
--- a/arch/arm/boot/dts/rk3506.dtsi
+++ b/arch/arm/boot/dts/rk3506.dtsi
@@ -40,6 +40,7 @@
 		spi1 = &spi1;
 		spi2 = &fspi;
 		spi3 = &flexbus_fspi;
+		spi4 = &flexbus_spi;
 	};
 
 	clocks {
@@ -1490,6 +1491,13 @@
 			#size-cells = <0>;
 			status = "disabled";
 		};
+
+		flexbus_spi: spi {
+			compatible = "rockchip,flexbus-spi";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "disabled";
+		};
 	};
 
 	dsmc_lb_slave: dsmc-lb-slave@ff880000 {