diff --git a/dts/arm/nxp/nxp_rt6xx.dtsi b/dts/arm/nxp/nxp_rt6xx.dtsi
index 2eed89d06da..fd6c53b10dd 100644
--- a/dts/arm/nxp/nxp_rt6xx.dtsi
+++ b/dts/arm/nxp/nxp_rt6xx.dtsi
@@ -16,7 +16,7 @@
 			ranges = <0x0 0x50000000 0x10000000>;
 		};
 		flexspi: spi@134000 {
-			reg = <0x50134000 0x1000>, <0x18000000 DT_SIZE_M(64)>;
+			reg = <0x50134000 0x1000>,<0x18000000 DT_SIZE_M(128)>;
 		};
 	};
 };
diff --git a/dts/arm/nxp/nxp_rt6xx_ns.dtsi b/dts/arm/nxp/nxp_rt6xx_ns.dtsi
index 7181ad48bcb..fafe3e9ffc4 100644
--- a/dts/arm/nxp/nxp_rt6xx_ns.dtsi
+++ b/dts/arm/nxp/nxp_rt6xx_ns.dtsi
@@ -16,7 +16,7 @@
 			ranges = <0x0 0x40000000 0x10000000>;
 		};
 		flexspi: spi@134000 {
-			reg = <0x40134000 0x1000>, <0x08000000 DT_SIZE_M(64)>;
+			reg = <0x40134000 0x1000>, <0x08000000 DT_SIZE_M(128)>;
 		};
 	};
 };