diff --git a/dts/arm/st/f7/stm32f7.dtsi b/dts/arm/st/f7/stm32f7.dtsi
index da40c51133379..caccb26b9a1f8 100644
--- a/dts/arm/st/f7/stm32f7.dtsi
+++ b/dts/arm/st/f7/stm32f7.dtsi
@@ -43,6 +43,13 @@
 		};
 	};
 
+	quadspi_memory: memory@90000000 {
+		compatible = "zephyr,memory-region", "mmio-sram";
+		reg = <0x90000000 DT_SIZE_M(256)>;
+		zephyr,memory-region = "QSPI";
+		zephyr,memory-region-mpu = "EXTMEM";
+	};
+
 	clocks {
 		clk_hse: clk-hse {
 			#clock-cells = <0>;
diff --git a/dts/arm/st/h7/stm32h7.dtsi b/dts/arm/st/h7/stm32h7.dtsi
index 5ab6e8b2c8f4f..8d646c82f0bbd 100644
--- a/dts/arm/st/h7/stm32h7.dtsi
+++ b/dts/arm/st/h7/stm32h7.dtsi
@@ -44,6 +44,13 @@
 		};
 	};
 
+	quadspi_memory: memory@90000000 {
+		compatible = "zephyr,memory-region", "mmio-sram";
+		reg = <0x90000000 DT_SIZE_M(256)>;
+		zephyr,memory-region = "QSPI";
+		zephyr,memory-region-mpu = "EXTMEM";
+	};
+
 	clocks {
 		#address-cells = <1>;
 		#size-cells = <0>;
diff --git a/dts/bindings/base/zephyr,memory-region.yaml b/dts/bindings/base/zephyr,memory-region.yaml
index a24cd7cd0a904..f9db04e2d31ee 100644
--- a/dts/bindings/base/zephyr,memory-region.yaml
+++ b/dts/bindings/base/zephyr,memory-region.yaml
@@ -25,6 +25,7 @@ properties:
       - "FLASH"
       - "PPB"
       - "IO"
+      - "EXTMEM"
     description: |
       Signify that this node should result in a dedicated MPU region. The
       region address and size are taken from the <reg> property, while the MPU
diff --git a/include/zephyr/arch/arm/aarch32/mpu/arm_mpu_v7m.h b/include/zephyr/arch/arm/aarch32/mpu/arm_mpu_v7m.h
index 67d90edb158bb..963a1dd6e0e3a 100644
--- a/include/zephyr/arch/arm/aarch32/mpu/arm_mpu_v7m.h
+++ b/include/zephyr/arch/arm/aarch32/mpu/arm_mpu_v7m.h
@@ -137,6 +137,8 @@
 #define REGION_PPB_ATTR(size) { (STRONGLY_ORDERED_SHAREABLE | size | \
 		P_RW_U_NA_Msk) }
 #define REGION_IO_ATTR(size) { (DEVICE_NON_SHAREABLE | size | P_RW_U_NA_Msk) }
+#define REGION_EXTMEM_ATTR(size) { (STRONGLY_ORDERED_SHAREABLE | size | \
+		NO_ACCESS_Msk) }
 
 struct arm_mpu_region_attr {
 	/* Attributes belonging to RASR (including the encoded region size) */