diff --git a/dts/arm/st/u5/stm32u595Xi.dtsi b/dts/arm/st/u5/stm32u595Xi.dtsi
new file mode 100644
index 0000000000000..549bcc7df9e59
--- /dev/null
+++ b/dts/arm/st/u5/stm32u595Xi.dtsi
@@ -0,0 +1,17 @@
+/*
+ * Copyright The Zephyr Project Contributors
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include <mem.h>
+#include <st/u5/stm32u595.dtsi>
+
+/ {
+	soc {
+		flash-controller@40022000 {
+			flash0: flash@8000000 {
+				reg = <0x08000000 DT_SIZE_M(2)>;
+			};
+		};
+	};
+};
diff --git a/dts/arm/st/u5/stm32u595Xj.dtsi b/dts/arm/st/u5/stm32u595Xj.dtsi
new file mode 100644
index 0000000000000..97b64bebec0c1
--- /dev/null
+++ b/dts/arm/st/u5/stm32u595Xj.dtsi
@@ -0,0 +1,17 @@
+/*
+ * Copyright The Zephyr Project Contributors
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include <mem.h>
+#include <st/u5/stm32u595.dtsi>
+
+/ {
+	soc {
+		flash-controller@40022000 {
+			flash0: flash@8000000 {
+				reg = <0x08000000 DT_SIZE_M(4)>;
+			};
+		};
+	};
+};