diff --git a/fdts/stm32mp157c-security.dtsi b/fdts/stm32mp157c-security.dtsi
new file mode 100644
index 0000000..fb04e7d
--- /dev/null
+++ b/fdts/stm32mp157c-security.dtsi
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2017-2019, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier:	GPL-2.0+	BSD-3-Clause
+ */
+
+/ {
+	soc {
+		stgen: stgen@5C008000 {
+			compatible = "st,stm32-stgen";
+			reg = <0x5C008000 0x1000>;
+			status = "okay";
+		};
+	};
+};
+
+&bsec {
+	mac_addr: mac_addr@e4 {
+		reg = <0xe4 0x6>;
+		status = "okay";
+		secure-status = "okay";
+	};
+	/* Spare field to align on 32-bit OTP granularity  */
+	spare_ns_ea: spare_ns_ea@ea {
+		reg = <0xea 0x2>;
+		status = "okay";
+		secure-status = "okay";
+	};
+	board_id: board_id@ec {
+		reg = <0xec 0x4>;
+		status = "okay";
+		secure-status = "okay";
+	};
+};