diff --git a/include/dt-bindings/soc/st,stm32-etzpc.h b/include/dt-bindings/soc/st,stm32-etzpc.h
new file mode 100644
index 0000000..3f9fb3b
--- /dev/null
+++ b/include/dt-bindings/soc/st,stm32-etzpc.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2017-2020, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
+ */
+
+#ifndef _DT_BINDINGS_STM32_ETZPC_H
+#define _DT_BINDINGS_STM32_ETZPC_H
+
+/* DECPROT modes */
+#define DECPROT_S_RW		0x0
+#define DECPROT_NS_R_S_W	0x1
+#define DECPROT_MCU_ISOLATION	0x2
+#define DECPROT_NS_RW		0x3
+
+/* DECPROT lock */
+#define DECPROT_UNLOCK		0x0
+#define DECPROT_LOCK		0x1
+
+#endif /* _DT_BINDINGS_STM32_ETZPC_H */