stm32/h7: Defined variant identification constants

include/libopencm3/stm32/h7/memorymap.h

@@ -190,4 +190,13 @@
 #define DESIG_UNIQUE_ID1		MMIO32(DESIG_UNIQUE_ID_BASE + 4)
 #define DESIG_UNIQUE_ID2		MMIO32(DESIG_UNIQUE_ID_BASE + 8)
 
+/* These aren't strictly memory map, but they need to be visible everywhere like the memory map */
+
+/* Device variant constants */
+enum device_variant {
+	STM32H72x = 0x483U, /* RM0468 */
+	STM32H74x = 0x450U, /* RM0433, RM0399 */
+	STM32H7Bx = 0x480U, /* RM0455 */
+};
+
 #endif /*LIBOPENCM3_MEMORYMAP_H*/