diff --git a/include/libopencm3/efm32/common/rmu_common.h b/include/libopencm3/efm32/common/rmu_common.h
index 4a7e721a..96723bb5 100644
--- a/include/libopencm3/efm32/common/rmu_common.h
+++ b/include/libopencm3/efm32/common/rmu_common.h
@@ -1,3 +1,5 @@
+/** @addtogroup rmu_defines
+ */
 /*
  * This file is part of the libopencm3 project.
  *
@@ -17,12 +19,13 @@
  * along with this library.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LIBOPENCM3_EFM32_RMU_H
-#define LIBOPENCM3_EFM32_RMU_H
+#pragma once
 
 #include <libopencm3/efm32/memorymap.h>
 #include <libopencm3/cm3/common.h>
 
+/**@{*/
+
 #define RMU_CTRL		MMIO32(RMU_BASE + 0x00)
 #define RMU_RSTCAUSE	MMIO32(RMU_BASE + 0x04)
 #define RMU_CMD			MMIO32(RMU_BASE + 0x08)
@@ -52,5 +55,4 @@
 /* RMU_CMD */
 #define RMU_CMD_RCCLR	(1 << 0)
 
-#endif
-
+/**@}*/
\ No newline at end of file
diff --git a/include/libopencm3/efm32/ezr32wg/rmu.h b/include/libopencm3/efm32/ezr32wg/rmu.h
index f0eab3a9..cad039e4 100644
--- a/include/libopencm3/efm32/ezr32wg/rmu.h
+++ b/include/libopencm3/efm32/ezr32wg/rmu.h
@@ -1,3 +1,11 @@
+/** @defgroup rmu_defines RMU Defines
+ *
+ * @brief <b>Defined Constants and Types for the Reset Management Unit</b>
+ *
+ * @ingroup EZR32WG_defines
+ *
+ * LGPL License Terms @ref lgpl_license
+ */
 /*
  * This file is part of the libopencm3 project.
  *
@@ -17,9 +25,6 @@
  * along with this library.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LIBOPENCM3_EFM32_EZR32WG_RMU_H
-#define LIBOPENCM3_EFM32_EZR32WG_RMU_H
+#pragma once
 
 #include <libopencm3/efm32/common/rmu_common.h>
-
-#endif
diff --git a/include/libopencm3/efm32/lg/rmu.h b/include/libopencm3/efm32/lg/rmu.h
index 21415073..97c793f7 100644
--- a/include/libopencm3/efm32/lg/rmu.h
+++ b/include/libopencm3/efm32/lg/rmu.h
@@ -1,3 +1,11 @@
+/** @defgroup rmu_defines RMU Defines
+ *
+ * @brief <b>Defined Constants and Types for the Reset Management Unit</b>
+ *
+ * @ingroup EFM32LG_defines
+ *
+ * LGPL License Terms @ref lgpl_license
+ */
 /*
  * This file is part of the libopencm3 project.
  *
@@ -17,9 +25,6 @@
  * along with this library.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LIBOPENCM3_EFM32_LG_RMU_H
-#define LIBOPENCM3_EFM32_LG_RMU_H
+#pragma once
 
 #include <libopencm3/efm32/common/rmu_common.h>
-
-#endif
diff --git a/include/libopencm3/efm32/wg/rmu.h b/include/libopencm3/efm32/wg/rmu.h
index d2ba356b..9cc75419 100644
--- a/include/libopencm3/efm32/wg/rmu.h
+++ b/include/libopencm3/efm32/wg/rmu.h
@@ -1,3 +1,11 @@
+/** @defgroup rmu_defines RMU Defines
+ *
+ * @brief <b>Defined Constants and Types for the Reset Management Unit</b>
+ *
+ * @ingroup EFM32WG_defines
+ *
+ * LGPL License Terms @ref lgpl_license
+ */
 /*
  * This file is part of the libopencm3 project.
  *
@@ -17,9 +25,6 @@
  * along with this library.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LIBOPENCM3_EFM32_WG_RMU_H
-#define LIBOPENCM3_EFM32_WG_RMU_H
+#pragma once
 
 #include <libopencm3/efm32/common/rmu_common.h>
-
-#endif
diff --git a/lib/efm32/common/rmu_common.c b/lib/efm32/common/rmu_common.c
new file mode 100644
index 00000000..1b0a8cfd
--- /dev/null
+++ b/lib/efm32/common/rmu_common.c
@@ -0,0 +1,15 @@
+/** @addtogroup rmu_file RMU peripheral API
+ * @ingroup peripheral_apis
+ * @brief Reset Management Unit helper functions.
+ *
+ * <b>NO</b> helper functions exist. Only header definitions are available.
+ * Delete these lines if/when you add actual helper APIs.
+ * @copyright See @ref lgpl_license
+ */
+
+#include <libopencm3/efm32/rmu.h>
+
+/**@{*/
+
+/**@}*/
+
diff --git a/lib/efm32/ezr32wg/Makefile b/lib/efm32/ezr32wg/Makefile
index 7b21f0ae..5c26a76f 100644
--- a/lib/efm32/ezr32wg/Makefile
+++ b/lib/efm32/ezr32wg/Makefile
@@ -49,6 +49,7 @@ OBJS += i2c_common.o
 OBJS += letimer_common.o
 OBJS += msc_common.o
 OBJS += prs_common.o
+OBJS += rmu_common.o
 OBJS += timer_common.o
 
 OBJS += usb.o usb_control.o usb_standard.o usb_msc.o
diff --git a/lib/efm32/lg/Makefile b/lib/efm32/lg/Makefile
index 344a75ed..446c6611 100644
--- a/lib/efm32/lg/Makefile
+++ b/lib/efm32/lg/Makefile
@@ -49,6 +49,7 @@ OBJS += i2c_common.o
 OBJS += letimer_common.o
 OBJS += msc_common.o
 OBJS += prs_common.o
+OBJS += rmu_common.o
 OBJS += timer_common.o
 
 OBJS += usb.o usb_control.o usb_standard.o usb_msc.o
diff --git a/lib/efm32/wg/Makefile b/lib/efm32/wg/Makefile
index 38a2163b..596592b5 100644
--- a/lib/efm32/wg/Makefile
+++ b/lib/efm32/wg/Makefile
@@ -49,6 +49,7 @@ OBJS += i2c_common.o
 OBJS += letimer_common.o
 OBJS += msc_common.o
 OBJS += prs_common.o
+OBJS += rmu_common.o
 OBJS += timer_common.o
 
 OBJS += usb.o usb_control.o usb_standard.o usb_msc.o