2 files changed, 18 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/common/up_initialize.c b/nuttx/arch/arm/src/common/up_initialize.c
index 130f0721f..8bf530fda 100644
--- a/nuttx/arch/arm/src/common/up_initialize.c
+++ b/nuttx/arch/arm/src/common/up_initialize.c
@@ -126,6 +126,16 @@ void up_initialize(void)
 
   up_irqinitialize();
 
+  /* Initialize the power management subsystem.  This MCU-specific function
+   * must be called *very* early in the intialization sequence *before* any
+   * other device drivers are initialized (since they may attempt to register
+   * with the power management subsystem).
+   */
+
+#ifdef CONFIG_PM
+  up_pminitialize();
+#endif
+
   /* Initialize the DMA subsystem if the weak function stm32_dmainitialize has been
    * brought into the build
    */
diff --git a/nuttx/arch/arm/src/common/up_internal.h b/nuttx/arch/arm/src/common/up_internal.h
index f0f3d06ef..015b2b4bc 100644
--- a/nuttx/arch/arm/src/common/up_internal.h
+++ b/nuttx/arch/arm/src/common/up_internal.h
@@ -229,6 +229,14 @@ extern void up_switchcontext(uint32_t *saveregs, uint32_t *restoreregs);
 
 extern void up_sigdeliver(void);
 
+/* Power management *********************************************************/
+
+#ifdef CONFIG_PM
+extern void up_pminitialize(void);
+#else
+#  define up_pminitialize()
+#endif
+
 /* Interrupt handling *******************************************************/
 
 extern void up_irqinitialize(void);