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  /* Power management callback function prototypes */

  #ifdef CONFIG_PM
  static void xyz_pm_notify(struct pm_callback_s *cb, int domain,
                            enum pm_state_e pmstate);
  static int xyz_pm_prepare(struct pm_callback_s *cb, int domain,
                            enum pm_state_e pmstate);
  #endif

  /* Power management callback function vtable */

  #ifdef CONFIG_PM
  static struct pm_callback_s g_xyz_pmcb =
  {
    .notify  = xyz_pm_notify,
    .prepare = xyz_pm_prepare,
  };
  #endif

  /* Register to receive power management callbacks */

  int ret = pm_register(&g_xyz_pmcb);