PM: domains: fix some kernel-doc issues

Fix the following make W=1 kernel build warnings:

  drivers/base/power/domain_governor.c:259: warning: Function parameter or member 'now' not described in '_default_power_down_ok'
  drivers/base/power/domain.c:581: warning: Function parameter or member 'depth' not described in 'genpd_power_off'
  drivers/base/power/domain.c:2520: warning: Function parameter or member 'np' not described in 'of_genpd_remove_last'
  drivers/base/power/domain.c:2520: warning: Excess function parameter 'provider' description in 'of_genpd_remove_last'

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/base/power/domain.c

@@ -572,6 +572,7 @@ static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
  * RPM status of the releated device is in an intermediate state, not yet turned
  * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not
  * be RPM_SUSPENDED, while it tries to power off the PM domain.
+ * @depth: nesting count for lockdep.
  *
  * If all of the @genpd's devices have been suspended and all of its subdomains
  * have been powered down, remove power from @genpd.
@@ -2505,7 +2506,7 @@ EXPORT_SYMBOL_GPL(of_genpd_remove_subdomain);
 
 /**
  * of_genpd_remove_last - Remove the last PM domain registered for a provider
- * @provider: Pointer to device structure associated with provider
+ * @np: Pointer to device node associated with provider
  *
  * Find the last PM domain that was added by a particular provider and
  * remove this PM domain from the list of PM domains. The provider is

drivers/base/power/domain_governor.c

@@ -252,6 +252,7 @@ static bool __default_power_down_ok(struct dev_pm_domain *pd,
 /**
  * _default_power_down_ok - Default generic PM domain power off governor routine.
  * @pd: PM domain to check.
+ * @now: current ktime.
  *
  * This routine must be executed under the PM domain's lock.
  */