RE: [PATCH] PM: sleep: Add helpers to allow a device to remain powered-on

[Peng Fan]

> Subject: [PATCH] PM: sleep: Add helpers to allow a device to remain
> powered-on
> 
> On some platforms a device and its corresponding PM domain, may need to
> remain powered-on during system wide suspend, to support various use
> cases.
> For example, when the console_suspend_enabled flag is unset for a serial
> controller, the corresponding device may need to remain powered on.
> Other use cases exists too.
> 
> In fact, we already have the mechanism in the PM core to deal with these
> kind of use cases. However, the current naming of the corresponding
> functions/flags clearly suggests these should be use for system wakeup.
> See device_wakeup_path(), device_set_wakeup_path and
> dev->power.wakeup_path.
> 
> As a way to extend the use of the existing mechanism, let's introduce two
> new helpers functions, device_awake_path() and device_set_awake_path().
> At this point, let them act as wrappers of the existing functions. Ideally,
> when all users have been converted to use the new helpers, we may decide
> to drop the old ones and rename the flag.
> 
> Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>

Reviewed-by: Peng Fan <peng.fan@xxxxxxx>