On Fri, Feb 28, 2014 at 02:28:04PM +0800, Huang Shijie wrote:
> 于 2014年02月28日 14:13, Mark Brown 写道:
> > little while after the last use has finished?  That's a little more
> > involved though and would still need this due to runtime PM being

> yes. we can use the runtime PM too.

> but i am not sure which one is _better_. the runtime PM? or the current way?

If you are able to unprepare the clocks then depending on the system
that may allow more power savings so if runtime PM solves a performance
problem it's going to be better for that.  Similarly if the SoC does
something with runtime PM (eg, powering down power domains) then that'd
be helpful but that depends on the SoC.