Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: [RFD] PM: Device tree representation of power domains | Date | Thu, 5 Jul 2012 22:17:47 +0200 |
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On Wednesday, July 04, 2012, Mark Brown wrote: > On Tue, Jul 03, 2012 at 11:02:17PM +0200, Rafael J. Wysocki wrote: > > > I actually don't have any ideas how to do that at the moment, but I wonder > > if anyone has already thought about it? > > > For one, I don't think that representing a power domain as a platform device > > would be a good approach and I'm not sure how to represent the relationships > > between devices and the domains they belong to. > > I guess the OMAP hwmod stuff is the closest thing we've got at the > minute (I don't recall seeing any other implementations in mainline) but > the hwmods themselves don't appear in the DTS right now. They have a > ti,hwmods property on each device naming the hwmod it's in, something > like that seems like a reasonable approach, possibly a reference to > another DT node rather than or as well as a string? That seems fairly > easy.
Well, it looks like (and please tell me if I'm wrong) the hwmons are just string attributes that are parsed by the platform-specific code through a platform bus type notifier.
We could do that for power domains too, but then each platform wanting to use them would need to implement such a notifier and add its own routine for parsing those strings. Would that be acceptable to everyone concerned?
Rafael
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