Re: [RFC][PATCH] Power domains for platform bus type

From: Kevin Hilman
Date: Mon Jan 31 2011 - 19:17:12 EST

"Rafael J. Wysocki" <rjw@xxxxxxx> writes:

> Hi,
> This is something we discussed during the last Linux Plumbers Conference.
> The problem appears to be that the same device may be used in different
> systems in different configurations such that actions necessary for the
> device's power management can vary from one system to another. In those
> cases the drivers' power management callbacks are generally not sufficient,
> because they can't take the configuration of the whole system into account.
> I think this issue may be addressed by adding objects that will represent
> power domains and will provide power management callbacks to be executed
> in addition to the device driver's PM callbacks, which is done by the patch
> below.
> Please have a look at it and tell me what you think.

FYI... I just tested this patch on OMAP by converting our existing use
of platform_bus_set_ops() to use this approach by adding a powerdomain
to each omap_device.

Note we're currently only overriding the runtime_[suspend|resume]
methods, so those are the only paths I've tested.

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