Messages in this thread | | | Date | Sat, 31 Mar 2007 09:53:43 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: [PATCH v2] Add suspend/resume for HPET |
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On Sat, 31 Mar 2007, Thomas Gleixner wrote: > > Right, but clock - sources/events need to be extremly late suspended and > early resumed. How can we ensure this ?
Make them be at the top of the device tree by adding them early. That's the whole point of the device tree after all - we have an ordering that is enforced by its topology, and that we sort by when things were added.
Right now the way things work is (iirc - somebody like Greg should double-check me) is that we add all devices to the power list at device_add() time by traversing the devices fromt he root all the way out, and doing a device_add() which does a device_pm_add(), which in turn adds it to the power-management list - so that the list is always topologically sorted.
So the only thing that needs to be done is to make sure that we add the timer devices early during bootup - something we have to do *anyway*. If a device is added early in bootup, that automatically means that it will be suspended late, and resumed early - because we maintain that order all the way through..
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