Re: [PATCH 16/16] ARM: OMAP: omap4panda: Power down the USB PHY and ETH when not in use

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On Thu, 22 Nov 2012, Felipe Balbi wrote:

> > The latter, more or less.  For example, maybe we can tell usbcore
> > somehow that regulator X is in control of a device attached to host
> > controller Y (not sure how we would express X and Y though).  Then when
> > usb_add_hcd() sees that the host controller being added is Y, it will
> > know to turn on regulator X.  Similarly for usb_remove_hcd().
> 
> that'd look very nice indeed. Perhaps we could even take care of such
> details for the roothub, even. Maybe some systems might show up where
> roothub need external regulators provided by e.g. PMIC ?!?

As far as I can see, that ought to work provided the controller's 
platform driver is careful not to access the controller hardware before 
calling usb_add_hcd().

And maybe the same sort of scheme could be used for clocks, although I 
don't know how to do it in a generic way that will work on all 
platforms.

Alan Stern

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