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 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
