On Fri, 23 Nov 2012, Felipe Balbi wrote: > > Thanks for the example. The only problem is, how do we associate a > > regulator to a specific port in the system. > > heh, that's the 1 million dollar question, isn't it ? :-) > > that's what we need to figure out now. Luckily we have Alan Stern > helping us out ;-) Some people might think having me around to interfere was not so lucky after all... :-) First question: Should we worry about individual ports? Ordinarily I'd say No, because hubs always power up all of their ports. But with Lan Tianyu's recent work, that won't be true any more. In this case, it's conceivable that the user might want to power-off the LAN95xx in order to save energy, even though ehci-hcd is still loaded and managing other USB devices. Either way, the regulator has to be associated with _something_: either a root-hub port or the host controller itself. And this will most likely have to be done before the port's or the controller's struct device exists. Something like Andy's scheme might work. It would require the kernel to parse name strings in various formats, which could get complicated. It would be great if the difficult parts could be stuck in the PM core somewhere. 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
