On Fri, 1 Nov 2013, Valentine wrote: > The USB HDC PCI deferred probing could be used on R-Car. But I'm not sure how to make a particular > PCI USB HDC device attached to a particular PCI host controller on a particular SoC defer its probing > while waiting for the USB phy. At the same time other identical PCI USB HCD devices (with the same PCI id) > on the same SoC should be probed as usual. That is the hard part. That's what we need to discuss. And not just on the linux-usb mailing list. Get other people (especially PCI people) involved too. > We can't use PCI ids here to distinguish between PCI USB HCD devices. Neither can we use PCI busses > to distinguish between PCI host controllers, since bus numbers are assigned dynamically. There must be some way for you to tell which PCI devices use the PHY. But I'm not a PCI expert, and I'm not familiar with your platform. > It looks that it's quite hard to do that without bigger hacks in the PCI USB HCD driver that are > most likely not to be used on any other platforms except for R-Car. You never know what will happen in the future. Besides, even if nobody else needs to do this for a PCI device, you can be certain that the same sort of thing will be needed for devices on other buses. A suitably general solution would help them too. 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
