On Fri, Mar 11, 2011 at 08:56:42AM -0800, Greg KH wrote: > On Fri, Mar 11, 2011 at 04:48:50PM +0000, Mark Brown wrote: > > USB itself is discoverable but the when the USB bus you're looking at is > > one that's soldered down onto a board in a specific design all bets are > > off regarding how complete the information you get will be. On a basic > > level the designers may have done things like omit the configuration > > EEPROMs that would set the device IDs that the driver should be relying > > on to identify the hardware configuration. There may be other, nastier, > > things going on. > Then you use the existing platform data for your USB host controller > driver. Doesn't that work today just fine? Wrong end of the bus. This stuff is simple enough to deal with in a system specific fashion, the standard solution would be to patch the relevant drivers to hard code whatever is required. > > You really can't make this assumption about discoverable buses on > > embedded devices. The discoverability will get you most of the way > > there but not always all of the way there. > Then the bus is not really USB, sorry. USB is discoverable, _and_ can > support enumeration in non-deterministic ways. If people are using it > in other ways then it is not USB and is something else. That's certainly a valid way of looking at things but it doesn't really move mainline support for systems which do stuff like this forward. On the bright side I don't generally have to work on this stuff myself :) -- 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
