On Thu, 12 Oct 2017, Martin Blumenstingl wrote: > Hi Alan, > > On Thu, Oct 12, 2017 at 11:17 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > > On Thu, 12 Oct 2017, Martin Blumenstingl wrote: > > > >> I haven't tested the described use-case. however, this patch is not > >> supposed to change the binding for actual devices. > >> USB device numbering starts at 1, while 0 is reserved for the root-hub > >> (at least from what I know). > > > > Actually 1 is reserved for the root hub. External devices are numbered > > starting from 2. (We can't use 0 for the root hub because, as you > > said, USB device numbering starts at 1!) > I just had a look at lsusb again: > $ lsusb -t > /: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M > > however, for the devicetree bindings the devices are supposed to use 1-31: [0] > > Alan: just to make sure I understood you correctly: do you agree with > this patch? I have no idea. I haven't read the patch and I'm not familiar with the details of DeviceTree. I was just trying to clear up your misunderstanding of USB device numbering. 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
