[gentoo-user] Which USB device on which controller?

[Grant]

My system seems to have 2 USB controllers, one 1.1 controller (OHCI)
and one 2.0 controller (EHCI):

00:02.0 USB Controller: nVidia Corporation MCP61 USB Controller (rev
a3) (prog-if 10 [OHCI])
        Subsystem: Micro-Star International Co., Ltd. Device 7309
        Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 21
        Memory at dfe7f000 (32-bit, non-prefetchable) [size=4K]
        Capabilities: [44] Power Management version 2
        Kernel driver in use: ohci_hcd

00:02.1 USB Controller: nVidia Corporation MCP61 USB Controller (rev
a3) (prog-if 20 [EHCI])
        Subsystem: Micro-Star International Co., Ltd. Device 7309
        Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 22
        Memory at dfe7ec00 (32-bit, non-prefetchable) [size=256]
        Capabilities: [44] Debug port: BAR=1 offset=0098
        Capabilities: [80] Power Management version 2
        Kernel driver in use: ehci_hcd

I have 2 Philips USB webcams attached to this system and controlled by
media-video/motion.  One of the webcams is not functioning, and I'm
supposed to make sure I don't have both of them attached to the USB
1.1 controller.  How can I do that?  I have:

# lsusb
Bus 001 Device 003: ID 04f9:002a Brother Industries, Ltd
Bus 001 Device 001: ID 1d6b:0002
Bus 002 Device 003: ID 0471:0329 Philips
Bus 002 Device 002: ID 0471:0329 Philips
Bus 002 Device 001: ID 1d6b:0001

Is there any way to find out?

- Grant