Bug#785707: Add USB support for APM Mustang

[Ian Campbell <ijc@hellion.org.uk>]

On Tue, 2015-05-19 at 20:02 +0100, Ian Campbell wrote:
> On Tue, 2015-05-19 at 12:52 +0100, Steve McIntyre wrote:
> > +CONFIG_USB_XHCI_PLATFORM=y
> 
> This guy seems to match on:
> static const struct of_device_id usb_xhci_of_match[] = {
>         { .compatible = "generic-xhci" },
>         { .compatible = "xhci-platform" },
>         { .compatible = "marvell,armada-375-xhci"},
>         { .compatible = "marvell,armada-380-xhci"},
>         { .compatible = "renesas,xhci-r8a7790"},
>         { .compatible = "renesas,xhci-r8a7791"},
>         { },
> 
> But I don't see any of those in the mustang DTBs even in the mainline
> kernel.

But I do see them in the latest APM UEFI firmware, so I suppose this
will only work with that and not with e.g. uboot.

Not a blocker per se, I'm not even sure if u-boot can boot from usb
anyhow.