Bug#785707: Add USB support for APM Mustang

[Ian Campbell <ijc@debian.org>]

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. AFAIK the USB on this platform isn't PCI based or anything like
that.

Are additional DTB patches also needed? (Or more worryingly, custom
firmware...)

Ian.