On Thu, Sep 27, 2018 at 12:20 AM Al Cooper [off-list ref] wrote:

This driver enables USB OHCI on Broadcom ARM and MIPS STB SoCs.
The drivers depend on a matching "brcm,brcmstb-usb-phy"
Broadcom STB USB Phy driver.

The standard platform driver can't be used because of differences
in PHY and Clock handling. The standard PHY handling in hcd.c will
do a phy_exit/phy_init on suspend/resume and this will end up
shutting down the PHYs to the point that the host controller
registers are no longer accessible and will cause suspend to crash.
The clocks specified in device tree for these drivers are not
available in mainline so instead of returning EPROBE_DEFER when
the specified clock is not found and eventually failing probe,
the clock pointer is set to NULL which disables all clock handling.

Both of these sound like fairly minor differences, I wonder if the
generic code could be adapted to have a special case for these
rather than duplicating it.

        Arnd