> From: linux-usb-ow...@vger.kernel.org 
> [mailto:linux-usb-ow...@vger.kernel.org] On Behalf Of David Mosberger
> Sent: Thursday, January 30, 2014 4:35 PM
> 
> We have a need to graft a USB Host controller onto a SPI bus (never
> mind the wisdom of doing that, we have little
> choice in this particular instance).
> 
> The Cypress CY7C67300 would fit the bill and has a Linux driver, but
> is probably too complex and definitely
> too expensive for our needs.
> 
> The Maxim MAX3421E is the other option, but it has no Linux driver.
> The chip basically implements OHCI over SPI
> rather than PCI.  Anybody know of any particular reason why there is
> no Linux driver?  Has anyone already written or
> attempted to write an OHCI-over-SPI driver for MAX3421E?

ISTR that the MAX3421E does not in fact have an OHCI register interface;
I believe it's some proprietary thing. If I'm right, that might help
explain why there's no Linux driver for it.

-- 
Paul

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