Re: Host Controller Driver Question

[Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>]

On Thu, 25 Oct 2007, Steve Addison wrote:

> I need to add a USB host controller chip to an embedded product that's 
> running a kernel 2.4.18
> When selecting a host controller chip, I'm wondering about drivers. Are 
> pretty much all OHCI chips
> handled by the generic OHCI drivers?

Lots of them are.  I would hesitate to say that all of them are.

> Also, I noticed that in the 2.6 kernel driver source, it looks like 
> there are quite a few drivers for
> specific host chips (linux\drivers\usb\host). Are these chips that 
> differ from the OHCI/UHCI "standards"
> enough that they need special drivers?

No.  They differ from the "standard" in that they use a
platform-specific interface instead of PCI.  Otherwise they are pretty
much the same as any other OHCI controller.

> Or would any chip need a specific 
> driver?

You probably can answer this question yourself.

Alan Stern


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