Messages in this thread | | | Date | Tue, 12 Feb 2008 10:30:04 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: multiple drivers, single device (was Re: Announce: Linux-next (Or Andrew's dream :-))) |
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On Tue, 12 Feb 2008, Jeff Garzik wrote:
> Greg KH wrote: > > The work I'm doing here is for stupid PCI firmware engineers, who have > > created devices that are different things, all bound up under the same > > PCI device. I'm thinking of watchdog timers and random number > > generator and i2c controller on the same PCI device, or even the more > > basic, frame buffer and DRM access to the same PCI video device. > > Yes, that has a known solution: have your driver register i2c, rng, watchdog, > etc. functions. > > Works just fine inside today's infrastructure, no changes needed.
Indeed. If you have a multi-function device that shows up as a single PCI function, just make it have its own "private bus", and make it show up as a "devices within a device".
Create the fake PCI subdevices that have no "real" counterpart, except as parts of the stupid device that couldn't be bothered to be seen as multiple _real_ functions.
That not only solves the infrastructure issues, it's actually The Truth with capital letters. It is, after all, how the device actually works internally.
Linus
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