UIO / of_genirq driver
Wolfram Sang
w.sang at pengutronix.de
Thu Jan 28 21:45:45 EST 2010
John,
> I came across this thread/patchset from around June last year:
>
> http://lists.ozlabs.org/pipermail/linuxppc-dev/2009-June/073086.html
>
> where Wolfgang proposed a generic OF-driven UIO driver. The
Wolfram, please ;)
> discussion seemed to stall after Grant Likely indicated he didn't like
> the use of a linux-specific compatible binding in the device tree
> (compatible="generic-uio").
I agree with him on that.
> I guess I have a couple of questions:
>
> * did this patchset go anywhere? I've been using it here the last
> few days and it works great.
The idea was to create a mechanism to instantiate bindings at runtime, similar
to new_id for PCI/PCMCIA, e.g.:
$ echo "commodore,c64" > /sys/bus/of_platform/drivers/of_uio_genirq/new_compatible
so we don't have to maintain an ever growing list of hardcoded
compatible-properties for those UIO-devices.
> * Is there a better way to handle the OF bindings for this sort of thing?
Run-time instantiation might help in a couple of other cases; still, in the
progress of unifying/extending the OF-support, it was discussed if it was
possible to get rid of of_platform entirely. It looks like a very challenging
task, but seems to be favoured designwise (at least I do).
> However, the device-tree guys complain whenever anyone tries to encode
> anything non-hardware related into the DTS itself.
Well, if I get a device tree including special properties for Linux and BSD and
whatever may follow, that could get quite confusing :)
> I guess I'd like to just open up a discussion, see if there's been any
> progress towards a general solution.
I decided to wait for the outcome of the of_platform-removal-idea. Though, I
have to admit that in the last weeks I haven't followed of-related things due
to other commitments.
Regards,
Wolfram
--
Pengutronix e.K. | Wolfram Sang |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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