On Tue, Apr 02, 2013 at 01:51:51PM +0200, Pavel Machek wrote: > On Mon 2013-04-01 19:42:12, Guenter Roeck wrote: > > On Mon, Apr 01, 2013 at 05:40:08PM +0200, Pavel Machek wrote: > > > On Mon 2013-04-01 16:23:36, Pavel Machek wrote: > > > > Hi! > > > > > > > > I'd like to get uio device tree bindings to work -- with recent FPGA > > > > parts it will be important. Latest version I see is > > > > > > > > https://lists.ozlabs.org/pipermail/linuxppc-dev/2009-June/073087.html > > > > > > > > ... Is there anything newer? > > > > > > > > I red the discussion, and main problem seems to be the "tell kernel to > > > > drive this device tree device", right? > > > > > Problem seems to be the notion that the proposed devicetree entry would not > > describe the hardware, but its use. Not really sure I understand the > > problem, > > as I would see the hardware description to be "A hardware device which is > > compatible to and managed by the generic-uio driver". I would argue that > > this _is_ a hardware description (if not, what is ?), but I am not the one > > to make the call. > > Well... one could argue that having "generic-uio" in board's device > tree _is_ wrong, but having driver that binds to "generic-uio" is > not. Hmm? > You mean like "ata-generic" ?
> Or maybe we can do some magic with module parameter. That should be > enough for expected use. > I don't think that would make a difference. I mean, just take ns16550 as another example. No one has problems declaring some block of hardware addresses to be compatible with "ns16550", even though it can be anything including a memory block on one of the FPGAs or ASICs we are talking about here, it can be anything but a NS16550, and many of the actual "compatible" strings are not defined anythere either. So there is no problem with "ata-generic" and "ns16550", and no one cares if "fsl,mpc8349emitx-pata" or "xlnx,xps-uart16550-2.00.b" is defined or not, but "generic-uio" together with "ptx,c64fpga001" is unacceptable. I think it has more to do with the uio driver not being an actual driver, but the kernel part of a user-space driver, though that is just a wild guess. Guenter -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/