> > diff --git a/Documentation/powerpc/dts-bindings/uio-generic.txt
> > b/Documentation/powerpc/dts-bindings/uio-generic.txt
> > new file mode 100644
> > index 0000000..8ad9861
> > --- /dev/null
> > +++ b/Documentation/powerpc/dts-bindings/uio-generic.txt
> > @@ -0,0 +1,16 @@
> > +UIO for custom devices
> > +
> > +A device which will be mapped using the UIO subsystem.
> > +
> > +Properties:
> > + - compatible : should contain the specific model used, followed by
> > + "generic-uio".
> > + - reg : address range(s) of the device (up to MAX_UIO_MAPS)
> > + - interrupts : interrupt of the device
> > +
> > +Example:
> > + c64f...@0 {
> > + compatible = "ptx,c64fpga001", "generic-uio";
> > + reg = <0x0 0x10000>;
> > + interrupts = <0 0 3>;
> > + };
>
> Hmmm, I'm not happy about this. The device tree describes the
> hardware, not the way Linux uses the hardware. UIO definitely falls
> into the category of Linux implementation detail.Yes, I am aware of that. I just started with the mechanisms which are available today and hoped we could find some compatible-value which will suit all needs. > This should be approached from the other way around. Either the > generic-uio of_platform driver should contain an explicit list of > devices to be handled by UIO, Well, that could lead to a quite huge match_table over time. > or the OF infrastructure should be modified to allow things like force > binding of_devices to of_drivers at runtime. That is an interesting idea. I could imagine something like a 'new_compatible" entry in the sysfs-section of the driver similar to 'new_id' for PCI. After writing a new compatible-string into it, matching will triggered again with the new entry added. That could (should?) also be placed at the of-core-level. Or did you have something else in mind? Regards, Wolfram -- Pengutronix e.K. | Wolfram Sang | Industrial Linux Solutions | http://www.pengutronix.de/ |
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