On Wed, Mar 30, 2011 at 03:09:04PM +0200, Arnd Bergmann wrote: > I believe the one thing we really want from this driver is the bus > scan code, which is not present in the amba bus implementation, > as far as I can tell. Today, the amba bus does very little beyond > what the platform bus does, in particular you still need to > register every single device from board specific code. > > When the proposed axi_scan() function gets turned into an > amba_bus_register() function, a board file can call that to > add all devices on the bus without listing them individually > and calling amba_device_register() for each one. > > Basically everything else is already there in the amba bus, > no need to do it again. The reason we don't do automatic scanning (which we could on the various ARM platforms) is because of the platform data necessary to make some of the primecell drivers work. Unfortunately, these buses are not as simple as PCI, where a device typically sits on its own card and is totally self-contained. With primecell stuff, there's normally some interdependencies between the various primecells. That doesn't stop there being an automatic enumeration layer, but such a layer would need some way of attaching platform specific data to specific amba devices. _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
