On Wed, Jan 22, 2014 at 11:14:09AM -0700, Jason Gunthorpe wrote: > On Wed, Jan 22, 2014 at 03:01:01PM -0300, Ezequiel Garcia wrote: > > On Wed, Jan 22, 2014 at 01:21:36PM -0300, Ezequiel Garcia wrote: > > > > I don't see a good way out that would preserve backwards compatibility, > > > > other than hardcoding the physical address in the driver, which seems > > > > just as bad as breaking compatibility. That said, it is always the > > > > same constant (0xf1000000 + 0x20000 + 0x0108) on Dove, Kirkwood and > > > > Orion5x (not on mv78xx0, but that doesn't use the wdt), so hardcoding > > > > a fallback would technically work, but we should print a fat warning at > > > > boot time if we actually fall back to that. > > > > > > > > > > Yes, I was thinking just about this. Namely: > > > > > [..] > > > > How about something like this? > > I liked Arnd's idea to use an offset from the first register. With the > mbus driver we can now actually change the 0xF1.. prefix via the DT. > Good idea. Maybe extracting the base address from the timer control register: wdt_reg & 0xff000000 ? -- Ezequiel García, Free Electrons Embedded Linux, Kernel and Android Engineering http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
