Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [PATCH v2 00/16] ARM: support for ICP DAS LP-8x4x (with dts) | Date | Wed, 18 Dec 2013 21:50:38 +0100 |
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On Monday 16 December 2013, Sergei Ianovich wrote: > On Mon, 2013-12-16 at 18:56 +0100, Arnd Bergmann wrote: > > Ok, I see. This sounds like some of the other platforms we have with > > external memory buses. If there is a chance that Linux ever has to > > program the per-CS settings into the bus controller, I would suggest > > to represent that as well as a separate node, like this > > This is a platform-specific bus (PXA27x). Should it go into pxa27x.dtsi > rather than machine dts?
Yes, that was the idea.
> > In case there is a driver for the extbus node, I would not make it > > "simple-bus" but instead add a separate compatible string to match > > the driver, and let that driver call of_platform_populate > > to probe the children after the bus is set up. > > There seems to be none at the moment. However, some machines need to > setup these partitions as a part of their initialization. So complete > migration to DT will require this driver. > > In LP-8x4x case everything is setup by the bootloader. So "simple-bus" > works for me.
Hmm, this is a bit tricky then. I think it would be best to not use "simple-bus" then, to allow migrating the other platforms later, but that will be a little more work. Maybe you can register a trivial driver in the platform code that only calls of_platform_populate on the device for now?
Arnd
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