[GIT PULL] omap changes for v2.6.39 merge window

Linus Torvalds torvalds at linux-foundation.org
Fri Apr 1 12:39:38 EDT 2011

On Fri, Apr 1, 2011 at 8:55 AM, Arnd Bergmann <arnd at arndb.de> wrote:
> Well, except that because of point 7, device trees are still inferior to
> having correct and complete information in hardware.

Oh, absolutely.

If you have discoverable hardware, use it.

But by "discoverable hardware" I mean something like PCI config
cycles. IOW, real hardware features. Not some code like

   if (board_signature_is(xyz)) {

that just maps some _other_ hardware knowledge (reading a SoC ID or
something) into an unrelated thing ("I know this SoC has these bits of

So devicetree should never override actual "hardware tells me it
exists here". But you might well have a mapping from SoC ID's to a
compiled-in devicetree thing (this is largely what POWER does, iirc).


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