[PATCH 0/3]: Sparc OF I2C support.

[David Miller]

From: "Grant Likely" <grant.likely at secretlab.ca>
Date: Thu, 21 Aug 2008 17:14:57 -0600

> On Thu, Aug 21, 2008 at 3:35 PM, Scott Wood <scottwood at freescale.com> wrote:
> > David Miller wrote:
> >>>
> >>> On Thu, Aug 21, 2008 at 12:10:12AM -0700, David Miller wrote:
> >> If you guys created this format in your compressed openfirmware
> >> trees, is it possible for you to "fix" it to match what Sparc
> >> systems following the proper bindings do?
> >
> > Possibly, though it'll cause some pain when old trees are used with a kernel
> > that expects the new binding.
> 
> Ugh, more like loads of pain.  There are deployed platforms using the
> embedded 'invented' bindings.  I don't think it is an option to break
> compatibility with older trees.  If there is some backwards
> compatibility code then I'm all for migrating to the same binding as
> Sparc and PowerMac

You could even put the detection and reg property fixups in the device
tree expander.  This way generic code in drivers/of/of_i2c.c doesn't
need to know about this huge mistake.