2011/5/24 Rob Herring [off-list ref]:

I think having "arm,amba-deviceid" is not needed. The current code does
nothing but warn if it doesn't match the h/w value. The drivers already have
a list of id's that they support and the amba bus only matches against the
h/w id value. The only use I can see is overriding a broken h/w value.

We have this usecase in the Ux500. See these patches:
http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=6829/1
http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=6830/1

Alas, it's not yet merged for the old boardfile world usecase, and
causing us problems to drive our hardware already.

Yours,
Linus Walleij