DT case sensitivity

[Benjamin Herrenschmidt]

On Wed, 2018-08-22 at 19:47 -0500, Rob Herring wrote:
> The default DT string handling in the kernel is node names and
> compatibles are case insensitive and property names are case sensitive
> (Sparc is the the only variation and is opposite). It seems only PPC
> (and perhaps only Power Macs?) needs to support case insensitive
> comparisons. It was probably a mistake to follow PPC for new arches
> and we should have made everything case sensitive from the start. So I
> have a few questions for the DT historians. :)

Open Firmware itself is insensitive.

> What PPC systems are case insensitive? Can we limit that to certain systems?

All PowerMacs at least, the problem is that I don't have DT images or
access to all the historical systems (and yes some people occasionally
still use them) to properly test a change in that area.

> AFAICT, dtc at least (if not anything FDT based) has always been case
> sensitive at least for node and property names. I'm not sure about
> compatible strings?
> 
> Anyone see potential issues with switching all platforms except PPC
> and Sparc to case sensitive comparisons?

Cheers,
Ben.