[PATCH RESEND 3/5] ARM: brcmstb: add misc. DT bindings for brcm, brcmstb

[arnd@arndb.de (Arnd Bergmann)]

On Saturday 23 November 2013, Marc C wrote:
> Hello Arnd,
> 
> > Normally the "compatible" string identifies the register layout and
> > you keep the offsets in the device driver. Do you have strong reasons to do it
> > differently here?
> 
> The register block that contains the reset registers also contains other
> ?general purpose? registers, which can potentially scoot the positions
> of both ?sw-master-reset? and ?reset-source-enable?. Although we do
> stress to the H/W designers that consistency between chips is important,
> and that relative offsets of those registers should remain the same
> between chip revisions, there is no guarantee that this will happen.
> 
> Now, rather than handling N revisions of the ?sun-top-ctrl? register
> block at both the boot loader and kernel levels (N could get very large
> as we continue to port support for more chips), I feel that a more
> flexible solution would be to rely on the self-describing nature of the DT.

Ok, I see. I guess it's not even a uniform layout within the registers
then, right? Otherwise you could reference the number of the reset
register through the reset-api, but it gets kind of ugly when passing
the wrong value for a reset line touches a completely unrelated register
rather than "just" resetting the wrong device.

	Arnd