[PATCH] documentation: iommu: add description of ARM System MMU binding

[Rob Herring]

On 04/05/2013 11:57 AM, Will Deacon wrote:
> Hi Rob,
> 
> On Fri, Apr 05, 2013 at 05:43:06PM +0100, Rob Herring wrote:

[...]

>>> +- compatible    : Should be one of "arm,smmu-v1" or "arm,smmu-v2"
>>> +                  depending on the version of the architecture
>>> +                  implemented.
>>
>> We can keep these, but we should have specific models like arm,smmu-400,
>> etc. as well.
> 
> Ok, if distinctions need to be between MMU-400 and a v1 implementation, then
> we can add those strings later.

No, you want to have specific values in the dtb's up front. If there is
something needed later in the kernel, you don't want to require a dtb
update then. Adding future parts later is fine, but we already know what
blocks we have.

Rob