[PATCH 7/7] OF: set dma_mask for ARM

[Rob Herring]

Grant,

On 11/16/2010 11:24 PM, Grant Likely wrote:
> On Tue, Nov 16, 2010 at 02:33:55PM -0600, Rob Herring wrote:
>> From: Rob Herring<rob.herring at calxeda.com>
>>
>> Various drivers require dma_mask to be valid, so it needs to be setup
>> when doing OF probing on ARM.
>>
>> Signed-off-by: Rob Herring<rob.herring at calxeda.com>
>
> I'll let patches 6&  7 lay fallow for the moment.  I'm not hugely fond
> of the powerpc approach (which microblaze copies), but I haven't had a
> chance to look for a better solution.
>

Looking at this some more, there's a couple of options I see.

Other buses (ISA, PCI, EISA) have a dma_mask in their struct. So perhaps 
platform_device should just have a dma_mask field.

There are several examples of setting dma_mask = &coherent_dma_mask. I'm 
not sure if this is considered correct. At least on ARM, I don't think 
these would need to be different.

Another option would be using bus notifiers to set the dma_mask like 
platform_data. But that doesn't seem like a good long term solution.

Rob