DMA range support on BCM283x

[Mark Brown]

On Fri, Mar 08, 2024 at 03:06:01PM +0000, Dave Stevenson wrote:

> Assuming I'm correct with the above, the question is how to implement
> a solution that corrects the behaviour whilst still supporting the old
> DT, and preferably isn't spread far and wide through the code.
> Worst case is to require all DMA users and the DMA controller to look
> for the dma-ranges property, observe the range isn't present, and drop
> back to the current behaviour.
> Slightly nicer is to use the knowledge that "ranges" and "dma-ranges"
> in this case should be identical, so have the DMA controller driver
> attempt a lookup with "ranges" if "dma-ranges" fails.

Either of those solutions seems fine to me.
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