Re: [PATCH V3 1/2] of: Add generic device tree DMA helpers

On 14 June 2012 04:02, Jon Hunter [off-list ref] wrote:

On 06/08/2012 07:04 PM, Arnd Bergmann wrote:

quoted

As I said previously, I think just encoding the direction but not
the client specific ID (meaning we would have to disambiguate
the more complex cases that Stephen mentioned using a dma-names
property) would be the best because it keeps the common case simple,
but I could live with other things going in there too.

Ok, so you are saying that there are some DMA controllers where there is
no channel/request ID and only a direction is needed? So an even simpler
case than what I had imagined.

I am curious to know which DMA controllers don't need any client ID ?
unless it is Mem->Mem (for which even specifying direction is
meaningless).
Rather, I think specifying direction is even lesser useful, since
usually the client's ID imply the (bi/uni)direction.