Lars-Peter Clausen lars@metafoo.de writes:
On 01/05/2015 11:39 PM, Arnd Bergmann wrote:
As discussed on the topic of shmobile DMA today, jz4740 is the only user of the slave_id field in dma_slave_config besides shmobile. This use is really incompatible with the way that other drivers use the dmaengine API, so we should get rid of it.
Do you have a link to that discussion?
This adds a trivial filter function that uses the filter param to pass the dma type, and uses that in both drivers.
In my opinion that's just from bad to worse. Using filter functions isn't that great in the first place. And using them to pass data from the consumer to the DMA provider is just a horrible abuse of the API.
It seems to me the only sane way to use the dmaengine API is in conjunction with DT.