Messages in this thread | | | From | Måns Rullgård <> | Subject | Re: [PATCH, RFC] MIPS: jz4740: use dma filter function | Date | Tue, 06 Jan 2015 12:47:00 +0000 |
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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.
-- Måns Rullgård mans@mansr.com
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