Hi Arnd, 2015-10-08 17:43 GMT+02:00 Arnd Bergmann <[email protected]>: > On Thursday 08 October 2015 17:20:09 M'boumba Cedric Madianga wrote: >> +Each dmas request consists of 5 cells: >> +1. A phandle pointing to the STM32 DMA controller >> +2. The channel id >> +3. The request line number >> +4. A 32bit mask specifying the DMA channel configuration >> > > It's fairly unusual to encode the channel id here, rather than > letting the driver pick one. Is that actually required here? Yes it is required as in STM32 platform the channel/request DMA mapping is done by hardware lines. So, if one client wants to use DMA, he has to choose the correct channel/request values according to the DMA mapping of his STM32 platform.
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