On 07-10-20, 11:08, Peter Ujfalusi wrote: > Not really. In DT an event triggered channel can be requested via router > (when this is used) for example: > > dmas = <&inta_l2g a b c>; > a - the input number of the DMA request in l2g > b - edge or level trigger to be selected > c - ASEL number for the channel for coherency > > The l2g router driver then translate this to: > <&main_bcdma 1 0 c> > 1 - Global trigger 0 is used by the DMA > 0 - ignored > c - ASEL number. > > The router needs to send an event which is going to be received by the > channel we have picked up, this event number can only be known when we > do have the channel. > > So the flow in this case: > router converts the dma_spec for the DMA, but it does not yet know what > is the event number it has to use. > The BCDMA driver will pick an available bchan and notes that the > transfers will be triggered by global event 0. > When we have the channel, the core saves the router information and > calls the device_router_config of BCDMA. > In there we call back to the router and give the event number it has to > use to send the trigger for the channel. Ah that is intresting, so you would call router driver foo_set_event() and would send the event number, why not call that API from alloc channel or even xlate? Why do you need new callback? Or did i miss something.. -- ~Vinod
