On Tue, 17 Mar 2009 18:23:46 -0700, Dan Williams <dan.j.williams@xxxxxxxxx> wrote: > Now, back to the issue at hand. Does your driver still need direct > control over chan->chan_id, or can it now rely on the fact that > dma_async_device_register() will fail if a channel is not initialized? > Or, just use some platform_data to identify the channel in the same > manner as atmel-mci? Yes, I still want to control chan->chan_id. The atmel-mci does not select "channel". It just pick the first usable channel of the dma_device specified by platform_data. I suppose dw_dmac is symmetric (it can use any channel for any slave). But TXx9 SoC DMAC channels are hardwired to each peripheral devices. And I want to call Channel-3 of DMAC-0 "dma0chan3" even if Channel-2 was assigned to for public memcpy channel. --- Atsushi Nemoto
