On Fri, 30 Jan 2009, Dan Williams wrote:

On Fri, Jan 30, 2009 at 10:03 AM, Atsushi Nemoto [off-list ref] wrote:

quoted

I'm writing a new dma driver.  My DMAC has multiple channels and only
one channel is capable for generic memcpy and other channels have
fixed role.

Does new framework allow dma driver make only one channel public?

Yes, if the driver registers a dma_device for each channel.

quoted

Or should I register two dma_device for DMA_MEMCPY and DMA_SLAVE?
Could you give me some advice?

Register multiple dma_devices, the public one with a DMA_MEMCPY, and
the fixed role devices with DMA_PRIVATE, DMA_MEMCPY, and DMA_SLAVE
capabilities.

DMA_PRIVATE ensures that a channel is never considered for public consumption.

Maybe just two dma-devices would suffice: one with the public memcpy 
channel, and one with the rest private slave channels?

Thanks
Guennadi
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Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer