Re: [PATCH 07/13] dmaengine: introduce dma_request_channel and private channels

[Dan Williams]

On Fri, Jan 30, 2009 at 10:03 AM, Atsushi Nemoto <anemo@xxxxxxxxxxxxx> wrote:
> 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.

> 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.

--
Dan
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