linux-kernel - Re: [PATCH 07/13] dmaengine: introduce dma_request

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Message-ID: <e9c3a7c20901301513v74953d7aj8533d05cddfa510@mail.gmail.com>
Date:	Fri, 30 Jan 2009 16:13:12 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Atsushi Nemoto <anemo@....ocn.ne.jp>
Cc:	g.liakhovetski@....de, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, maciej.sosnowski@...el.com,
	hskinnemoen@...el.com, nicolas.ferre@...el.com
Subject: Re: [PATCH 07/13] dmaengine: introduce dma_request_channel and 
	private channels

On Fri, Jan 30, 2009 at 10:03 AM, Atsushi Nemoto <anemo@....ocn.ne.jp> 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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