linux-kernel - Re: [PATCH] dmaengine: at_hdmac: add DMA slave transfers

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Message-ID: <e9c3a7c20907231013k3d5e8c89w1069e8509539438f@mail.gmail.com>
Date:	Thu, 23 Jul 2009 10:13:31 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
Cc:	maciej.sosnowski@...el.com,
	linux-arm-kernel@...ts.arm.linux.org.uk, patrice.vilchez@...el.com,
	linux-kernel@...r.kernel.org, haavard.skinnemoen@...el.com
Subject: Re: [PATCH] dmaengine: at_hdmac: add DMA slave transfers

On Wed, Jul 22, 2009 at 11:04 AM, Nicolas Ferre<nicolas.ferre@...el.com> wrote:
> This patch for at_hdmac adds the slave transfers capability to the Atmel DMA
> controller available on some AT91 SOCs. This allow peripheral to memory and
> memory to peripheral transfers with hardware handshaking.
>
> Slave structure for controller specific information is passed through channel
> private data. This at_dma_slave structure is defined in at_hdmac.h header file
> and relative hardware definition are moved to this file from at_hdmac_regs.h.
> Doing this we allow the channel configuration from platform definition code.
>
> This work is intensively based on dw_dmac and several slave implementations.
>
> Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
> ---

Seems straightforward and self contained, applied.  Just curious which
drivers will take advantage of this slave capability?  As it stands I
do not see any in-tree users of at_hdmac beyond dmatest?

Thanks,
Dan
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