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

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Date:	Fri, 24 Jul 2009 09:35:37 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Dan Williams <dan.j.williams@...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

Dan Williams :
> 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?

Well, in fact the same as dw_dmac: atmel-mci. Adaptation of other
drivers are coming: probably ac97 and spi interfaces.

The patches for adaptation of atmel-mci to at_hdmac are coming...

Best regards,
-- 
Nicolas Ferre

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