linux-kernel - Re: [PATCH 6/9] crypto: ux500/cryp - Set DMA configuration though dma_slave

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Date:	Fri, 26 Apr 2013 11:39:20 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Vinod Koul <vinod.koul@...el.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Linus WALLEIJ <linus.walleij@...ricsson.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	magnus.p.persson@...ricsson.com,
	Herbert Xu <herbert@...dor.hengli.com.au>,
	"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
	Andreas Westin <andreas.westin@...ricsson.com>,
	Lee Jones <lee.jones@...aro.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 6/9] crypto: ux500/cryp - Set DMA configuration though dma_slave_config()

On Friday 26 April 2013 13:46:46 Vinod Koul wrote:
> 
> The mapping & unmapping of dma buffer (memcpy and memory buffer in this txn) is
> required to be performed by the client driver. The dmanegine or dmaengine driver
> will not do that for you...

I've been wondering about this part: since we need to pass the 'struct device' of
the dma engine (rather than the slave) into dma_map_single, what is the official
way to do that? Should the slave driver just rely on dma_chan->device->dev to
work correctly for the purpose of dma-mapping.h interfaces?

	Arnd
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