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

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Message-ID: <20130426094430.GH14496@n2100.arm.linux.org.uk>
Date:	Fri, 26 Apr 2013 10:44:30 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Vinod Koul <vinod.koul@...el.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	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 Fri, Apr 26, 2013 at 11:39:20AM +0200, Arnd Bergmann wrote:
> 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?

Yes.
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