From: Arnd Bergmann Subject: Re: [PATCH 6/9] crypto: ux500/cryp - Set DMA configuration though dma_slave_config() Date: Fri, 26 Apr 2013 11:39:20 +0200 Message-ID: <1457204.tIrKjcEogd@wuerfel> References: <1366280825-31136-1-git-send-email-lee.jones@linaro.org> <20130426081646.GD24632@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Cc: Vinod Koul , Linus Walleij , Russell King - ARM Linux , Linus WALLEIJ , "linux-kernel@vger.kernel.org" , magnus.p.persson@stericsson.com, Herbert Xu , "linux-crypto@vger.kernel.org" , Andreas Westin , Lee Jones , "David S. Miller" To: linux-arm-kernel@lists.infradead.org Return-path: Received: from moutng.kundenserver.de ([212.227.126.186]:51462 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758214Ab3DZJjR (ORCPT ); Fri, 26 Apr 2013 05:39:17 -0400 In-Reply-To: <20130426081646.GD24632@intel.com> Sender: linux-crypto-owner@vger.kernel.org List-ID: 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