From mboxrd@z Thu Jan 1 00:00:00 1970 From: boris.brezillon@free-electrons.com (Boris Brezillon) Date: Tue, 8 Mar 2016 15:46:20 +0100 Subject: [PATCH 5/7] mtd: provide helper to prepare buffers for DMA operations In-Reply-To: <20160308141853.GQ11154@localhost> References: <1457435715-24740-1-git-send-email-boris.brezillon@free-electrons.com> <1457435715-24740-6-git-send-email-boris.brezillon@free-electrons.com> <20160308141853.GQ11154@localhost> Message-ID: <20160308154620.3d64d02b@bbrezillon> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Tue, 8 Mar 2016 19:48:53 +0530 Vinod Koul wrote: > On Tue, Mar 08, 2016 at 12:15:13PM +0100, Boris Brezillon wrote: > > > > +#ifdef CONFIG_HAS_DMA > > Shouldn't this be CONFIG_DMA_ENGINE as you are preparing these descriptors > for DMA transfer? > Nope, scatterlist users are not necessarily using a dmaengine, some IPs are directly embedding a dedicated DMA engine, which has no driver in drivers/dma/. -- Boris Brezillon, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com