From mboxrd@z Thu Jan 1 00:00:00 1970 From: Grant Likely Subject: Re: [PATCH 0/5] ARM: PrimeCell DMA patches v4 Date: Thu, 8 Apr 2010 00:12:57 -0600 Message-ID: References: <1269905728-5452-1-git-send-email-linus.walleij@stericsson.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Cc: Russell King , "spi-devel-general@lists.sourceforge.net" , "linux-mmc@vger.kernel.org" , STEricsson_nomadik_linux , Dan Williams , "linux-arm-kernel@lists.infradead.org" To: Linus WALLEIJ Return-path: In-Reply-To: Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-spi.vger.kernel.org On Tue, Mar 30, 2010 at 3:57 AM, Linus WALLEIJ wrote: > [Self] > >> This is a fourth iteration of the PrimeCell DMA API on top of the >> generic DMA devices (sibling to the DMA engine). It's based on >> the suggestion from Russell to try and define a specific extension >> subset for DMA devices. > > Russell & Grant can you give some hint on the direction you > see for this patch set? > > The problem we're facing is that next I will start adding DMA > support for the U8500 and the MMCI derivate found in that platform > doesn't *have* a PIO IRQ, which means the system cannot even > boot without some solid DMA framework in place. (It is currently > unbootable from the released kernels.) > > So unless there is some outstanding issue with this approach > we pretty much need this now to keep working on mainlining > the U8500. > > I would very much like to have the DMA patches for PrimeCell > support pushed through Dan's tree, but that requires your ACKs > of course, and it will inevitably collide with other PrimeCell > patches for the next merge window (many submitted by myself > admittedly). > > I can feed all the PrimeCell stuff to Dan if all agree that this > is a good approach. Another approach is to apply the latest > patches from Dan's tree to ARM and SPI alike and then feed > the PrimeCell stuff through the ARM tree. I have no objections to the SPI driver getting merged via Dan's tree. g.