From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vinod Koul Subject: Re: [PATCH v2 1/7] dmaengine: of_dma: Support for DMA routers Date: Thu, 26 Mar 2015 21:02:21 +0530 Message-ID: <20150326153221.GM32683@intel.com> References: <1426080210-841-1-git-send-email-peter.ujfalusi@ti.com> <1426080210-841-2-git-send-email-peter.ujfalusi@ti.com> <20150326105018.GJ32683@intel.com> <5513F77A.4030005@ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <5513F77A.4030005@ti.com> Sender: linux-kernel-owner@vger.kernel.org To: Peter Ujfalusi Cc: tony@atomide.com, linux@arm.linux.org.uk, grant.likely@linaro.org, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, robh+dt@kernel.org, nm@ti.com List-Id: devicetree@vger.kernel.org On Thu, Mar 26, 2015 at 02:11:38PM +0200, Peter Ujfalusi wrote: > On 03/26/2015 12:50 PM, Vinod Koul wrote: > > On Wed, Mar 11, 2015 at 03:23:24PM +0200, Peter Ujfalusi wrote: > >> DMA routers are transparent devices used to mux DMA requests from > >> peripherals to DMA controllers. They are used when the SoC integrates more > >> devices with DMA requests then their controller can handle. > >> DRA7x is one example of such SoC, where the sDMA can hanlde 128 DMA request > >> lines, but in SoC level it has 205 DMA requests. > >> > >> The of_dma_router will be registered as of_dma_controller with special > >> xlate function and additional parameters and the code will translate and > >> requests a DMA channel from the real DMA controller. > >> This way the router can be transparent for the system while remaining generic > >> enough to be used in different environments. > >> > > Looks fine, was expecting a Documentation updates as well, but that can come > > as follow up patch too > > I have added the DT binding document since this series adds support for > routers for platforms booting with DT: > > Documentation/devicetree/bindings/dma/dma.txt | 28 ++++++++ I meant the update to Documnetation/dmanegine/ for routers :) -- ~Vinod