From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752674AbbCZMMZ (ORCPT ); Thu, 26 Mar 2015 08:12:25 -0400 Received: from arroyo.ext.ti.com ([192.94.94.40]:56767 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752078AbbCZMMV (ORCPT ); Thu, 26 Mar 2015 08:12:21 -0400 Message-ID: <5513F77A.4030005@ti.com> Date: Thu, 26 Mar 2015 14:11:38 +0200 From: Peter Ujfalusi User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 MIME-Version: 1.0 To: Vinod Koul CC: , , , , , , , , , Subject: Re: [PATCH v2 1/7] dmaengine: of_dma: Support for DMA routers 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> In-Reply-To: <20150326105018.GJ32683@intel.com> Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 ++++++++ -- Péter