From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757396AbbA2NKr (ORCPT ); Thu, 29 Jan 2015 08:10:47 -0500 Received: from mout.kundenserver.de ([212.227.17.13]:65409 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754656AbbA2NKp (ORCPT ); Thu, 29 Jan 2015 08:10:45 -0500 From: Arnd Bergmann To: Zubair Lutfullah Kakakhel Cc: vinod.koul@intel.com, dan.j.williams@intel.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org Subject: Re: [PATCH 1/2] dt: dma: Add DT binding document for jz4780-dma Date: Thu, 29 Jan 2015 14:10:36 +0100 Message-ID: <2670922.EEM3IMjO9B@wuerfel> User-Agent: KMail/4.11.5 (Linux/3.16.0-10-generic; KDE/4.11.5; x86_64; ; ) In-Reply-To: <1422533980-42761-2-git-send-email-Zubair.Kakakhel@imgtec.com> References: <1422533980-42761-1-git-send-email-Zubair.Kakakhel@imgtec.com> <1422533980-42761-2-git-send-email-Zubair.Kakakhel@imgtec.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" X-Provags-ID: V03:K0:oQtSW+NVFM286WR+47GRI7rq2Ybf43wbhxviREUfIiY3kVGgXuN Z/PvBlfmRhmQhz1Xo0HIO6oX+uPL8R28JF8eHeB3z97eLJXtpu0E0LzVrpJO2+mi/OijzRt CuOvhbMUBN1OwdychHR5eBy1XK955rLyK/wdmJM+mEAhbNQp8GdY1oksODqoASFJu9b4o4m 7sVugLi7A1w3PatoXAtsA== X-UI-Out-Filterresults: notjunk:1; Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thursday 29 January 2015 12:19:38 Zubair Lutfullah Kakakhel wrote: > > +1. Transmit request type: The DMA request type for transfers to the device on > + the allocated channel, as defined in the SoC documentation. If set to 0, > + transfers to the device will not be allowed on the channel. > + > +2. Receive request type: The DMA request type for transfers from the device on > + the allocated channel, as defined in the SoC documentation. If set to 0, > + transfers from the device will not be allowed on the channel. It's fairly unusual to have separate fields for these two, most other driver just use one. What would be a use-case for passing both? Arnd