Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752560AbbF1On6 (ORCPT ); Sun, 28 Jun 2015 10:43:58 -0400 Received: from mga01.intel.com ([192.55.52.88]:58566 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752143AbbF1Onw (ORCPT ); Sun, 28 Jun 2015 10:43:52 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.13,693,1427785200"; d="scan'208";a="754648770" Date: Sun, 28 Jun 2015 20:15:29 +0530 From: Vinod Koul To: Nicolae Rosia Cc: Appana Durga Kedareswara Rao , "linux-kernel@vger.kernel.org" , Srikanth Thokala , Michal Simek , Soren Brinkmann , Anirudha Sarangi , "dmaengine@vger.kernel.org" , Punnaiah Choudary Kalluri , "dan.j.williams@intel.com" , "linux-arm-kernel@lists.infradead.org" Subject: Re: [PATCH v7] dma: Add Xilinx AXI Direct Memory Access Engine driver support Message-ID: <20150628144529.GZ19530@localhost> References: <1433831736-18253-1-git-send-email-appanad@xilinx.com> <20150622104932.GC19530@localhost> <20150627144054.GW19530@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 975 Lines: 22 On Sat, Jun 27, 2015 at 05:44:38PM +0300, Nicolae Rosia wrote: > On Sat, Jun 27, 2015 at 5:40 PM, Vinod Koul wrote: > [...] > >> Please let me know if you are not clear. > > No sorry am not... > > > > I asked how the device address in configured. For both MM2S S2MM you are > > using sg for memory address, where are you getting device adress, are you > > assuming/hardcoding or getting somehow, if so how? > As the name says, one end is memory (MM) and the other end is an AXI4 > Stream Bus (S) which has no concept of memory address. > So yes, it is hardcoded at design time. So where does the data go at the end of stream bus, who configures that? Shouldnt all this be at least documented... -- ~Vinod -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/