Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754873AbZCRCCP (ORCPT ); Tue, 17 Mar 2009 22:02:15 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753243AbZCRCB7 (ORCPT ); Tue, 17 Mar 2009 22:01:59 -0400 Received: from fwtops.0.225.230.202.in-addr.arpa ([202.230.225.126]:52317 "EHLO topsms.toshiba-tops.co.jp" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752890AbZCRCB6 (ORCPT ); Tue, 17 Mar 2009 22:01:58 -0400 Date: Wed, 18 Mar 2009 11:01:54 +0900 (JST) Message-Id: <20090318.110154.76582864.nemoto@toshiba-tops.co.jp> To: dan.j.williams@intel.com Cc: linux-mips@linux-mips.org, ralf@linux-mips.org, linux-kernel@vger.kernel.org, haavard.skinnemoen@atmel.com Subject: Re: [PATCH 1/2] dmaengine: TXx9 Soc DMA Controller driver From: Atsushi Nemoto In-Reply-To: References: <20090318.094935.238694196.nemoto@toshiba-tops.co.jp> X-Fingerprint: 6ACA 1623 39BD 9A94 9B1A B746 CA77 FE94 2874 D52F X-Pgp-Public-Key: http://wwwkeys.pgp.net/pks/lookup?op=get&search=0x2874D52F Organization: TOSHIBA Personal Computer System Corporation X-Mailer: Mew version 6.1 on Emacs 22.2 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1077 Lines: 24 On Tue, 17 Mar 2009 18:23:46 -0700, Dan Williams wrote: > Now, back to the issue at hand. Does your driver still need direct > control over chan->chan_id, or can it now rely on the fact that > dma_async_device_register() will fail if a channel is not initialized? > Or, just use some platform_data to identify the channel in the same > manner as atmel-mci? Yes, I still want to control chan->chan_id. The atmel-mci does not select "channel". It just pick the first usable channel of the dma_device specified by platform_data. I suppose dw_dmac is symmetric (it can use any channel for any slave). But TXx9 SoC DMAC channels are hardwired to each peripheral devices. And I want to call Channel-3 of DMAC-0 "dma0chan3" even if Channel-2 was assigned to for public memcpy channel. --- Atsushi Nemoto -- 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/