Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757175AbaJINjm (ORCPT ); Thu, 9 Oct 2014 09:39:42 -0400 Received: from mail-lb0-f177.google.com ([209.85.217.177]:35340 "EHLO mail-lb0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751834AbaJINjd (ORCPT ); Thu, 9 Oct 2014 09:39:33 -0400 MIME-Version: 1.0 In-Reply-To: <20141007145226.GA17925@lukather> References: <1411746035-15882-1-git-send-email-maxime.ripard@free-electrons.com> <1411746035-15882-2-git-send-email-maxime.ripard@free-electrons.com> <7725507.nuHj4C7OxF@avalon> <5433D9AF.8020508@atmel.com> <20141007145226.GA17925@lukather> Date: Thu, 9 Oct 2014 15:39:30 +0200 X-Google-Sender-Auth: -OBYf3ABmii4YROm0Rxqqp7PUDA Message-ID: Subject: Re: [PATCH v2 2/2] Documentation: dmaengine: Add a documentation for the dma controller API From: Geert Uytterhoeven To: Maxime Ripard Cc: Russell King , Nicolas Ferre , Vinod Koul , Laurent Pinchart , Dan Williams , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , dmaengine@vger.kernel.org, Arnd Bergmann , =?UTF-8?Q?Antoine_T=C3=A9nart?= , Thomas Petazzoni , Alexandre Belloni , Boris Brezillon , Matt Porter , Gregory Clement Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Oct 7, 2014 at 4:52 PM, Maxime Ripard wrote: >> >> +These various types will also affect how the source and destination >> >> +addresses change over time, as DMA_SLAVE transfers will usually have >> >> +one of the addresses that will increment, while the other will not, >> >> +DMA_CYCLIC will have one address that will loop, while the other, will >> > >> > s/the other,/the other/ >> > >> >> +not change, etc. >> >> This is a little bit vague in my opinion. And usually, it is pretty >> implementation specific. > > Which is why we can't really be more precise. If you have any other > wording coming to your mind, I'm all for it :) Perhaps: Addresses pointing to RAM are typically incremented (or decremented) after each transfer. In case of a ring buffer, they may loop (DMA_CYCLIC). Addresses pointing to a device's register (e.g. a FIFO) are typically fixed. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds -- 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/