linux-kernel - Re: [PATCH v2 2/2] Documentation: dmaengine: Add a documentation for the dma controller API

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Date:	Thu, 9 Oct 2014 15:39:30 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	Russell King <linux@....linux.org.uk>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Dan Williams <dan.j.williams@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, dmaengine@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>,
	Antoine Ténart <antoine@...e-electrons.com>,
	Thomas Petazzoni <thomas@...e-electrons.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Boris Brezillon <boris@...e-electrons.com>,
	Matt Porter <matt.porter@...aro.org>,
	Gregory Clement <gregory.clement@...e-electrons.com>
Subject: Re: [PATCH v2 2/2] Documentation: dmaengine: Add a documentation for
 the dma controller API

On Tue, Oct 7, 2014 at 4:52 PM, Maxime Ripard
<maxime.ripard@...e-electrons.com> 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@...ux-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
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