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

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Date:	Mon, 04 Aug 2014 09:16:59 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
CC:	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	dmaengine@...r.kernel.org, Russell King <linux@....linux.org.uk>,
	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>,
	laurent.pinchart@...asonboard.com, ludovic.desroches@...el.com,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>
Subject: Re: [PATCH] Documentation: dmaengine: Add a documentation for the
 dma controller API

On 08/02/2014 05:13 PM, Maxime Ripard wrote:
> On Fri, Aug 01, 2014 at 08:09:17PM +0200, Lars-Peter Clausen wrote:
>> On 08/01/2014 07:15 PM, Vinod Koul wrote:
>>> On Fri, Aug 01, 2014 at 10:57:07AM +0200, Maxime Ripard wrote:
>>>> On Fri, Aug 01, 2014 at 10:00:10AM +0200, Lars-Peter Clausen wrote:
>>>>> On 07/31/2014 07:37 PM, Maxime Ripard wrote:
>>>>>> On Thu, Jul 31, 2014 at 06:54:11PM +0200, Lars-Peter Clausen wrote:
>>>>>>> On 07/31/2014 06:13 PM, Maxime Ripard wrote:
>>>>>>> [...]
>>>>>>>>  From what you're saying, and judging from the drivers that already
>>>>>>>> implement it, can't it be moved directly to the framework itself ?
>>>>>>>>
>>>>>>>
>>>>>>> What exactly do you mean by moving it directly to the framework? The
>>>>>>> slave_caps API is part of the DMAengine framework.
>>>>>>
>>>>>> Not its implementation, which is defined by each and every driver,
>>>>>> while the behaviour of device_slave_caps is rather generic.
>>>>>>
>>>>>
>>>>> Do you mean something like adding a dma_slave_caps struct field to
>>>>> the DMA channel that gets initialized when the channel is created
>>>>> and then remove the callback? That makes some sense.
>>>>
>>>> I was rather thinking into something like:
>>>>    - Splitting device_control into independant functions
>>> I like this part :)
>>
>> I started working on this a while ago by splitting out the
>> slave_config functionality into its own callback. Haven't managed to
>> finalize it since it wasn't really top priority.
>
> He, I've done the same yesterday... Do you plan on submitting it soon,
> or should I keep going?

The plan was to submit it eventually. But if you already did it as well, go 
for it.

- Lars

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