[alsa-devel] [PATCH 1/2] ASoC: samsung: s3c24{xx, 12}-i2s: port to use generic dmaengine API

[Lars-Peter Clausen]

On 05/20/2014 11:25 AM, Vasily Khoruzhick wrote:
> On Mon, May 19, 2014 at 11:34 PM, Lars-Peter Clausen <lars at metafoo.de> wrote:
>> On 05/19/2014 10:18 PM, Vasily Khoruzhick wrote:
>>>
>>> On Mon, May 19, 2014 at 8:11 PM, Vasily Khoruzhick <anarsoul at gmail.com>
>>> wrote:
>>>>
>>>> Use dmaengine instead of legacy s3c24xx DMA API for s3c24xx and s3c2412
>>>
>>>
>>> Please discard this series, I'd like to use
>>> dma_request_slave_channel_compat() to request a dma channel here,
>>> to simpify migration to DT later.
>>
>>
>> When you use the generic DMAengine PCM driver, migration to DT essentially
>> comes for free, you don't need to do anything special other than not
>> specifying the NO_DT flag.
>>
>> - Lars
>
> Hi Lars, all,
>
> But how do I have to pass DMA channel number for non-DT boot? I've
> seen that s3c64xx uses DMA resources at least for I2S and SPI,
> but Arnd suggested to use platform data. What's preffered way?

I don't think it matters, both isn't really that nice, but we currently do 
not have a nice way to specify the DMA channel on non-DT platforms. What's 
missing the a equivalent of the GPIO descriptor lookup tables, but for DMA 
channels.

- Lars