[alsa-devel] [PATCH v3] ARM: kirkwood: extend the kirkwood i2s driver for DT usage

Sebastian Hesselbarth sebastian.hesselbarth at gmail.com
Tue Jul 23 15:30:57 CEST 2013

On 07/23/13 15:20, Mark Brown wrote:
> On Tue, Jul 23, 2013 at 02:59:06PM +0200, Sebastian Hesselbarth wrote:
>> On 07/23/13 14:34, Mark Brown wrote:
>>> As others have pointed out if you need to change the clock get code
>>> there's something wrong here, DT should be handled transparently by the
>>> clock API.
>> IMHO the reason why of_clk_get() was/is mis-used in that way is mostly
>> compatibility with legacy platform_data based setup.
> I'm sorry, but this doesn't make a great deal of sense to me.  Can you
> be more specific?
>> As Sascha Hauer pointed out, clocks should be distinguished by names
>> (clock-names property) instead of position and then use
>> devm_clk_get(&pdev->dev, "internal") and
>> devm_clk_get(&pdev->dev, "external") respectively.
>> This will possibly also require to update platform_data and legacy
>> users of kirkwood-i2s or have different setup functions for non-DT
>> and DT.
> Why would this be required?  The driver is already asking for multiple
> clocks...

The driver is asking for multiple *DT based* clocks. Legacy
platform_data has never been updated to reflect that. Mainly because
multiple clocks are only supported on Dove, which has no active non-DT
board in mainline.

>> Also, while ASoC API separates the audio-controller into cpu-side
>> and codec-side parts, the DT should not. IIRC and as Russell repeated
> You mean DAI and DMA here?  I already commented on that in my review of
> the DMA binding.


>> again, we mentioned to merge kirkwood-i2s.c and kirkwood-dma.c into
>> a single file, didn't we?
> That's been discussed several times but nobody's actually done it.

Correct, that is why I repeated that request to Jean-Francois.


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