From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Brown <broonie@kernel.org>
Subject: Re: How to specify data format if playback/capture
 were different ?
Date: Sat, 25 May 2013 16:03:45 -0400
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To: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: Linux-ALSA <alsa-devel@alsa-project.org>, Lars-Peter Clausen <lars@metafoo.de>, Liam Girdwood <lgirdwood@gmail.com>, Simon <horms@verge.net.au>, Kuninori Morimoto <kuninori.morimoto.gx@gmail.com>
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On Thu, May 23, 2013 at 08:18:09PM -0700, Kuninori Morimoto wrote:

> > I think it is rather unusual that you want or need to set different formats
> > for capture and playback. Especially when BCLK and LRCLK are shared. That's
> > probably why it isn't supported yet.

> This (playback and capture wer different format) is first case for me.
> Maybe ak4554 is very special.
> OK, I understand, thank you very much

The reason this is only supported is that there's an assumption that the
DAI will have the same clocks for both directions - if the clocks can be
formatted differently then it looks a lot like two separate interfaces.

It's also a bit odd to want to use different formats, there's rarely any
reason to do that.

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