On Wed, Aug 08, 2012 at 11:21:20AM +0300, Ziv Haziz wrote:

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I n that case what you're saying above with a DAI link is exactly what you're supposed to do, I don't see any structural problem here?

Creating two dai links will create two separated devices which must be open for setting configurations, but the dsp-codec dai cannot be started (or I will get an error). This means changing the codec driver to enable everything not from trigger callback.

Is it possible to have a dai link without a platform for data transfer? I saw in the plumbers agenda you are going to talk on codec-codec interface - do you have any preliminary suggestion?

This is already supported in mainline, look at littlemill for one example user.

Alternatively for older kernels you can easily support this from userspace by just not starting the DMA, this has been deployed for some considerable time on many systems (OpenMoko is one long standing mainline example).