CCed Mark and Liam.
On Fri, Sep 19, 2014 at 05:18:08PM +0200, Jean-Michel Hautbois wrote:
Hi,
I am now working on making my audio path working completely. And I get some difficulties to write a DT for my needs. I join a picture which is not the reality but a simplified version of the board.
I have a FPGA between my codecs and my i.MX6. This FPGA is responsible of lots of things, and in particular of muxing signals. I can program it in order to get the audio signal I want on the SSI I want (so sgtl5000 can ben on SSI1 or SSI2 or both). This path is not a single codec, but a multiple codec one. So I can have on SSI1 LineIn from sgtl5000 or audio from hdmi (adv7611).
I don't know how to write it in DT, regarding audmux for instance, and the sound{} node... And I don't know how to drive all these peripherals (from arecord, I wish I have hw:0,0 is LineIn, hw:0;1 is HDMI, etc.).
This looks like a DPCM (Documentation/sound/alsa/soc/DPCM.txt) to me.
I'm not sure how to write a DT for DPCM either. But it seems that you might need a specific machine driver (guessing).
I saw Morimoto-san plans to add DPCM into Simple Card, but not sure when they will finish it. Otherwise, you may use Simple Card while following their defined DT formats.
Nicolin