[alsa-devel] No pcm device?

I'm not sure if the hardware I have makes this problem simple for me, or difficult, because it seems to differ from other ASoC code. Basically, I have a i2s as transport, connected to max5556 driving the output. (and a few other chips related to amplification and muting) There is however no sound card, thus no PCM device. Now the question is how to proceed? In other words what kind of minimal PCM layer do I need if any?

Thanks