Mark Brown wrote:

The machine support code (fabric driver in PowerPC terms, I think?)
tells the core how everything is connected together by registering
devices representing the links (eg, I2S) between the codecs, CPU and
other devices.  The ASoC core is then responsible for ensuring that all
the required components are present before it registers with the ALSA
core.

I'm no expert on this, but I think from the PowerPC point-of-view, the *ideal* 
situation would be if the ASoC fabric driver were generic, maybe even part of 
ASoC itself, and everything it needed could be obtained from the device tree.

-- 
Timur Tabi
Linux Kernel Developer @ Freescale