Mark,
You should convert the DAI drivers to probe as normal platform devices and attach the resources used by the CPU to those devices rather than attaching the data to soc-audio. pxa2xx-ac97 does this, as do the PowerPC drivers and the s3c64xx-i2s driver. The DaVinci drivers currently on the davinci branch of my git for merge after the merge window do this too.
I see now what you mean, but this is ugly as sin: I now need to register 2 platform devices in the board code: 1 for the DAI (with resources mmio + irq) and 1 for the DMA engine (with ddma id resources), or register the DMA engine device from within the AC97/I2S drivers.
This is in my opinion even worse than the current scheme, which at least allows me to group all PSC resources into one struct resource which all audio-related drivers can share without too much uglyness.
Manuel Lauss