[alsa-devel] Sharing PXA SSP ports

The current API for requesting an SSP port on PXA platforms assumes that the caller of pxa_ssp_request() is the only user of this port, so both input and output streams must be implemented in the same driver.

In a new setup I'm working on, this is not sufficient as we connect one codec to the input stream and another one to the output stream of the same CPU DAI "pxa-ssp-dai.0". I'm currently using a hack that disables the use count check in pxa_ssp_request(), but I certainly need a cleaner solution.

What would be a good approach? Would we need a multiplexer for this hardware bus, or can we extend the DAI driver in any clever way to achieve that? Or is there a solution already I just don't know about?

Thanks, Daniel