On Fri, Feb 26, 2021 at 01:58:12PM +0800, Shengjiu Wang wrote:
> On Tue, Feb 23, 2021 at 9:58 PM Mark Brown <broonie@kernel.org> wrote:

> > I'm not sure having two DAIs is an issue if you have them running the
> > smae format - does it cause any practical problems or is it just that it
> > doesn't seem elegant to you?  There were quite a few devices that pretty
> > much just had two unidirectional DAIs, in those cases it seems like a
> > sensible representation for the hardware.  If you can set unrelated
> > formats on transmit and receive then it's not clear that it's actually
> > the same DAI in anything except logical labelling.

> When an i2s device, Sometimes it is connected as async mode, there is
> different clock for tx and rx then there should be two DAIs,  Sometimes
> it is connected as sync mode, then there should be one DAI.

> So we need to register different DAIs according to the async or sync mode
> when the driver probes. right?

You should just be able to connect the same device twice for the other
end of the link, once for Tx and once for Rx.