On Thu, Feb 25, 2021 at 9:17 PM Mark Brown <broonie@xxxxxxxxxx> wrote: > > On Thu, Feb 25, 2021 at 08:08:32PM +0800, Shengjiu Wang wrote: > > > If sound card doesn't need specific codec device, just > > dummy codec is enough, then we can link the dummy component > > directly. > > This is a big red flag - what circumstances are these? If it's a simple > CODEC with no control then the general approach is to provide a driver > which announces the capabilities of the CODEC and can be bound to as > normal, the dummy component should never actively be used. For the DMIC, SPDIF, HDMI ARC device or other similar device that there is no codec connected, then dummy codec is just used for registering the sound card. best regards wang shengjiu
