Hi
> > The main problem is about sysclk: when there is no clock in the DT,
> > you get the clock of the CPU or CODEC DAI. In my system, two clocks
> > are declared in the controller CPU DAI, but there is no .set_sysclk
> > pointer. So, snd_soc_dai_set_sysclk() returns -EINVAL and the card is
> > not created.
>
> set_sysclk() should be returning -ENOTSUPP in this case as with
> set_fmt() and the generic code then ignoring that error.
>
> > As I don't know why you need these fmt and sysclk, may you have a
> > look at these problems?
>
> The overwhelming majority of combinations of devices need a format
> specifying (usually one will be imposed by the system design even if
> both devices could be master).
If my understanding is correct, this patch is the reason ?
71467e46414d3bab220de77d3d085be0c0aa03e1
(ASoC: simple-card: Add device's module clock selection)
It seems break non .set_sysclk drivers.
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