On Fri, Mar 12, 2021 at 01:30:02PM +0100, Michael Walle wrote:

> The card calls set_sysclk(), which eventually ends up in the codec.
> The codec therefore, could figure out if it needs to configure the
> clock or if it can use its internal FLL.
> Is that what you mean?

Yes.

> But the set_sysclk() of the codec isn't even called, because the
> card itself already tries to call clk_set_rate() on the Codec's MCLK,
> which returns with an error [0].

OK, so I think we need to push this down a level so that the clock
setting is implemented by the core/CODEC rather than by simple-card,
with the helpers being something the CODEC can opt out of.