On Thu, Mar 11, 2021 at 11:11:15PM +0100, Michael Walle wrote:

Am 2021-03-11 17:15, schrieb Mark Brown:

quoted

The trick is figuring out if it's best to vary the input clock
or to use the FLL to adapt a fixed input clock,

For simple-audio-card you can set the "clock" property if you want
that clock to be changed/enabled/disabled. But that doesn't seem to
be the way to go, at least it was NAKed by Rob for the audio-graph-card.
I don't see a way to figure out if MCLK should be controlled by
simple-*-card without adding further properties to the device tree.

If the card has a clock API clock as sysclk then set_sysclk(() should
be configuring that clock.