ccf: where to put constraints?

[Wolfram Sang]

Hi Sören,

> I.e. when a clock consumer needs to be notified about its input clock
> being changed it registers a clock notifier.

I found the notifiers, too, but I am still not sure they are proper for
my case. There, CPU and GPU clocks are siblings, there is no
parent-child relationship.

Anyhow, I have been told cpufreq is not needed currently, so this task
is postponed. Thanks for the input nonetheless!

   Wolfram

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