[...]

quoted

                                    ---> Parent domain-2 (Contains Perfomance states)
                                    |
                                    |
C.) DeviceX  --->  Parent-domain-1  |
                                    |
                                    |
                                    ---> Parent domain-3 (Contains Perfomance states)

I'm a bit confused. How does a domain have 2 parent domains?

This comes from the early design of the generic PM domain, thus I
assume we have some HW with such complex PM topology. However, I don't
know if it is actually being used.

Moreover, the corresponding DT bindings for "power-domains" parents,
can easily be extended to cover more than one parent. See more in
Documentation/devicetree/bindings/power/power_domain.txt

[...]

Kind regards
Uffe
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