(sorry for only seeing this late)

[...]

+maintainers:
+  - John Crispin [off-list ref]

personally I think we should get at least John's Acked-by but I don't
know if there's any rule for adding a dt-binding for some other
maintainer

[...]

+required:
+  - compatible
+  - reg

based on "DOs and DON’Ts for designing and writing Devicetree bindings"
from [0] I think this is incomplete
As far as I know CGU contains some PLLs. These PLLs need at least one
input: the main XTAL which is found on the board

Also the Lantiq code does not use the common clock framework yet. Once
that's used we also need #clock-cells = <1>. I don't know if that
should be added already (or not).

+examples:
+  - |
+    cgu@103000 {

this should be clock-controller@...


Best regards,
Martin


[0] https://www.kernel.org/doc/html/latest/devicetree/bindings/writing-bindings.html