quoted

Since UIC1 is cascaded off UIC0 in the interrupt tree,
UIC1 should have an interrupt-parent pointing to UIC0
so the interrupt tree can be traversed to the root.

Not necessary if UIC0 is the device tree parent of UIC1.

For the archives: this is wrong, all interrupt controllers
(except the root one) are required to have an "interrupt-parent"
property -- this is how the root interrupt controller is
determined.


Segher