63f34d0109
This is a standard required property for interrupt controllers, and present on the bcm_lintc nodes for currently supported RPi models. For the RPi4, we have both bcm_lintc as well as GIC-400, but only one may be active at a time. Don't probe bcm_lintc if it's missing the "interrupt-controller" property -- in RPi 4 DTS, the bcm_lintc node is actually missing this along with other required interrupt properties. Presumably, if the earlier boot stages will support switching to the legacy interrupt controller (as is suggested possible by the documentation), the DTS will need to be updated to indicate the proper interrupt-parent and hopefully also mark this node as an interrupt-controller instead.
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