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doc: migration-guide: 3.7: add note on multilevel interrupt arch changes

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Add a note on the revamp of the multilevel interrupt
architecture, the changes to be made, and new macros to help
with the update.

Signed-off-by: Yong Cong Sin <ycsin@meta.com>
This commit is contained in:
Yong Cong Sin 2024-01-24 15:04:15 +08:00 • committed by Johan Hedberg
commit 2300f8a445
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doc/releases/migration-guide-3.7.rst
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@ -301,6 +301,20 @@ Input
Interrupt Controller
====================
* The static auto-generation of the multilevel interrupt controller lookup table has been
deprecated, and will be compiled only when the new compatibility Kconfig:
:kconfig:option:`CONFIG_LEGACY_MULTI_LEVEL_TABLE_GENERATION` is enabled, which will eventually
be removed in the coming releases.
Multi-level interrupt controller drivers should be updated to use the newly created
``IRQ_PARENT_ENTRY_DEFINE`` macro to register itself with the new multi-level interrupt
architecture. To make the macro easier to use, ``INTC_INST_ISR_TBL_OFFSET`` macro is made to
deduce the software ISR table offset for a given driver instance, for pseudo interrupt controller
child, use the ``INTC_CHILD_ISR_TBL_OFFSET`` macro instead. New devicetree macros
(``DT_INTC_GET_AGGREGATOR_LEVEL`` & ``DT_INST_INTC_GET_AGGREGATOR_LEVEL``) have been added
for an interrupt controller driver instance to pass its aggregator level into the
``IRQ_PARENT_ENTRY_DEFINE`` macro.
LED Strip
=========