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Hierarchical IRQ domains can be used to stack different IRQ controllers on top of each other. One specific use-case where this can be useful is if a power management controller has top-level controls for wakeup interrupts. In such cases, the power management controller can be a parent to other interrupt controllers and program additional registers when an IRQ has its wake capability enabled or disabled. Change-Id: I3f63cb13c0cd1b602d3205c40648d5e7d3c62d4d Patch-mainline: https://lore.kernel.org/patchwork/patch/989528/ Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Lina Iyer <ilina@codeaurora.org>