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irqchip/ast2700-intc: Add AST2700-A2 support

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The AST2700 interrupt fabric is shared by multiple integrated processors
(PSP/SSP/TSP/BootMCU), each with its own interrupt controller and its own
devicetree view of the system. As a result, interrupt routing cannot be
treated as fixed: the valid route for a peripheral interrupt depends on
which processor is consuming it.

The INTC0 driver models this by creating a hierarchical irqdomain under
the upstream interrupt controller selected by the interrupt-parent
property in the devicetree. Information derived from this relationship
is incorporated into the route resolution logic for the controller.

The INTC1 driver implements the banked INTM-fed controller and forwards
interrupts toward INTC0, without embedding assumptions about the final
destination processor.

Signed-off-by: Ryan Chen <ryan_chen@aspeedtech.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260407-irqchip-v5-2-c0b0a300a057@aspeedtech.com
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Ryan Chen 2026-04-07 11:08:05 +08:00 • committed by Thomas Gleixner
commit 07825e4151
6 changed files with 1029 additions and 0 deletions
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