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    Subject[PATCH 0/3] Add Mediatek CIRQ interrupt controller
    Date
    In Mediatek SOCs, the CIRQ is a low power interrupt controller designed to
    works outside MCUSYS which comprises with Cortex-Ax cores,CCI and GIC.

    The CIRQ controller is integrated in between MCUSYS and interrupt sources
    as the second level interrupt controller. The external interrupts which
    outside MCUSYS will feed through CIRQ then bypass to GIC.

    In normal mode(where MCUSYS is active), CIRQ is disabled and interrupts
    will directly issue to MCUSYS. When MCUSYS enters sleep mode, where GIC
    is power downed. CIRQ will be enabled and monitor all edge trigger
    interrupts(only edge trigger interrupts will be lost in this scenario).
    When an edge interrupt is triggered, CIRQ will record the status and
    generated a pulse signal to GIC when flush command is executed.

    With CIRQ, MCUSYS can be completely turned off to improve the system
    power consumption without losing interrupts.

    Youlin Pei (3):
    binding: irqchip: mtk-cirq: Add binding document
    irqchip: mtk-cirq: Add mediatek mtk-cirq implement
    ARM: dts: mt2701: Add mtk-cirq node for mt2701

    .../interrupt-controller/mediatek,cirq.txt | 30 +++
    arch/arm/boot/dts/mt2701.dtsi | 11 +-
    drivers/irqchip/Makefile | 2 +-
    drivers/irqchip/irq-mtk-cirq.c | 257 +++++++++++++++++++++
    4 files changed, 298 insertions(+), 2 deletions(-)
    create mode 100644 Documentation/devicetree/bindings/interrupt-controller/mediatek,cirq.txt
    create mode 100644 drivers/irqchip/irq-mtk-cirq.c

    --
    1.9.1

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