The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/interrupt-controller/mediatek,cirq.txt

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    1 * Mediatek 27xx cirq
    2 
    3 In Mediatek SOCs, the CIRQ is a low power interrupt controller designed to
    4 work outside MCUSYS which comprises with Cortex-Ax cores,CCI and GIC.
    5 The external interrupts (outside MCUSYS) will feed through CIRQ and connect
    6 to GIC in MCUSYS. When CIRQ is enabled, it will record the edge-sensitive
    7 interrupts and generate a pulse signal to parent interrupt controller when
    8 flush command is executed. With CIRQ, MCUSYS can be completely turned off
    9 to improve the system power consumption without losing interrupts.
   10 
   11 Required properties:
   12 - compatible: should be one of
   13   - "mediatek,mt2701-cirq" for mt2701 CIRQ
   14   - "mediatek,mt8135-cirq" for mt8135 CIRQ
   15   - "mediatek,mt8173-cirq" for mt8173 CIRQ
   16   and "mediatek,cirq" as a fallback.
   17 - interrupt-controller : Identifies the node as an interrupt controller.
   18 - #interrupt-cells : Use the same format as specified by GIC in arm,gic.txt.
   19 - reg: Physical base address of the cirq registers and length of memory
   20   mapped region.
   21 - mediatek,ext-irq-range: Identifies external irq number range in different
   22   SOCs.
   23 
   24 Example:
   25         cirq: interrupt-controller@10204000 {
   26                 compatible = "mediatek,mt2701-cirq",
   27                              "mediatek,mtk-cirq";
   28                 interrupt-controller;
   29                 #interrupt-cells = <3>;
   30                 interrupt-parent = <&sysirq>;
   31                 reg = <0 0x10204000 0 0x400>;
   32                 mediatek,ext-irq-start = <32 200>;
   33         };

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