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33 lines
1.3 KiB
33 lines
1.3 KiB
* Mediatek 27xx cirq |
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In Mediatek SOCs, the CIRQ is a low power interrupt controller designed to |
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work outside MCUSYS which comprises with Cortex-Ax cores,CCI and GIC. |
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The external interrupts (outside MCUSYS) will feed through CIRQ and connect |
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to GIC in MCUSYS. When CIRQ is enabled, it will record the edge-sensitive |
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interrupts and generate a pulse signal to parent interrupt controller when |
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flush command is executed. With CIRQ, MCUSYS can be completely turned off |
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to improve the system power consumption without losing interrupts. |
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Required properties: |
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- compatible: should be one of |
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- "mediatek,mt2701-cirq" for mt2701 CIRQ |
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- "mediatek,mt8135-cirq" for mt8135 CIRQ |
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- "mediatek,mt8173-cirq" for mt8173 CIRQ |
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and "mediatek,cirq" as a fallback. |
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- interrupt-controller : Identifies the node as an interrupt controller. |
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- #interrupt-cells : Use the same format as specified by GIC in arm,gic.txt. |
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- reg: Physical base address of the cirq registers and length of memory |
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mapped region. |
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- mediatek,ext-irq-range: Identifies external irq number range in different |
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SOCs. |
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Example: |
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cirq: interrupt-controller@10204000 { |
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compatible = "mediatek,mt2701-cirq", |
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"mediatek,mtk-cirq"; |
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interrupt-controller; |
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#interrupt-cells = <3>; |
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interrupt-parent = <&sysirq>; |
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reg = <0 0x10204000 0 0x400>; |
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mediatek,ext-irq-start = <32 200>; |
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};
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