122 lines
3.2 KiB
YAML
122 lines
3.2 KiB
YAML
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/interrupt-controller/apple,aic.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Apple Interrupt Controller
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maintainers:
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- Hector Martin <marcan@marcan.st>
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description: |
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The Apple Interrupt Controller is a simple interrupt controller present on
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Apple ARM SoC platforms, including various iPhone and iPad devices and the
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"Apple Silicon" Macs.
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It provides the following features:
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- Level-triggered hardware IRQs wired to SoC blocks
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- Single mask bit per IRQ
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- Per-IRQ affinity setting
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- Automatic masking on event delivery (auto-ack)
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- Software triggering (ORed with hw line)
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- 2 per-CPU IPIs (meant as "self" and "other", but they are interchangeable
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if not symmetric)
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- Automatic prioritization (single event/ack register per CPU, lower IRQs =
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higher priority)
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- Automatic masking on ack
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- Default "this CPU" register view and explicit per-CPU views
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This device also represents the FIQ interrupt sources on platforms using AIC,
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which do not go through a discrete interrupt controller.
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allOf:
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- $ref: /schemas/interrupt-controller.yaml#
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properties:
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compatible:
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items:
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- const: apple,t8103-aic
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- const: apple,aic
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interrupt-controller: true
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'#interrupt-cells':
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const: 3
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description: |
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The 1st cell contains the interrupt type:
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- 0: Hardware IRQ
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- 1: FIQ
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The 2nd cell contains the interrupt number.
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- HW IRQs: interrupt number
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- FIQs:
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- 0: physical HV timer
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- 1: virtual HV timer
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- 2: physical guest timer
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- 3: virtual guest timer
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- 4: 'efficient' CPU PMU
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- 5: 'performance' CPU PMU
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The 3rd cell contains the interrupt flags. This is normally
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IRQ_TYPE_LEVEL_HIGH (4).
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reg:
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description: |
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Specifies base physical address and size of the AIC registers.
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maxItems: 1
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power-domains:
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maxItems: 1
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affinities:
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type: object
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additionalProperties: false
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description:
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FIQ affinity can be expressed as a single "affinities" node,
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containing a set of sub-nodes, one per FIQ with a non-default
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affinity.
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patternProperties:
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"^.+-affinity$":
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type: object
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additionalProperties: false
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properties:
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apple,fiq-index:
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description:
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The interrupt number specified as a FIQ, and for which
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the affinity is not the default.
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$ref: /schemas/types.yaml#/definitions/uint32
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maximum: 5
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cpus:
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description:
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Should be a list of phandles to CPU nodes (as described in
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Documentation/devicetree/bindings/arm/cpus.yaml).
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required:
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- apple,fiq-index
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- cpus
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required:
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- compatible
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- '#interrupt-cells'
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- interrupt-controller
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- reg
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additionalProperties: false
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examples:
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- |
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soc {
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#address-cells = <2>;
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#size-cells = <2>;
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aic: interrupt-controller@23b100000 {
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compatible = "apple,t8103-aic", "apple,aic";
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#interrupt-cells = <3>;
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interrupt-controller;
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reg = <0x2 0x3b100000 0x0 0x8000>;
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};
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};
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