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