xref: /linux/Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml (revision f4738f56d1dc62aaba69b33702a5ab098f1b8c63) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/interrupt-controller/apple,aic.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Apple Interrupt Controller
8
9maintainers:
10  - Hector Martin <marcan@marcan.st>
11
12description: |
13  The Apple Interrupt Controller is a simple interrupt controller present on
14  Apple ARM SoC platforms, including various iPhone and iPad devices and the
15  "Apple Silicon" Macs.
16
17  It provides the following features:
18
19  - Level-triggered hardware IRQs wired to SoC blocks
20    - Single mask bit per IRQ
21    - Per-IRQ affinity setting
22    - Automatic masking on event delivery (auto-ack)
23    - Software triggering (ORed with hw line)
24  - 2 per-CPU IPIs (meant as "self" and "other", but they are interchangeable
25    if not symmetric)
26  - Automatic prioritization (single event/ack register per CPU, lower IRQs =
27    higher priority)
28  - Automatic masking on ack
29  - Default "this CPU" register view and explicit per-CPU views
30
31  This device also represents the FIQ interrupt sources on platforms using AIC,
32  which do not go through a discrete interrupt controller.
33
34allOf:
35  - $ref: /schemas/interrupt-controller.yaml#
36
37properties:
38  compatible:
39    items:
40      - const: apple,t8103-aic
41      - const: apple,aic
42
43  interrupt-controller: true
44
45  '#interrupt-cells':
46    const: 3
47    description: |
48      The 1st cell contains the interrupt type:
49        - 0: Hardware IRQ
50        - 1: FIQ
51
52      The 2nd cell contains the interrupt number.
53        - HW IRQs: interrupt number
54        - FIQs:
55          - 0: physical HV timer
56          - 1: virtual HV timer
57          - 2: physical guest timer
58          - 3: virtual guest timer
59          - 4: 'efficient' CPU PMU
60          - 5: 'performance' CPU PMU
61
62      The 3rd cell contains the interrupt flags. This is normally
63      IRQ_TYPE_LEVEL_HIGH (4).
64
65  reg:
66    description: |
67      Specifies base physical address and size of the AIC registers.
68    maxItems: 1
69
70  power-domains:
71    maxItems: 1
72
73  affinities:
74    type: object
75    additionalProperties: false
76    description:
77      FIQ affinity can be expressed as a single "affinities" node,
78      containing a set of sub-nodes, one per FIQ with a non-default
79      affinity.
80    patternProperties:
81      "^.+-affinity$":
82        type: object
83        additionalProperties: false
84        properties:
85          apple,fiq-index:
86            description:
87              The interrupt number specified as a FIQ, and for which
88              the affinity is not the default.
89            $ref: /schemas/types.yaml#/definitions/uint32
90            maximum: 5
91
92          cpus:
93            description:
94              Should be a list of phandles to CPU nodes (as described in
95              Documentation/devicetree/bindings/arm/cpus.yaml).
96
97        required:
98          - apple,fiq-index
99          - cpus
100
101required:
102  - compatible
103  - '#interrupt-cells'
104  - interrupt-controller
105  - reg
106
107additionalProperties: false
108
109examples:
110  - |
111    soc {
112        #address-cells = <2>;
113        #size-cells = <2>;
114
115        aic: interrupt-controller@23b100000 {
116            compatible = "apple,t8103-aic", "apple,aic";
117            #interrupt-cells = <3>;
118            interrupt-controller;
119            reg = <0x2 0x3b100000 0x0 0x8000>;
120        };
121    };
122