1# SPDX-License-Identifier: GPL-2.0
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/interrupt-controller/arm,gic.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: ARM Generic Interrupt Controller v1 and v2
8
9maintainers:
10  - Marc Zyngier <marc.zyngier@arm.com>
11
12description: |+
13  ARM SMP cores are often associated with a GIC, providing per processor
14  interrupts (PPI), shared processor interrupts (SPI) and software
15  generated interrupts (SGI).
16
17  Primary GIC is attached directly to the CPU and typically has PPIs and SGIs.
18  Secondary GICs are cascaded into the upward interrupt controller and do not
19  have PPIs or SGIs.
20
21allOf:
22  - $ref: /schemas/interrupt-controller.yaml#
23
24properties:
25  compatible:
26    oneOf:
27      - items:
28          - enum:
29              - arm,arm11mp-gic
30              - arm,cortex-a15-gic
31              - arm,cortex-a7-gic
32              - arm,cortex-a5-gic
33              - arm,cortex-a9-gic
34              - arm,eb11mp-gic
35              - arm,gic-400
36              - arm,pl390
37              - arm,tc11mp-gic
38              - nvidia,tegra210-agic
39              - qcom,msm-8660-qgic
40              - qcom,msm-qgic2
41
42      - items:
43          - const: arm,arm1176jzf-devchip-gic
44          - const: arm,arm11mp-gic
45
46      - items:
47          - const: brcm,brahma-b15-gic
48          - const: arm,cortex-a15-gic
49
50  interrupt-controller: true
51
52  "#address-cells":
53    enum: [ 0, 1 ]
54  "#size-cells":
55    const: 1
56
57  "#interrupt-cells":
58    const: 3
59    description: |
60      The 1st cell is the interrupt type; 0 for SPI interrupts, 1 for PPI
61      interrupts.
62
63      The 2nd cell contains the interrupt number for the interrupt type.
64      SPI interrupts are in the range [0-987].  PPI interrupts are in the
65      range [0-15].
66
67      The 3rd cell is the flags, encoded as follows:
68        bits[3:0] trigger type and level flags.
69          1 = low-to-high edge triggered
70          2 = high-to-low edge triggered (invalid for SPIs)
71          4 = active high level-sensitive
72          8 = active low level-sensitive (invalid for SPIs).
73        bits[15:8] PPI interrupt cpu mask.  Each bit corresponds to each of
74        the 8 possible cpus attached to the GIC.  A bit set to '1' indicated
75        the interrupt is wired to that CPU.  Only valid for PPI interrupts.
76        Also note that the configurability of PPI interrupts is IMPLEMENTATION
77        DEFINED and as such not guaranteed to be present (most SoC available
78        in 2014 seem to ignore the setting of this flag and use the hardware
79        default value).
80
81  reg:
82    description: |
83      Specifies base physical address(s) and size of the GIC registers. The
84      first region is the GIC distributor register base and size. The 2nd region
85      is the GIC cpu interface register base and size.
86
87      For GICv2 with virtualization extensions, additional regions are
88      required for specifying the base physical address and size of the VGIC
89      registers. The first additional region is the GIC virtual interface
90      control register base and size. The 2nd additional region is the GIC
91      virtual cpu interface register base and size.
92    minItems: 2
93    maxItems: 4
94
95  interrupts:
96    description: Interrupt source of the parent interrupt controller on
97      secondary GICs, or VGIC maintenance interrupt on primary GIC (see
98      below).
99    maxItems: 1
100
101  cpu-offset:
102    description: per-cpu offset within the distributor and cpu interface
103      regions, used when the GIC doesn't have banked registers. The offset
104      is cpu-offset * cpu-nr.
105    $ref: /schemas/types.yaml#/definitions/uint32
106
107  clocks:
108    minItems: 1
109    maxItems: 2
110
111  clock-names:
112    description: List of names for the GIC clock input(s). Valid clock names
113      depend on the GIC variant.
114    oneOf:
115      - const: ic_clk # for "arm,arm11mp-gic"
116      - const: PERIPHCLKEN # for "arm,cortex-a15-gic"
117      - items: # for "arm,cortex-a9-gic"
118          - const: PERIPHCLK
119          - const: PERIPHCLKEN
120      - const: clk # for "arm,gic-400" and "nvidia,tegra210"
121      - const: gclk #for "arm,pl390"
122
123  power-domains:
124    maxItems: 1
125
126required:
127  - compatible
128  - reg
129
130patternProperties:
131  "^v2m@[0-9a-f]+$":
132    description: |
133      * GICv2m extension for MSI/MSI-x support (Optional)
134
135      Certain revisions of GIC-400 supports MSI/MSI-x via V2M register frame(s).
136      This is enabled by specifying v2m sub-node(s).
137
138    properties:
139      compatible:
140        const: arm,gic-v2m-frame
141
142      msi-controller: true
143
144      reg:
145        maxItems: 1
146        description: GICv2m MSI interface register base and size
147
148      arm,msi-base-spi:
149        description: When the MSI_TYPER register contains an incorrect value,
150          this property should contain the SPI base of the MSI frame, overriding
151          the HW value.
152        $ref: /schemas/types.yaml#/definitions/uint32
153
154      arm,msi-num-spis:
155        description: When the MSI_TYPER register contains an incorrect value,
156          this property should contain the number of SPIs assigned to the
157          frame, overriding the HW value.
158        $ref: /schemas/types.yaml#/definitions/uint32
159
160    required:
161      - compatible
162      - msi-controller
163      - reg
164
165    additionalProperties: false
166
167additionalProperties: false
168
169examples:
170  - |
171    // GICv1
172    intc: interrupt-controller@fff11000 {
173      compatible = "arm,cortex-a9-gic";
174      #interrupt-cells = <3>;
175      #address-cells = <1>;
176      interrupt-controller;
177      reg = <0xfff11000 0x1000>,
178            <0xfff10100 0x100>;
179    };
180
181  - |
182    // GICv2
183    interrupt-controller@2c001000 {
184      compatible = "arm,cortex-a15-gic";
185      #interrupt-cells = <3>;
186      interrupt-controller;
187      reg = <0x2c001000 0x1000>,
188            <0x2c002000 0x2000>,
189            <0x2c004000 0x2000>,
190            <0x2c006000 0x2000>;
191      interrupts = <1 9 0xf04>;
192    };
193
194  - |
195    // GICv2m extension for MSI/MSI-x support
196    interrupt-controller@e1101000 {
197      compatible = "arm,gic-400";
198      #interrupt-cells = <3>;
199      #address-cells = <2>;
200      #size-cells = <2>;
201      interrupt-controller;
202      interrupts = <1 8 0xf04>;
203      ranges = <0 0 0 0xe1100000 0 0x100000>;
204      reg = <0x0 0xe1110000 0 0x01000>,
205            <0x0 0xe112f000 0 0x02000>,
206            <0x0 0xe1140000 0 0x10000>,
207            <0x0 0xe1160000 0 0x10000>;
208
209      v2m0: v2m@8000 {
210        compatible = "arm,gic-v2m-frame";
211        msi-controller;
212        reg = <0x0 0x80000 0 0x1000>;
213      };
214
215      //...
216
217      v2mN: v2m@9000 {
218        compatible = "arm,gic-v2m-frame";
219        msi-controller;
220        reg = <0x0 0x90000 0 0x1000>;
221      };
222    };
223...
224