xref: /linux/Documentation/devicetree/bindings/interrupt-controller/fsl,mu-msi.yaml (revision 9f2c9170934eace462499ba0bfe042cc72900173) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/interrupt-controller/fsl,mu-msi.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Freescale/NXP i.MX Messaging Unit (MU) work as msi controller
8
9maintainers:
10  - Frank Li <Frank.Li@nxp.com>
11
12description: |
13  The Messaging Unit module enables two processors within the SoC to
14  communicate and coordinate by passing messages (e.g. data, status
15  and control) through the MU interface. The MU also provides the ability
16  for one processor (A side) to signal the other processor (B side) using
17  interrupts.
18
19  Because the MU manages the messaging between processors, the MU uses
20  different clocks (from each side of the different peripheral buses).
21  Therefore, the MU must synchronize the accesses from one side to the
22  other. The MU accomplishes synchronization using two sets of matching
23  registers (Processor A-side, Processor B-side).
24
25  MU can work as msi interrupt controller to do doorbell
26
27allOf:
28  - $ref: /schemas/interrupt-controller/msi-controller.yaml#
29
30properties:
31  compatible:
32    enum:
33      - fsl,imx6sx-mu-msi
34      - fsl,imx7ulp-mu-msi
35      - fsl,imx8ulp-mu-msi
36      - fsl,imx8ulp-mu-msi-s4
37
38  reg:
39    items:
40      - description: a side register base address
41      - description: b side register base address
42
43  reg-names:
44    items:
45      - const: processor-a-side
46      - const: processor-b-side
47
48  interrupts:
49    description: a side interrupt number.
50    maxItems: 1
51
52  clocks:
53    maxItems: 1
54
55  power-domains:
56    items:
57      - description: a side power domain
58      - description: b side power domain
59
60  power-domain-names:
61    items:
62      - const: processor-a-side
63      - const: processor-b-side
64
65  interrupt-controller: true
66
67  msi-controller: true
68
69  "#msi-cells":
70    const: 0
71
72required:
73  - compatible
74  - reg
75  - interrupts
76  - interrupt-controller
77  - msi-controller
78  - "#msi-cells"
79
80additionalProperties: false
81
82examples:
83  - |
84    #include <dt-bindings/interrupt-controller/arm-gic.h>
85    #include <dt-bindings/firmware/imx/rsrc.h>
86
87    msi-controller@5d270000 {
88        compatible = "fsl,imx6sx-mu-msi";
89        msi-controller;
90        #msi-cells = <0>;
91        interrupt-controller;
92        reg = <0x5d270000 0x10000>,     /* A side */
93              <0x5d300000 0x10000>;     /* B side */
94        reg-names = "processor-a-side", "processor-b-side";
95        interrupts = <GIC_SPI 191 IRQ_TYPE_LEVEL_HIGH>;
96        power-domains = <&pd IMX_SC_R_MU_12A>,
97                        <&pd IMX_SC_R_MU_12B>;
98        power-domain-names = "processor-a-side", "processor-b-side";
99    };
100