1# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: "http://devicetree.org/schemas/remoteproc/st,stm32-rproc.yaml#"
5$schema: "http://devicetree.org/meta-schemas/core.yaml#"
6
7title: STMicroelectronics STM32 remote processor controller bindings
8
9description:
10  This document defines the binding for the remoteproc component that loads and
11  boots firmwares on the ST32MP family chipset.
12
13maintainers:
14  - Fabien Dessenne <fabien.dessenne@st.com>
15  - Arnaud Pouliquen <arnaud.pouliquen@st.com>
16
17properties:
18  compatible:
19    const: st,stm32mp1-m4
20
21  reg:
22    description:
23      Address ranges of the RETRAM and MCU SRAM memories used by the remote
24      processor.
25    maxItems: 3
26
27  resets:
28    maxItems: 1
29
30  st,syscfg-holdboot:
31    description: remote processor reset hold boot
32      - Phandle of syscon block.
33      - The offset of the hold boot setting register.
34      - The field mask of the hold boot.
35    $ref: "/schemas/types.yaml#/definitions/phandle-array"
36    maxItems: 1
37
38  st,syscfg-tz:
39    description:
40      Reference to the system configuration which holds the RCC trust zone mode
41    $ref: "/schemas/types.yaml#/definitions/phandle-array"
42    maxItems: 1
43
44  interrupts:
45    description: Should contain the WWDG1 watchdog reset interrupt
46    maxItems: 1
47
48  wakeup-source: true
49
50  mboxes:
51    description:
52      This property is required only if the rpmsg/virtio functionality is used.
53    items:
54      - description: |
55          A channel (a) used to communicate through virtqueues with the
56          remote proc.
57          Bi-directional channel:
58            - from local to remote = send message
59            - from remote to local = send message ack
60      - description: |
61          A channel (b) working the opposite direction of channel (a)
62      - description: |
63          A channel (c) used by the local proc to notify the remote proc that it
64          is about to be shut down.
65          Unidirectional channel:
66            - from local to remote, where ACK from the remote means that it is
67              ready for shutdown
68    minItems: 1
69    maxItems: 3
70
71  mbox-names:
72    items:
73      - const: vq0
74      - const: vq1
75      - const: shutdown
76    minItems: 1
77    maxItems: 3
78
79  memory-region:
80    description:
81      List of phandles to the reserved memory regions associated with the
82      remoteproc device. This is variable and describes the memories shared with
83      the remote processor (e.g. remoteproc firmware and carveouts, rpmsg
84      vrings, ...).
85      (see ../reserved-memory/reserved-memory.txt)
86
87  st,syscfg-pdds:
88    $ref: "/schemas/types.yaml#/definitions/phandle-array"
89    description: |
90      Reference to the system configuration which holds the remote
91    maxItems: 1
92
93  st,syscfg-m4-state:
94    $ref: "/schemas/types.yaml#/definitions/phandle-array"
95    description: |
96      Reference to the tamp register which exposes the Cortex-M4 state.
97    maxItems: 1
98
99  st,syscfg-rsc-tbl:
100    $ref: "/schemas/types.yaml#/definitions/phandle-array"
101    description: |
102      Reference to the tamp register which references the Cortex-M4
103      resource table address.
104    maxItems: 1
105
106  st,auto-boot:
107    $ref: /schemas/types.yaml#/definitions/flag
108    description:
109      If defined, when remoteproc is probed, it loads the default firmware and
110      starts the remote processor.
111
112required:
113  - compatible
114  - reg
115  - resets
116  - st,syscfg-holdboot
117  - st,syscfg-tz
118
119additionalProperties: false
120
121examples:
122  - |
123    #include <dt-bindings/reset/stm32mp1-resets.h>
124    m4_rproc: m4@10000000 {
125      compatible = "st,stm32mp1-m4";
126      reg = <0x10000000 0x40000>,
127            <0x30000000 0x40000>,
128            <0x38000000 0x10000>;
129      resets = <&rcc MCU_R>;
130      st,syscfg-holdboot = <&rcc 0x10C 0x1>;
131      st,syscfg-tz = <&rcc 0x000 0x1>;
132      st,syscfg-rsc-tbl = <&tamp 0x144 0xFFFFFFFF>;
133      st,syscfg-m4-state = <&tamp 0x148 0xFFFFFFFF>;
134    };
135
136...
137