xref: /linux/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml (revision 24bce201d79807b668bf9d9e0aca801c5c0d5f78) 
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@foss.st.com>
15  - Arnaud Pouliquen <arnaud.pouliquen@foss.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    $ref: "/schemas/types.yaml#/definitions/phandle-array"
33    items:
34      - items:
35          - description: Phandle of syscon block
36          - description: The offset of the hold boot setting register
37          - description: The field mask of the hold boot
38
39  st,syscfg-tz:
40    description:
41      Reference to the system configuration which holds the RCC trust zone mode
42    $ref: "/schemas/types.yaml#/definitions/phandle-array"
43    items:
44      - items:
45          - description: Phandle of syscon block
46          - description: The offset of the trust zone setting register
47          - description: The field mask of the trust zone state
48
49  interrupts:
50    description: Should contain the WWDG1 watchdog reset interrupt
51    maxItems: 1
52
53  wakeup-source: true
54
55  mboxes:
56    description:
57      This property is required only if the rpmsg/virtio functionality is used.
58    items:
59      - description: |
60          A channel (a) used to communicate through virtqueues with the
61          remote proc.
62          Bi-directional channel:
63            - from local to remote = send message
64            - from remote to local = send message ack
65      - description: |
66          A channel (b) working the opposite direction of channel (a)
67      - description: |
68          A channel (c) used by the local proc to notify the remote proc that it
69          is about to be shut down.
70          Unidirectional channel:
71            - from local to remote, where ACK from the remote means that it is
72              ready for shutdown
73      - description: |
74          A channel (d) used by the local proc to notify the remote proc that it
75          has to stop interprocessor communnication.
76          Unidirectional channel:
77            - from local to remote, where ACK from the remote means that communnication
78              as been stopped on the remote side.
79    minItems: 1
80
81  mbox-names:
82    items:
83      - const: vq0
84      - const: vq1
85      - const: shutdown
86      - const: detach
87    minItems: 1
88
89  memory-region:
90    description:
91      List of phandles to the reserved memory regions associated with the
92      remoteproc device. This is variable and describes the memories shared with
93      the remote processor (e.g. remoteproc firmware and carveouts, rpmsg
94      vrings, ...).
95      (see ../reserved-memory/reserved-memory.txt)
96
97  st,syscfg-pdds:
98    $ref: "/schemas/types.yaml#/definitions/phandle-array"
99    description: |
100      Reference to the system configuration which holds the remote
101    items:
102      - items:
103          - description: Phandle of syscon block
104          - description: The offset of the power setting register
105          - description: The field mask of the PDDS selection
106
107  st,syscfg-m4-state:
108    $ref: "/schemas/types.yaml#/definitions/phandle-array"
109    description: |
110      Reference to the tamp register which exposes the Cortex-M4 state.
111    items:
112      - items:
113          - description: Phandle of syscon block with the tamp register
114          - description: The offset of the tamp register
115          - description: The field mask of the Cortex-M4 state
116
117  st,syscfg-rsc-tbl:
118    $ref: "/schemas/types.yaml#/definitions/phandle-array"
119    description: |
120      Reference to the tamp register which references the Cortex-M4
121      resource table address.
122    items:
123      - items:
124          - description: Phandle of syscon block with the tamp register
125          - description: The offset of the tamp register
126          - description: The field mask of the Cortex-M4 resource table address
127
128  st,auto-boot:
129    $ref: /schemas/types.yaml#/definitions/flag
130    description:
131      If defined, when remoteproc is probed, it loads the default firmware and
132      starts the remote processor.
133
134required:
135  - compatible
136  - reg
137  - resets
138  - st,syscfg-holdboot
139  - st,syscfg-tz
140
141additionalProperties: false
142
143examples:
144  - |
145    #include <dt-bindings/reset/stm32mp1-resets.h>
146    m4_rproc: m4@10000000 {
147      compatible = "st,stm32mp1-m4";
148      reg = <0x10000000 0x40000>,
149            <0x30000000 0x40000>,
150            <0x38000000 0x10000>;
151      resets = <&rcc MCU_R>;
152      st,syscfg-holdboot = <&rcc 0x10C 0x1>;
153      st,syscfg-tz = <&rcc 0x000 0x1>;
154      st,syscfg-rsc-tbl = <&tamp 0x144 0xFFFFFFFF>;
155      st,syscfg-m4-state = <&tamp 0x148 0xFFFFFFFF>;
156    };
157
158...
159