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      - description: |
69          A channel (d) used by the local proc to notify the remote proc that it
70          has to stop interprocessor communnication.
71          Unidirectional channel:
72            - from local to remote, where ACK from the remote means that communnication
73              as been stopped on the remote side.
74    minItems: 1
75    maxItems: 4
76
77  mbox-names:
78    items:
79      - const: vq0
80      - const: vq1
81      - const: shutdown
82      - const: detach
83    minItems: 1
84    maxItems: 4
85
86  memory-region:
87    description:
88      List of phandles to the reserved memory regions associated with the
89      remoteproc device. This is variable and describes the memories shared with
90      the remote processor (e.g. remoteproc firmware and carveouts, rpmsg
91      vrings, ...).
92      (see ../reserved-memory/reserved-memory.txt)
93
94  st,syscfg-pdds:
95    $ref: "/schemas/types.yaml#/definitions/phandle-array"
96    description: |
97      Reference to the system configuration which holds the remote
98    maxItems: 1
99
100  st,syscfg-m4-state:
101    $ref: "/schemas/types.yaml#/definitions/phandle-array"
102    description: |
103      Reference to the tamp register which exposes the Cortex-M4 state.
104    maxItems: 1
105
106  st,syscfg-rsc-tbl:
107    $ref: "/schemas/types.yaml#/definitions/phandle-array"
108    description: |
109      Reference to the tamp register which references the Cortex-M4
110      resource table address.
111    maxItems: 1
112
113  st,auto-boot:
114    $ref: /schemas/types.yaml#/definitions/flag
115    description:
116      If defined, when remoteproc is probed, it loads the default firmware and
117      starts the remote processor.
118
119required:
120  - compatible
121  - reg
122  - resets
123  - st,syscfg-holdboot
124  - st,syscfg-tz
125
126additionalProperties: false
127
128examples:
129  - |
130    #include <dt-bindings/reset/stm32mp1-resets.h>
131    m4_rproc: m4@10000000 {
132      compatible = "st,stm32mp1-m4";
133      reg = <0x10000000 0x40000>,
134            <0x30000000 0x40000>,
135            <0x38000000 0x10000>;
136      resets = <&rcc MCU_R>;
137      st,syscfg-holdboot = <&rcc 0x10C 0x1>;
138      st,syscfg-tz = <&rcc 0x000 0x1>;
139      st,syscfg-rsc-tbl = <&tamp 0x144 0xFFFFFFFF>;
140      st,syscfg-m4-state = <&tamp 0x148 0xFFFFFFFF>;
141    };
142
143...
144