142 lines
4.1 KiB
YAML
142 lines
4.1 KiB
YAML
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: "http://devicetree.org/schemas/remoteproc/st,stm32-rproc.yaml#"
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$schema: "http://devicetree.org/meta-schemas/core.yaml#"
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title: STMicroelectronics STM32 remote processor controller bindings
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description:
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This document defines the binding for the remoteproc component that loads and
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boots firmwares on the ST32MP family chipset.
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maintainers:
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- Fabien Dessenne <fabien.dessenne@st.com>
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- Arnaud Pouliquen <arnaud.pouliquen@st.com>
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properties:
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compatible:
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const: st,stm32mp1-m4
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reg:
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description:
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Address ranges of the RETRAM and MCU SRAM memories used by the remote
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processor.
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maxItems: 3
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resets:
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maxItems: 1
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st,syscfg-holdboot:
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description: remote processor reset hold boot
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- Phandle of syscon block.
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- The offset of the hold boot setting register.
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- The field mask of the hold boot.
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$ref: "/schemas/types.yaml#/definitions/phandle-array"
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maxItems: 1
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st,syscfg-tz:
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description:
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Reference to the system configuration which holds the RCC trust zone mode
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$ref: "/schemas/types.yaml#/definitions/phandle-array"
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maxItems: 1
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interrupts:
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description: Should contain the WWDG1 watchdog reset interrupt
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maxItems: 1
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wakeup-source: true
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mboxes:
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description:
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This property is required only if the rpmsg/virtio functionality is used.
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items:
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- description: |
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A channel (a) used to communicate through virtqueues with the
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remote proc.
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Bi-directional channel:
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- from local to remote = send message
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- from remote to local = send message ack
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- description: |
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A channel (b) working the opposite direction of channel (a)
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- description: |
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A channel (c) used by the local proc to notify the remote proc that it
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is about to be shut down.
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Unidirectional channel:
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- from local to remote, where ACK from the remote means that it is
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ready for shutdown
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- description: |
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A channel (d) used by the local proc to notify the remote proc that it
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has to stop interprocessor communnication.
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Unidirectional channel:
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- from local to remote, where ACK from the remote means that communnication
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as been stopped on the remote side.
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minItems: 1
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mbox-names:
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items:
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- const: vq0
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- const: vq1
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- const: shutdown
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- const: detach
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minItems: 1
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memory-region:
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description:
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List of phandles to the reserved memory regions associated with the
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remoteproc device. This is variable and describes the memories shared with
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the remote processor (e.g. remoteproc firmware and carveouts, rpmsg
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vrings, ...).
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(see ../reserved-memory/reserved-memory.txt)
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st,syscfg-pdds:
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$ref: "/schemas/types.yaml#/definitions/phandle-array"
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description: |
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Reference to the system configuration which holds the remote
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maxItems: 1
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st,syscfg-m4-state:
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$ref: "/schemas/types.yaml#/definitions/phandle-array"
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description: |
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Reference to the tamp register which exposes the Cortex-M4 state.
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maxItems: 1
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st,syscfg-rsc-tbl:
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$ref: "/schemas/types.yaml#/definitions/phandle-array"
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description: |
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Reference to the tamp register which references the Cortex-M4
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resource table address.
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maxItems: 1
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st,auto-boot:
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$ref: /schemas/types.yaml#/definitions/flag
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description:
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If defined, when remoteproc is probed, it loads the default firmware and
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starts the remote processor.
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required:
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- compatible
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- reg
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- resets
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- st,syscfg-holdboot
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- st,syscfg-tz
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/reset/stm32mp1-resets.h>
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m4_rproc: m4@10000000 {
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compatible = "st,stm32mp1-m4";
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reg = <0x10000000 0x40000>,
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<0x30000000 0x40000>,
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<0x38000000 0x10000>;
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resets = <&rcc MCU_R>;
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st,syscfg-holdboot = <&rcc 0x10C 0x1>;
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st,syscfg-tz = <&rcc 0x000 0x1>;
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st,syscfg-rsc-tbl = <&tamp 0x144 0xFFFFFFFF>;
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st,syscfg-m4-state = <&tamp 0x148 0xFFFFFFFF>;
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};
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...
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