# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) %YAML 1.2 --- $id: http://devicetree.org/schemas/remoteproc/st,stm32-rproc.yaml# $schema: http://devicetree.org/meta-schemas/core.yaml# title: STMicroelectronics STM32 remote processor controller description: This document defines the binding for the remoteproc component that loads and boots firmwares on the ST32MP family chipset. maintainers: - Fabien Dessenne - Arnaud Pouliquen properties: compatible: const: st,stm32mp1-m4 reg: description: Address ranges of the RETRAM and MCU SRAM memories used by the remote processor. maxItems: 3 resets: minItems: 1 maxItems: 2 reset-names: items: - const: mcu_rst - const: hold_boot minItems: 1 st,syscfg-holdboot: description: remote processor reset hold boot $ref: /schemas/types.yaml#/definitions/phandle-array items: - items: - description: Phandle of syscon block - description: The offset of the hold boot setting register - description: The field mask of the hold boot st,syscfg-tz: deprecated: true description: Reference to the system configuration which holds the RCC trust zone mode $ref: /schemas/types.yaml#/definitions/phandle-array items: - items: - description: Phandle of syscon block - description: The offset of the trust zone setting register - description: The field mask of the trust zone state interrupts: description: Should contain the WWDG1 watchdog reset interrupt maxItems: 1 wakeup-source: true mboxes: description: This property is required only if the rpmsg/virtio functionality is used. items: - description: | A channel (a) used to communicate through virtqueues with the remote proc. Bi-directional channel: - from local to remote = send message - from remote to local = send message ack - description: | A channel (b) working the opposite direction of channel (a) - description: | A channel (c) used by the local proc to notify the remote proc that it is about to be shut down. Unidirectional channel: - from local to remote, where ACK from the remote means that it is ready for shutdown - description: | A channel (d) used by the local proc to notify the remote proc that it has to stop interprocessor communication. Unidirectional channel: - from local to remote, where ACK from the remote means that communication as been stopped on the remote side. minItems: 1 mbox-names: items: - const: vq0 - const: vq1 - const: shutdown - const: detach minItems: 1 memory-region: description: List of phandles to the reserved memory regions associated with the remoteproc device. This is variable and describes the memories shared with the remote processor (e.g. remoteproc firmware and carveouts, rpmsg vrings, ...). (see ../reserved-memory/reserved-memory.txt) st,syscfg-pdds: $ref: /schemas/types.yaml#/definitions/phandle-array description: | Reference to the system configuration which holds the remote items: - items: - description: Phandle of syscon block - description: The offset of the power setting register - description: The field mask of the PDDS selection st,syscfg-m4-state: $ref: /schemas/types.yaml#/definitions/phandle-array description: | Reference to the tamp register which exposes the Cortex-M4 state. items: - items: - description: Phandle of syscon block with the tamp register - description: The offset of the tamp register - description: The field mask of the Cortex-M4 state st,syscfg-rsc-tbl: $ref: /schemas/types.yaml#/definitions/phandle-array description: | Reference to the tamp register which references the Cortex-M4 resource table address. items: - items: - description: Phandle of syscon block with the tamp register - description: The offset of the tamp register - description: The field mask of the Cortex-M4 resource table address st,auto-boot: $ref: /schemas/types.yaml#/definitions/flag description: If defined, when remoteproc is probed, it loads the default firmware and starts the remote processor. required: - compatible - reg - resets allOf: - if: properties: reset-names: not: contains: const: hold_boot then: required: - st,syscfg-holdboot else: properties: st,syscfg-holdboot: false additionalProperties: false examples: - | #include m4@10000000 { compatible = "st,stm32mp1-m4"; reg = <0x10000000 0x40000>, <0x30000000 0x40000>, <0x38000000 0x10000>; resets = <&rcc MCU_R>; reset-names = "mcu_rst"; /* Hold boot managed using system config*/ st,syscfg-holdboot = <&rcc 0x10C 0x1>; st,syscfg-rsc-tbl = <&tamp 0x144 0xFFFFFFFF>; st,syscfg-m4-state = <&tamp 0x148 0xFFFFFFFF>; }; - | #include m4@10000000 { compatible = "st,stm32mp1-m4"; reg = <0x10000000 0x40000>, <0x30000000 0x40000>, <0x38000000 0x10000>; /* Hold boot managed using SCMI reset controller */ resets = <&scmi MCU_R>, <&scmi MCU_HOLD_BOOT_R>; reset-names = "mcu_rst", "hold_boot"; st,syscfg-rsc-tbl = <&tamp 0x144 0xFFFFFFFF>; st,syscfg-m4-state = <&tamp 0x148 0xFFFFFFFF>; }; ...