77 lines
3.4 KiB
Plaintext
77 lines
3.4 KiB
Plaintext
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STMicroelectronics STM32 Remoteproc
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-----------------------------------
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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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Required properties:
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- compatible: Must be "st,stm32mp1-m4"
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- reg: Address ranges of the RETRAM and MCU SRAM memories used by the
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remote processor.
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- resets: Reference to a reset controller asserting the remote processor.
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- st,syscfg-holdboot: Reference to the system configuration which holds the
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remote processor reset hold boot
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1st cell: phandle of syscon block
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2nd cell: register offset containing the hold boot setting
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3rd cell: register bitmask for the hold boot field
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- st,syscfg-tz: Reference to the system configuration which holds the RCC trust
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zone mode
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1st cell: phandle to syscon block
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2nd cell: register offset containing the RCC trust zone mode setting
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3rd cell: register bitmask for the RCC trust zone mode bit
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Optional properties:
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- interrupts: Should contain the watchdog interrupt
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- wakeup-source: Flag indicating whether remoteproc can wake up the system by
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the watchdog interrupt. Only meaningful if the "interrupts"
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property is defined.
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- mboxes: This property is required only if the rpmsg/virtio functionality
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is used. List of phandle and mailbox channel specifiers:
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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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- a channel (b) working the opposite direction of channel (a)
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- a channel (c) used by the local proc to notify the remote proc
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that it 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
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that it is ready for shutdown
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- mbox-names: This property is required if the mboxes property is used.
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- must be "vq0" for channel (a)
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- must be "vq1" for channel (b)
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- must be "shutdown" for channel (c)
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- memory-region: List of phandles to the reserved memory regions associated with
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the remoteproc device. This is variable and describes the
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memories shared with the remote processor (eg: remoteproc
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firmware and carveouts, rpmsg vrings, ...).
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(see ../reserved-memory/reserved-memory.txt)
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- st,syscfg-pdds: Reference to the system configuration which holds the remote
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processor deep sleep setting
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1st cell: phandle to syscon block
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2nd cell: register offset containing the deep sleep setting
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3rd cell: register bitmask for the deep sleep bit
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- st,syscfg-rsc-tbl: Reference to the system configuration controlling the
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resource table address loaded by the bootloader
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1st cell: phandle to syscon block
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2nd cell: register offset containing the resource table address
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3rd cell: register bitmask for the resource table address
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- st,syscfg-copro-state: Reference to the system configuration which returns the
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coprocessor state.
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1st cell: phandle to syscon block
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2nd cell: register offset containing the coprocessor state
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3rd cell: register bitmask for the coprocessor state
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- st,auto-boot: If defined, when remoteproc is probed, it loads the default
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firmware and starts the remote processor.
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Example:
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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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};
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