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STMicroelectronics STM32 Remoteproc
-----------------------------------
This document defines the binding for the remoteproc component that loads and
boots firmwares on the ST32MP family chipset.
Required properties:
- compatible: Must be "st,stm32mp1-m4"
- reg: Address ranges of the RETRAM and MCU SRAM memories used by the
remote processor.
- resets: Reference to a reset controller asserting the remote processor.
- st,syscfg-holdboot: Reference to the system configuration which holds the
remote processor reset hold boot
1st cell: phandle of syscon block
2nd cell: register offset containing the hold boot setting
3rd cell: register bitmask for the hold boot field
- st,syscfg-tz: Reference to the system configuration which holds the RCC trust
zone mode
1st cell: phandle to syscon block
2nd cell: register offset containing the RCC trust zone mode setting
3rd cell: register bitmask for the RCC trust zone mode bit
Optional properties:
- interrupts: Should contain the watchdog interrupt
- mboxes: This property is required only if the rpmsg/virtio functionality
is used. List of phandle and mailbox channel specifiers:
- 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
- a channel (b) working the opposite direction of channel (a)
- 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
- mbox-names: This property is required if the mboxes property is used.
- must be "vq0" for channel (a)
- must be "vq1" for channel (b)
- must be "shutdown" for channel (c)
- memory-region: 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 (eg: remoteproc
firmware and carveouts, rpmsg vrings, ...).
(see ../reserved-memory/reserved-memory.txt)
- st,syscfg-pdds: Reference to the system configuration which holds the remote
processor deep sleep setting
1st cell: phandle to syscon block
2nd cell: register offset containing the deep sleep setting
3rd cell: register bitmask for the deep sleep bit
- st,auto-boot: If defined, when remoteproc is probed, it loads the default
firmware and starts the remote processor.
Example:
m4_rproc: m4@10000000 {
compatible = "st,stm32mp1-m4";
reg = <0x10000000 0x40000>,
<0x30000000 0x40000>,
<0x38000000 0x10000>;
resets = <&rcc MCU_R>;
st,syscfg-holdboot = <&rcc 0x10C 0x1>;
st,syscfg-tz = <&rcc 0x000 0x1>;
};
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