Add the device tree bindings document for the stm32 remoteproc devices.
Signed-off-by: Fabien Dessenne <fabien.dessenne@xxxxxx>
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.../devicetree/bindings/remoteproc/stm32-rproc.txt | 67 ++++++++++++++++++++++
1 file changed, 67 insertions(+)
create mode 100644 Documentation/devicetree/bindings/remoteproc/stm32-rproc.txt
diff --git a/Documentation/devicetree/bindings/remoteproc/stm32-rproc.txt b/Documentation/devicetree/bindings/remoteproc/stm32-rproc.txt
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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-rproc"
+- reg: Address ranges of the remote processor dedicated memories.
+ The parent node should provide an appropriate ranges property
+ for properly translating these into bus addresses.
+- resets: Reference to a reset controller asserting the remote processor.
+- reset-names: Must be "mcu_rst"
+- 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:
+- interrupt-parent: phandle to the interrupt controller node.
+- interrupts: Should contain the watchdog interrupt
+- interrupt-names: Must be "wdg"
+- mboxes: 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.
+ Mono-directional 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
+ (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
+- auto_boot: If defined, when remoteproc is probed, it looks for a default
+ firmware and if it finds some, it loads the firmware and starts
+ the remote processor.
+- recovery: If defined, remoteproc enables the crash recovery process.
+
+Example:
+ m4_rproc: m4@0 {
+ compatible = "st,stm32mp1-rproc";
+ reg = <0x00000000 0x10000>,
+ <0x10000000 0x40000>,
+ <0x30000000 0x40000>;
+ resets = <&rcc MCU_R>;
+ reset-names = "mcu_rst";
+ st,syscfg-holdboot = <&rcc 0x10C 0x1>;
+ st,syscfg-tz = <&rcc 0x000 0x1>;
+ };
--
2.7.4
