Add a device tree binding for the STM32 remote processor controlled via a TEE Trusted Application. Provide an example of the STM32MP15 Cortex-M4 core exposed as a child of the TEE remoteproc service (rproc-service-80a4c275-0a47-4905-8285-1486a9771a08) and managed by the remoteproc through a TEE client driver.
Signed-off-by: Arnaud Pouliquen arnaud.pouliquen@foss.st.com --- .../remoteproc/st,stm32-rproc-tee.yaml | 100 ++++++++++++++++++ 1 file changed, 100 insertions(+) create mode 100644 Documentation/devicetree/bindings/remoteproc/st,stm32-rproc-tee.yaml
diff --git a/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc-tee.yaml b/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc-tee.yaml new file mode 100644 index 000000000000..e9cf8e781543 --- /dev/null +++ b/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc-tee.yaml @@ -0,0 +1,100 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/remoteproc/st,stm32-rproc-tee.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: STMicroelectronics STM32 remote processor controlled via TEE + +maintainers: + - Arnaud Pouliquen arnaud.pouliquen@foss.st.com + +description: | + STM32MP remote processor controlled by a Trusted Application + running in OP-TEE. This node is a child of the TEE remoteproc service + (UUID 80a4c275-0a47-4905-8285-1486a9771a08) and exposes a remoteproc + instance managed by the Linux remoteproc core via the TEE rproc service. + + Firmware loading, authentication and remote processor start/stop are managed + by the TEE application. The STM32-specific driver handles platform resources + such as the mailboxes and reserved-memory. + +properties: + compatible: + const: st,stm32mp15-m4-tee + + reg: + description: | + Remote processor identifier used by the TEE service. The <0> value + in the example denotes a single instance with ID 0. + maxItems: 1 + + mboxes: + description: | + Mailbox channels used for rpmsg/virtio functionality and processor + shutdown. + maxItems: 3 + + mbox-names: + items: + - const: vq0 + - const: vq1 + - const: shutdown + + memory-region: + description: | + List of phandles to reserved-memory nodes describing the memory layout + for the interprocessors communication. + + interrupts: + description: | + Optional watchdog / status interrupt line used to detect crashes + and optionally wake up the system. + maxItems: 1 + + st,auto-boot: + type: boolean + description: | + If present, the remote processor will be automatically started by + the remoteproc core at boot. + + wakeup-source: + type: boolean + description: | + Indicates that the watchdog interrupt can be used as a wakeup source. + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + rproc_service: rproc-service@0 { + compatible = "rproc-service-80a4c275-0a47-4905-8285-1486a9771a08"; + reg = <0 0>; + #address-cells = <1>; + #size-cells = <0>; + status = "okay"; + + m4: m4@0 { + compatible = "st,stm32mp15-m4-tee"; + reg = <0>; + + mboxes = <&ipcc 0>, <&ipcc 1>, <&ipcc 2>; + mbox-names = "vq0", "vq1", "shutdown"; + + memory-region = <&vdev0vring0>, <&m_ipc_shm>, <&mcuram2>, + <&vdev0vring1>, <&vdev0buffer>, <&retram>; + + interrupt-parent = <&exti>; + interrupts = <68 1>; + + st,auto-boot; + wakeup-source; + + status = "okay"; + }; + }; +...