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SubjectRe: [PATCH v2 2/8] dt-bindings: remoteproc: add bindings for stm32 remote processor driver
On Tue, Apr 16, 2019 at 04:58:13PM +0200, Fabien Dessenne wrote:
> Add the device tree bindings document for the stm32 remoteproc devices.
>
> Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
> ---
> .../devicetree/bindings/remoteproc/stm32-rproc.txt | 64 ++++++++++++++++++++++
> 1 file changed, 64 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
> new file mode 100644
> index 0000000..430132c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/remoteproc/stm32-rproc.txt
> @@ -0,0 +1,64 @@
> +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 remote processor dedicated memories.
> + The parent node should provide an appropriate ranges property
> + for properly translating these into bus addresses.

dma-ranges, but that's independent of 'reg'.

It needs to list how many reg regions and what they are.

> +- 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
> +- auto_boot: If defined, when remoteproc is probed, it loads the default
> + firmware and starts the remote processor.

st,auto-boot

> +
> +Example:
> + m4_rproc: m4@0 {
> + compatible = "st,stm32mp1-m4";
> + reg = <0x00000000 0x10000>,
> + <0x10000000 0x40000>,
> + <0x30000000 0x40000>;
> + resets = <&rcc MCU_R>;
> + st,syscfg-holdboot = <&rcc 0x10C 0x1>;
> + st,syscfg-tz = <&rcc 0x000 0x1>;
> + };
> --
> 2.7.4
>

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