linux-kernel - Re: [PATCH v2 2/8] dt-bindings: remoteproc: add bindings for stm32 remote processor driver

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Date:   Mon, 29 Apr 2019 19:40:51 -0500
From:   Rob Herring <robh@...nel.org>
To:     Fabien Dessenne <fabien.dessenne@...com>
Cc:     Mark Rutland <mark.rutland@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-remoteproc@...r.kernel.org,
        Loic Pallardy <loic.pallardy@...com>,
        Arnaud Pouliquen <arnaud.pouliquen@...com>,
        Ludovic Barre <ludovic.barre@...com>,
        Benjamin Gaignard <benjamin.gaignard@...com>
Subject: Re: [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@...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
>