linux-kernel - Re: [PATCH v2 1/2] dt-bindings: remoteproc: Add C906L rproc for Sophgo CV1800B SoC

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Message-ID: <jcpr5tg7jyyyqmaujegeuq5j3dqz4rrgxfz73rl55l3jibtq63@3w7bzux2b2je>
Date: Tue, 29 Jul 2025 16:31:01 +0800
From: Inochi Amaoto <inochiama@...il.com>
To: Junhui Liu <junhui.liu@...moral.tech>, 
	Bjorn Andersson <andersson@...nel.org>, Mathieu Poirier <mathieu.poirier@...aro.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Chen Wang <unicorn_wang@...look.com>, 
	Inochi Amaoto <inochiama@...il.com>, Philipp Zabel <p.zabel@...gutronix.de>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>
Cc: linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org, 
	sophgo@...ts.linux.dev, linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 1/2] dt-bindings: remoteproc: Add C906L rproc for
 Sophgo CV1800B SoC

On Mon, Jul 28, 2025 at 07:03:23PM +0800, Junhui Liu wrote:
> Add C906L remote processor for CV1800B SoC, which is an asymmetric
> processor typically running RTOS.
> 
> Signed-off-by: Junhui Liu <junhui.liu@...moral.tech>
> ---
>  .../bindings/remoteproc/sophgo,cv1800b-c906l.yaml  | 79 ++++++++++++++++++++++
>  1 file changed, 79 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/remoteproc/sophgo,cv1800b-c906l.yaml b/Documentation/devicetree/bindings/remoteproc/sophgo,cv1800b-c906l.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..2061c2fd6ba343c09b1a91700ea4a695d2b57f81
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/remoteproc/sophgo,cv1800b-c906l.yaml
> @@ -0,0 +1,79 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/remoteproc/sophgo,cv1800b-c906l.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Sophgo C906L remote processor controller for CV1800B SoC
> +
> +maintainers:
> +  - Junhui Liu <junhui.liu@...moral.tech>
> +
> +description:
> +  Document the bindings for the C906L remoteproc component that loads and boots
> +  firmwares on the CV1800B SoC.
> +
> +properties:
> +  compatible:
> +    const: sophgo,cv1800b-c906l
> +
> +  firmware-name:
> +    maxItems: 1
> +
> +  mbox-names:
> +    items:
> +      - const: tx
> +      - const: rx
> +
> +  mboxes:
> +    description:
> +      This property is required only if the rpmsg/virtio functionality is used.
> +      (see mailbox/sophgo,cv1800b-mailbox.yaml)
> +    items:
> +      - description: mailbox channel to send data to C906L
> +      - description: mailbox channel to receive data from C906L
> +
> +  memory-region:
> +    description:
> +      List of phandles to reserved memory regions used by the remote processor.
> +      The first region is required and provides the firmware region for the
> +      remote processor. The following regions (vdev buffer, vrings) are optional
> +      and are only required if rpmsg/virtio functionality is used.
> +    minItems: 1
> +    items:
> +      - description: firmware region
> +      - description: vdev buffer
> +      - description: vring0
> +      - description: vring1
> +    additionalItems: true
> +

Why not allocating these region dynamicly? I do not think firware is
always avaible before staring. Allowing dynamic firmware give us max
flexiblity.

Regards,
Inochi