[PATCH] dt-bindings: riscv: firmware: Add OpenSBI configuration binding

[Conor Dooley]

On Wed, Aug 19, 2026 at 05:04:11PM +0800, Yaxing Guo wrote:
> From: yangyinglu <yangyinglu at bosc.cn>
> 
> Add a Devicetree binding for OpenSBI configuration data in the
> chosen node, including the cold-boot-harts property.
> 
> OpenSBI supports describing certain Generic Platform configurations in
> the device tree passed by the previous boot stage. The OpenSBI source
> tree documents the `opensbi,config` node and provides the corresponding
> device tree parsing flow.
> 
> The `/chosen/opensbi-config` node can be used to configure OpenSBI,
> including the set of harts permitted to perform a cold boot through the
> `cold-boot-harts` property. OpenSBI parses this node during the boot
> phase and removes it from the device tree after cold boot.
> 
> Add the Devicetree binding for this OpenSBI configuration node to
> document the supported `compatible` and `cold-boot-harts` properties.
> 
> Signed-off-by: yangyinglu <yangyinglu at bosc.cn>
> ---
>  .../bindings/firmware/opensbi,config.yaml     | 38 +++++++++++++++++++
>  1 file changed, 38 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/firmware/opensbi,config.yaml
> 
> diff --git a/Documentation/devicetree/bindings/firmware/opensbi,config.yaml b/Documentation/devicetree/bindings/firmware/opensbi,config.yaml
> new file mode 100644
> index 000000000000..86b1e1e673a8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/firmware/opensbi,config.yaml
> @@ -0,0 +1,38 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/firmware/opensbi,config.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: OpenSBI Firmware Configuration
> +
> +maintainers:

You probably should've waited for a response to your question about who
should maintain it before sending, becuase I am not entirely sure this
software configuration node should be documented or if the maintainers
of opensbi would want it to be.

Cheers,
Conor.

> +
> +description: |
> +  OpenSBI configuration data passed in the chosen node.
> +
> +properties:
> +  compatible:
> +    const: opensbi,config
> +
> +  cold-boot-harts:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    description:
> +      List of hart CPU nodes selected as cold boot harts by OpenSBI.
> +
> +required:
> +  - compatible
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    / {
> +        chosen {
> +            opensbi-config {
> +                compatible = "opensbi,config";
> +                cold-boot-harts = <&cpu0>;
> +            };
> +        };
> +    };
> +...
> -- 
> 2.43.0
> 
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