linux-kernel - Re: [PATCH 1/7] dt-bindings: Add support for export-symbols node

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Message-ID: <20241209182722.2dd15f7a@booty>
Date: Mon, 9 Dec 2024 18:27:22 +0100
From: Luca Ceresoli <luca.ceresoli@...tlin.com>
To: Herve Codina <herve.codina@...tlin.com>
Cc: Andrew Davis <afd@...com>, Ayush Singh <ayush@...gleboard.org>, Geert
 Uytterhoeven <geert@...ux-m68k.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Arnd Bergmann <arnd@...db.de>, Greg Kroah-Hartman
 <gregkh@...uxfoundation.org>, Saravana Kannan <saravanak@...gle.com>,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, Thomas Petazzoni
 <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 1/7] dt-bindings: Add support for export-symbols node

Hi Hervé,

On Mon,  9 Dec 2024 16:18:19 +0100
Herve Codina <herve.codina@...tlin.com> wrote:

> An export-symbols node allows to export symbols for symbols resolution
> performed when applying a device tree overlay.
> 
> When a device tree overlay is applied on a node having an export-symbols
> node, symbols listed in the export-symbols node are used to resolve
> undefined symbols referenced from the overlay.
> 
> This allows:
>   - Referencing symbols from an device tree overlay without the need to
>     know the full base board. Only the connector definition is needed.
> 
>   - Using the exact same overlay on several connectors available on a given
>     board.
> 
> For instance, the following description is supported with the
> export-symbols node:
>  - Base device tree board A:
>     ...
>     foo_connector: connector1 {
>         export-symbols {
>            connector = <&foo_connector>;
>         };
>     };
> 
>     bar_connector: connector2 {
>         export-symbols {
>            connector = <&bar_connector>;
>         };
>     };
>     ...
> 
>  - Base device tree board B:
>     ...
>     front_connector: addon-connector {
>         export-symbols {
>            connector = <&front_connector>;
>         };
>     };
>     ...
> 
>  - Overlay describing an addon board the can be connected on connectors:
>     ...
>     node {
>         ...
>         connector = <&connector>;
>         ...
>     };
>     ...
> 
> Thanks to the export-symbols node, the overlay can be applied on
> connector1 or connector2 available on board A but also on
> addon-connector available on board B.
> 
> Signed-off-by: Herve Codina <herve.codina@...tlin.com>
> ---
>  .../devicetree/bindings/export-symbols.yaml   | 43 +++++++++++++++++++
>  1 file changed, 43 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/export-symbols.yaml
> 
> diff --git a/Documentation/devicetree/bindings/export-symbols.yaml b/Documentation/devicetree/bindings/export-symbols.yaml
> new file mode 100644
> index 000000000000..0e404eff8937
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/export-symbols.yaml
> @@ -0,0 +1,43 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/export-symbols.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Export symbols
> +
> +maintainers:
> +  - Herve Codina <herve.codina@...tlin.com>
> +
> +description: |
> +  An export-symbols node allows to export symbols for symbols resolution
> +  performed when applying a device tree overlay.
> +
> +  When a device tree overlay is applied on a node having an export-symbols
> +  node, symbols listed in the export-symbols node are used to resolve undefined
> +  symbols referenced from the overlay.
> +
> +properties:
> +  $nodename:
> +    const: export-symbols
> +
> +patternProperties:
> +  "^[a-zA-Z_]?[a-zA-Z0-9_]*$":

I think the '?' should not be there: "^[a-zA-Z_][a-zA-Z0-9_]*$".

Otherwise LGTM.

Luca

-- 
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com