Re: [PATCH v2 3/4] dt-bindings: drm/bridge: ti-sn65dsi83: Add vcc supply bindings

[Maxime Ripard <maxime@cerno.tech>]

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Hi,

On Tue, Oct 12, 2021 at 08:48:42AM +0200, Alexander Stein wrote:
> Add a VCC regulator which needs to be enabled before the EN pin is
> released.
> 
> Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
> Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> ---
>  .../devicetree/bindings/display/bridge/ti,sn65dsi83.yaml     | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi83.yaml b/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi83.yaml
> index a5779bf17849..49ace6f312d5 100644
> --- a/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi83.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi83.yaml
> @@ -32,6 +32,9 @@ properties:
>      maxItems: 1
>      description: GPIO specifier for bridge_en pin (active high).
>  
> +  vcc-supply:
> +    description: A 1.8V power supply (see regulator/regulator.yaml).
> +
>    ports:
>      $ref: /schemas/graph.yaml#/properties/ports
>  
> @@ -93,6 +96,7 @@ properties:
>  required:
>    - compatible
>    - reg
> +  - vcc-supply

This isn't a backward-compatible change. All the previous users of that
binding will now require a vcc-supply property even though it was
working fine for them before.

You handle that nicely in the code, but you can't make that new property
required.

Maxime

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