linux-kernel - Re: [PATCH phy 13/14] dt-bindings: phy: lynx-28g: add compatible strings per SerDes and instantiation

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Message-ID: <20250905-bulky-umber-jaguarundi-1bf81c@kuoka>
Date: Fri, 5 Sep 2025 10:29:33 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Vladimir Oltean <vladimir.oltean@....com>
Cc: linux-phy@...ts.infradead.org, Ioana Ciornei <ioana.ciornei@....com>, 
	Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>, 
	linux-kernel@...r.kernel.org, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH phy 13/14] dt-bindings: phy: lynx-28g: add compatible
 strings per SerDes and instantiation

On Thu, Sep 04, 2025 at 06:44:01PM +0300, Vladimir Oltean wrote:
> Going by the generic "fsl,lynx-28g" compatible string and expecting all
> SerDes instantiations on all SoCs to use it was a mistake.
> 
> They all share the same register map, sure, but the number of protocol
> converters and lanes which are instantiated differs in a way that isn't
> detectable by software. So distinguish them by compatible strings.
> At the same time, keep "fsl,lynx-28g" as backup.
> 
> Cc: Rob Herring <robh@...nel.org>
> Cc: Krzysztof Kozlowski <krzk+dt@...nel.org>
> Cc: Conor Dooley <conor+dt@...nel.org>
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> ---
>  .../devicetree/bindings/phy/fsl,lynx-28g.yaml     | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/phy/fsl,lynx-28g.yaml b/Documentation/devicetree/bindings/phy/fsl,lynx-28g.yaml
> index ff9f9ca0f19c..55d773c8d0e4 100644
> --- a/Documentation/devicetree/bindings/phy/fsl,lynx-28g.yaml
> +++ b/Documentation/devicetree/bindings/phy/fsl,lynx-28g.yaml
> @@ -11,8 +11,17 @@ maintainers:
>  
>  properties:
>    compatible:
> -    enum:
> -      - fsl,lynx-28g
> +    oneOf:
> +      - items:
> +          - const: fsl,lynx-28g

Don't change that part. Previous enum was correct. You want oneOf and
enum.

> +      - items:
> +          - enum:
> +              - fsl,lx2160a-serdes1
> +              - fsl,lx2160a-serdes2
> +              - fsl,lx2160a-serdes3

What are the differences? number of lanes? For this you can take
num-lanes property.

> +              - fsl,lx2162a-serdes1
> +              - fsl,lx2162a-serdes2
> +          - const: fsl,lynx-28g

Best regards,
Krzysztof