linux-kernel - Re: [PATCH net-next v2 1/2] dt-bindings: net: marvell,aquantia: add properties to override MDI

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Message-ID: <20240829195314.GA916906-robh@kernel.org>
Date: Thu, 29 Aug 2024 14:53:14 -0500
From: Rob Herring <robh@...nel.org>
To: Daniel Golle <daniel@...rotopia.org>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Christian Marangi <ansuelsmth@...il.com>,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	Robert Marko <robimarko@...il.com>,
	Russell King <rmk+kernel@...linux.org.uk>, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 1/2] dt-bindings: net: marvell,aquantia: add
 properties to override MDI_CFG

On Wed, Aug 28, 2024 at 11:51:49PM +0100, Daniel Golle wrote:
> Usually the MDI pair order reversal configuration is defined by
> bootstrap pin MDI_CFG. Some designs, however, require overriding the MDI
> pair order and force either normal or reverse order.
> 
> Add mutually exclusive properties 'marvell,force-mdi-order-normal' and
> 'marvell,force-mdi-order-reverse' for that purpose.
> 
> Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> ---
> v2: enforce mutually exclusive relationship of the two new properties in
>     dt-schema.
> 
>  .../bindings/net/marvell,aquantia.yaml           | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/marvell,aquantia.yaml b/Documentation/devicetree/bindings/net/marvell,aquantia.yaml
> index 9854fab4c4db0..03b0cff239f70 100644
> --- a/Documentation/devicetree/bindings/net/marvell,aquantia.yaml
> +++ b/Documentation/devicetree/bindings/net/marvell,aquantia.yaml
> @@ -22,6 +22,12 @@ description: |
>  
>  allOf:
>    - $ref: ethernet-phy.yaml#
> +  - if:
> +      required:
> +        - marvell,force-mdi-order-normal
> +    then:
> +      properties:
> +        marvell,force-mdi-order-reverse: false
>  
>  select:
>    properties:
> @@ -48,6 +54,16 @@ properties:
>    firmware-name:
>      description: specify the name of PHY firmware to load
>  
> +  marvell,force-mdi-order-normal:
> +    type: boolean
> +    description:
> +      force normal order of MDI pairs, overriding MDI_CFG bootstrap pin.
> +
> +  marvell,force-mdi-order-reverse:
> +    type: boolean
> +    description:
> +      force reverse order of MDI pairs, overriding MDI_CFG bootstrap pin.

Why 2 properties for 1 setting? Just do something like this:

marvell,mdi-cfg-order = <0|1>;

1 means reverse, 0 means normal (or vise-versa). Not present then means 
use MDI_CFG setting. Then the binding naturally avoids nonsensical 
combinations of properties without the schema having to enforce it.

Feel free to tweak the naming/values. I would make 0 and 1 align with 
MDI_CFG states, but I don't know what those are.

Rob