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

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Message-ID: <20240821-unbalance-postage-8d232da0ed18@spud>
Date: Wed, 21 Aug 2024 16:51:30 +0100
From: Conor Dooley <conor@...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>,
	Rob Herring <robh@...nel.org>,
	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>,
	Chad Monroe <chad.monroe@...ran.com>,
	John Crispin <john@...ozen.org>, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/2] dt-bindings: net: marvell,aquantia: add
 properties to override MDI_CFG

On Wed, Aug 21, 2024 at 01:46:30PM +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.

Is that a PC way of saying that someone messed up and wired the pins
incorrectly? A concrete example of why this is required would be good ;)

> 
> Add properties 'marvell,force-mdi-order-normal' and
> 'marvell,force-mdi-order-reverse' for that purpose.
> 
> Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> ---
>  .../devicetree/bindings/net/marvell,aquantia.yaml      | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/marvell,aquantia.yaml b/Documentation/devicetree/bindings/net/marvell,aquantia.yaml
> index 9854fab4c4db0..c82d0be48741d 100644
> --- a/Documentation/devicetree/bindings/net/marvell,aquantia.yaml
> +++ b/Documentation/devicetree/bindings/net/marvell,aquantia.yaml
> @@ -48,6 +48,16 @@ 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.

These properties are mutually exclusive, right? If so, the binding
should enforce that.

Thanks,
Conor.

> +
>    nvmem-cells:
>      description: phandle to the firmware nvmem cell
>      maxItems: 1
> -- 
> 2.46.0

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