netdev - Re: [PATCH net-next 2/2] net: phy: aquantia: allow forcing order of MDI pairs

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Message-ID: <a59be297-1a55-4cce-a3e1-7568e3d4e66c@lunn.ch>
Date: Wed, 21 Aug 2024 18:07:06 +0200
From: Andrew Lunn <andrew@...n.ch>
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>,
	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 2/2] net: phy: aquantia: allow forcing order of
 MDI pairs

On Wed, Aug 21, 2024 at 01:46:50PM +0100, Daniel Golle wrote:
> Normally, the MDI reversal configuration is taken from the MDI_CFG pin.
> However, some hardware designs require overriding the value configured
> by that bootstrap pin. The PHY allows doing that by setting a bit which
> allows ignoring the state of the MDI_CFG pin and configuring whether
> the order of MDI pairs should be normal (ABCD) or reverse (DCBA).
> 
> Introduce two boolean properties which allow forcing either normal or
> reverse order of the MDI pairs from DT.

How does this interact with ethtool -s eth42 [mdix auto|on|off]

In general, you want mdix auto, so the two ends figure out how the
cable is wired and so it just works.

      Andrew