linux-kernel - Re: [PATCH net-next v3 1/2] dt-bindings: net: ethernet-phy: Add timing-role role property for ethernet PHYs

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Message-ID: <ZulHp9IBvptenuRa@shell.armlinux.org.uk>
Date: Tue, 17 Sep 2024 10:11:03 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Oleksij Rempel <o.rempel@...gutronix.de>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	"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>,
	Florian Fainelli <f.fainelli@...il.com>, kernel@...gutronix.de,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH net-next v3 1/2] dt-bindings: net: ethernet-phy: Add
 timing-role role property for ethernet PHYs

On Fri, Sep 13, 2024 at 10:40:21AM +0200, Oleksij Rempel wrote:
> This patch introduces a new `timing-role` property in the device tree
> bindings for configuring the master/slave role of PHYs. This is
> essential for scenarios where hardware strap pins are unavailable or
> incorrectly configured.
> 
> The `timing-role` property supports the following values:
> - `force-master`: Forces the PHY to operate as a master (clock source).
> - `force-slave`: Forces the PHY to operate as a slave (clock receiver).
> - `prefer-master`: Prefers the PHY to be master but allows negotiation.
> - `prefer-slave`: Prefers the PHY to be slave but allows negotiation.
> 
> The terms "master" and "slave" are retained in this context to align
> with the IEEE 802.3 standards, where they are used to describe the roles
> of PHY devices in managing clock signals for data transmission. In
> particular, the terms are used in specifications for 1000Base-T and
> MultiGBASE-T PHYs, among others. Although there is an effort to adopt
> more inclusive terminology, replacing these terms could create
> discrepancies between the Linux kernel and the established standards,
> documentation, and existing hardware interfaces.

Does this provide the boot-time default that userspace is subsequently
allowed to change through ethtool, or does it provide a fixed
configuration?

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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