netdev - net: phy: realtek: Support external PHY clock

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Message-Id: <20230605151953.48539-1-detlev.casanova@collabora.com>
Date: Mon,  5 Jun 2023 11:19:50 -0400
From: Detlev Casanova <detlev.casanova@...labora.com>
To: linux-kernel@...r.kernel.org
Cc: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	netdev@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: net: phy: realtek: Support external PHY clock

Some PHYs can use an external clock that must be enabled before
communicating with them.

Changes since v2:
 * Reword documentation commit message

Changes since v1:
 * Remove the clock name as it is not guaranteed to be identical across
   different PHYs
 * Disable/Enable the clock when suspending/resuming