net: phy: realtek: Support external PHY clock

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Subject: net: phy: realtek: Support external PHY clock
From: Detlev Casanova <detlev.casanova@xxxxxxxxxxxxx>
Date: Mon, 5 Jun 2023 11:19:50 -0400
Cc: Andrew Lunn <andrew@xxxxxxx>, Heiner Kallweit <hkallweit1@xxxxxxxxx>, Russell King <linux@xxxxxxxxxxxxxxx>, "David S . Miller" <davem@xxxxxxxxxxxxx>, Eric Dumazet <edumazet@xxxxxxxxxx>, Jakub Kicinski <kuba@xxxxxxxxxx>, Paolo Abeni <pabeni@xxxxxxxxxx>, Rob Herring <robh+dt@xxxxxxxxxx>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@xxxxxxxxxx>, Conor Dooley <conor+dt@xxxxxxxxxx>, Florian Fainelli <f.fainelli@xxxxxxxxx>, netdev@xxxxxxxxxxxxxxx, devicetree@xxxxxxxxxxxxxxx

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

Follow-Ups:
- Re: net: phy: realtek: Support external PHY clock
  - From: Jakub Kicinski
- [PATCH v3 3/3] net: phy: realtek: Disable clock on suspend
  - From: Detlev Casanova
- [PATCH v3 2/3] dt-bindings: net: phy: Document support for external PHY clk
  - From: Detlev Casanova
- [PATCH v3 1/3] net: phy: realtek: Add optional external PHY clock
  - From: Detlev Casanova

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