netdev - Re: [PATCH 2/4] dt-bindings: net: dsa: document internal MDIO bus

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Date: Sat, 9 Sep 2023 23:16:05 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Arınç ÜNAL <arinc.unal@...nc9.com>
Cc: Vladimir Oltean <olteanv@...il.com>,
	Florian Fainelli <f.fainelli@...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+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Woojung Huh <woojung.huh@...rochip.com>,
	UNGLinuxDriver@...rochip.com,
	Linus Walleij <linus.walleij@...aro.org>,
	Alvin Šipraga <alsi@...g-olufsen.dk>,
	Daniel Golle <daniel@...rotopia.org>,
	Landen Chao <Landen.Chao@...iatek.com>,
	DENG Qingfang <dqfext@...il.com>,
	Sean Wang <sean.wang@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	mithat.guner@...ont.com, erkin.bozoglu@...ont.com,
	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 2/4] dt-bindings: net: dsa: document internal MDIO bus

Please trim the text when replying.


> I'm writing below as a mix of patch log and discussion.
> 
> Phylink bindings are required for ports that are controlled by OF-based
> buses. DSA, like any other driver utilising the Linux MDIO infrastructure,
> can register a bus. If I understand correctly, non-OF-based registration of
> OpenFirmware MDIO buses is a feature specific to DSA which certain DSA
> subdrivers make use of.

This is not really DSA specific. Any MAC driver, or MDIO driver, can
call mdiobus_regsiter(), or of_mdiobus_register() and pass a NULL
pointer if there is no OF node available. It then requires that the
MAC driver uses an function like phy_find_first(), or knows via other
means what address the PHY uses on the bus. For DSA, that other means
is assuming a 1:1 mapping between port number and bus address.

   Andrew