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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Mon, 14 Aug 2023 15:09:25 +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

> Ah okay. I didn't consider the switch architecture where the data interface
> of the PHY is connected to the switch, and the PHY management interface is
> connected to the mdio bus that the switch is connected to.

The generic Linux architecture for PHYs and binding them to a MAC via
a phandle allows the PHY to be on any MDIO bus anywhere. DSA has some
additional shortcuts to support 1:1 mapping if the switch has its own
MDIO bus, without describing it in DT, but this is just in addition to
the generic code.

> Not json-schema documentation, don't care about:
> - ar9331.txt
> - lan9303.txt
> - lantiq-gswip.txt
> - marvell.txt

The marvell switch can have up to 2 MDIO busses. If i remember
correctly, there is also one switch which has one MDIO bus per port.

	   Andrew