netdev - Re: [PATCH net 3/4] docs: net: dsa: update user MDIO bus documentation

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Message-ID: <CACRpkdZ0LTg2TFD3_gDHPnM60zkzRycXiCFsD6S760FjLmbBqg@mail.gmail.com>
Date: Sat, 9 Dec 2023 22:49:19 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Vladimir Oltean <vladimir.oltean@....com>
Cc: Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>, 
	Luiz Angelo Daros de Luca <luizluca@...il.com>, Alvin ┼áipraga <alsi@...g-olufsen.dk>, 
	Madhuri Sripada <madhuri.sripada@...rochip.com>, Marcin Wojtas <mw@...ihalf.com>, 
	Tobias Waldekranz <tobias@...dekranz.com>, Arun Ramadoss <arun.ramadoss@...rochip.com>, 
	"Russell King (Oracle)" <rmk+kernel@...linux.org.uk>, Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH net 3/4] docs: net: dsa: update user MDIO bus documentation

On Sat, Dec 9, 2023 at 2:22 AM Vladimir Oltean <vladimir.oltean@....com> wrote:

> How about replacing it with this?
>
> Typically, the user MDIO bus accesses internal PHYs indirectly, by
> reading and writing to the MDIO controller registers located in the
> switch address space. Sometimes, especially if the switch is controlled
> over MDIO by the host, its internal PHYs may also be accessible on the
> same MDIO bus as the switch IP, but at a different MDIO address. In that
> case, a direct access method for the internal PHYs is to implement the
> MDIO access operations as diversions towards the parent MDIO bus of the
> switch, at different MDIO addresses.
>
> Conceivably, the direct access method could be extended to also target
> external PHYs situated on the same MDIO bus as the switch, or on a
> different MDIO bus entirely, referenced through ``platform_data``.

This is clear and simple to understand, go with it.
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij