linux-kernel - Re: net: dsa: Realtek switch drivers

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Message-ID: <CACRpkdbNevzCd-5n5ccgJ5HZpg0JEMd47a0PNiWPBr6r1mok6g@mail.gmail.com>
Date: Wed, 3 Jul 2024 09:59:50 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc: Andrew Lunn <andrew@...n.ch>, Luiz Angelo Daros de Luca <luizluca@...il.com>, 
	"alsi@...g-olufsen.dk" <alsi@...g-olufsen.dk>, Florian Fainelli <f.fainelli@...il.com>, 
	"olteanv@...il.com" <olteanv@...il.com>, Marek Behún <kabel@...nel.org>, 
	"ericwouds@...il.com" <ericwouds@...il.com>, David Miller <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, "kuba@...nel.org" <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	"justinstitt@...gle.com" <justinstitt@...gle.com>, 
	"rmk+kernel@...linux.org.uk" <rmk+kernel@...linux.org.uk>, netdev <netdev@...r.kernel.org>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	"sander@...nheule.net" <sander@...nheule.net>
Subject: Re: net: dsa: Realtek switch drivers

On Wed, Jul 3, 2024 at 4:39 AM Chris Packham
<chris.packham@...iedtelesis.co.nz> wrote:

> I've just found is that in theory the RTL930x
> supports a CPU disabled mode where you do connect it to an external CPU
> and the data travels over SGMII like you'd get with a traditional DSA
> design.

The Vitesse VSC73xx has this as well, it has an internal Intel 8051 (!)
CPU so the switch can be used stand-alone with a smallish PROM for
a random switchbox, or it can be used over SPI or memory-mapped from
another CPU as a DSA switch.

Yours,
Linus Walleij