linux-kernel - Re: [PATCH net-next 6/9] net: dsa: vsc73xx: speed up mdio bus to max allowed value

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Message-ID: <CAJN1KkzJrMV8uDU+Z5xdLSd56uUwLtX+wo1w-8YbNgg-w8GiPA@mail.gmail.com>
Date: Tue, 30 Jul 2024 20:55:10 +0200
From: Paweł Dembicki <paweldembicki@...il.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: netdev@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>, 
	Vladimir Oltean <olteanv@...il.com>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Heiner Kallweit <hkallweit1@...il.com>, Russell King <linux@...linux.org.uk>, 
	Linus Walleij <linus.walleij@...aro.org>, 
	"Russell King (Oracle)" <rmk+kernel@...linux.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 6/9] net: dsa: vsc73xx: speed up mdio bus to max
 allowed value

wt., 30 lip 2024 o 01:10 Andrew Lunn <andrew@...n.ch> napisał(a):
>
> On Mon, Jul 29, 2024 at 11:06:12PM +0200, Pawel Dembicki wrote:
> > According the datasheet, vsc73xx family max internal mdio bus speed is
> > 20MHz. It also allow to disable preamble.
> >
> > This commit sets mdio clock prescaler to minimal value and crop preamble
> > to speed up mdio operations.
>
> Just checking...
>
> This has no effect on the external MDIO bus, correct. It has its own
> set of registers for the divider and to crop the preamble.

Yes. It's configured in a completely different subblock. Internal and
external mdio buses have symmetrical register set. It can be
configured separately.

-- 
Best regards,
Pawel Dembicki