linux-kernel - Re: [net-next RFC PATCH 2/2] net: mdio: Add MDIO bus controller for Airoha AN7583

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Message-ID: <68363f34.050a0220.351f97.06f7@mx.google.com>
Date: Wed, 28 May 2025 00:39:45 +0200
From: Christian Marangi <ansuelsmth@...il.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Philipp Zabel <p.zabel@...gutronix.de>, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next RFC PATCH 2/2] net: mdio: Add MDIO bus controller for
 Airoha AN7583

On Wed, May 28, 2025 at 12:36:46AM +0200, Andrew Lunn wrote:
> > +#define AN7583_MDIO_PHY				0xd4
> > +#define   AN7583_MDIO1_SPEED_MODE		BIT(11)
> > +#define   AN7583_MDIO0_SPEED_MODE		BIT(10)
> 
> Is there any documentation about what these bits do? The bus should
> default to 2.5Mhz.
>

No but I can ask. In theory tho these MDIO controller are used for 10g
or 2.5g PHY that all require a firmware to load so 2.5MHz makes the boot
time of 2+ minute.

The documentation say...

1: fast mode
0: normal mode

Very useful I guess :D

-- 
	Ansuel