linux-kernel - Re: [PATCH net-next 1/4] dt-bindings: net: dsa: microchip: add SGMII port support to KSZ9477 switch

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Message-ID: <eae7d246-49c3-486e-bc62-cdb49d6b1d72@lunn.ch>
Date: Sat, 10 Aug 2024 19:26:16 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Tristram.Ha@...rochip.com
Cc: Woojung Huh <woojung.huh@...rochip.com>, UNGLinuxDriver@...rochip.com,
	devicetree@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>,
	Vladimir Oltean <olteanv@...il.com>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Marek Vasut <marex@...x.de>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/4] dt-bindings: net: dsa: microchip: add SGMII
 port support to KSZ9477 switch

On Fri, Aug 09, 2024 at 04:38:37PM -0700, Tristram.Ha@...rochip.com wrote:
> From: Tristram Ha <tristram.ha@...rochip.com>
> 
> The SGMII module of KSZ9477 switch can be setup in 3 ways: 0 for direct
> connect, 1 for 1000BaseT SFP, and 2 for 10/100/1000 SFP.
> 
> SFP is typically used so the default is 1.  The driver can detect
> 10/100/1000 SFP and change the mode to 2.  For direct connect this mode
> has to be explicitly set to 0 as driver cannot detect that
> configuration.

Could you explain this in more detail. Other SGMII blocks don't need
this. Why is this block special?

Has this anything to do with in-band signalling?

    Andrew