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

[Andrew Lunn]

On Fri, Aug 09, 2024 at 04:38:37PM -0700, Tristram.Ha@xxxxxxxxxxxxx wrote:
> From: Tristram Ha <tristram.ha@xxxxxxxxxxxxx>
> 
> 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