linux-kernel - Re: [PATCH net-next v2 00/10] define and enforce phylink bindings

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Message-ID: <29cd6190-a565-4f95-9de0-41ed7c7772e6@lunn.ch>
Date:   Sun, 24 Sep 2023 16:55:05 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Arınç ÜNAL <arinc.unal@...nc9.com>
Cc:     "Russell King (Oracle)" <linux@...linux.org.uk>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
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Subject: Re: [PATCH net-next v2 00/10] define and enforce phylink bindings

On Sun, Sep 24, 2023 at 10:49:49AM +0300, Arınç ÜNAL wrote:
> On 24/09/2023 06:15, Andrew Lunn wrote:
> > > > There is a MAC driver currently under review which does not have a PHY
> > > > at all. The MAC is directly connected to a switch, all within one
> > > > IC. The link is always running at 5Gbps, the link is always up. It is
> > > > physically impossible to connect a PHY, so get_link_settings just
> > > > returns hard coded values.
> > > 
> > > The fixed-link property would be used to describe the link of the MAC here.
> > 
> > Fixed-link make sense for a general purpose MAC which could be
> > connected to a PHY, or could also be used without a PHY. fixed-link
> > simplifies the code in that the MAC driver does not see a difference,
> > it all looks like a PHY.
> > 
> > However for a MAC which cannot be connected to a PHY, there is no need
> > to emulate a PHY. The MAC driver will be simpler. So i would not
> > recommend a fixed-link in this situation.
> 
> There's a link, it must be described.

Why must it be described?

Lets take this to the extreme to make a point. The chip has a ground
pin. Must i describe that?

     Andrew