linux-kernel - Re: [PATCH net-next v2 02/13] net: phy: sfp: handle non-wired SFP connectors

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Date:   Fri, 4 May 2018 10:04:48 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Antoine Tenart <antoine.tenart@...tlin.com>, davem@...emloft.net,
        kishon@...com, linux@...linux.org.uk, gregory.clement@...tlin.com,
        andrew@...n.ch, jason@...edaemon.net,
        sebastian.hesselbarth@...il.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        thomas.petazzoni@...tlin.com, maxime.chevallier@...tlin.com,
        miquel.raynal@...tlin.com, nadavh@...vell.com, stefanc@...vell.com,
        ymarkman@...vell.com, mw@...ihalf.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next v2 02/13] net: phy: sfp: handle non-wired SFP
 connectors

On 05/04/2018 06:56 AM, Antoine Tenart wrote:
> SFP connectors can be solder on a board without having any of their pins
> (LOS, i2c...) wired. In such cases the SFP link state cannot be guessed,
> and the overall link status reporting is left to other layers.
> 
> In order to achieve this, a new SFP_DEV status is added, named UNKNOWN.
> This mode is set when it is not possible for the SFP code to get the
> link status and as a result the link status is reported to be always UP
> from the SFP point of view.

Why represent the SFP in Device Tree then? Why not just declare this is
a fixed link which would avoid having to introduce this "unknown" state.
-- 
Florian