linux-kernel - Re: [PATCH net-next v2 03/13] net: phy: sfp: warn the user when no tx

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Message-ID: <20180504171425.GA17233@lunn.ch>
Date:   Fri, 4 May 2018 19:14:25 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Antoine Tenart <antoine.tenart@...tlin.com>, davem@...emloft.net,
        kishon@...com, linux@...linux.org.uk, gregory.clement@...tlin.com,
        jason@...edaemon.net, sebastian.hesselbarth@...il.com,
        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 03/13] net: phy: sfp: warn the user when no
 tx_disable pin is available

On Fri, May 04, 2018 at 10:07:53AM -0700, Florian Fainelli wrote:
> On 05/04/2018 06:56 AM, Antoine Tenart wrote:
> > In case no Tx disable pin is available the SFP modules will always be
> > emitting. This could be an issue when using modules using laser as their
> > light source as we would have no way to disable it when the fiber is
> > removed. This patch adds a warning when registering an SFP cage which do
> > not have its tx_disable pin wired or available.
> 
> Is this something that was done in a possibly earlier revision of a
> given board design and which was finally fixed? Nothing wrong with the
> patch, but this seems like a pretty serious board design mistake, that
> needs to be addressed.

Hi Florian

Zii Devel B is like this. Only the "Signal Detect" pin is wired to a
GPIO.

	Andrew