linux-kernel - Re: [PATCH net-next 0/2] net: phy: mscc: support LOS active low

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Message-ID: <20200227161010.GC1686232@kwain>
Date:   Thu, 27 Feb 2020 17:10:10 +0100
From:   Antoine Tenart <antoine.tenart@...tlin.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Antoine Tenart <antoine.tenart@...tlin.com>, davem@...emloft.net,
        f.fainelli@...il.com, hkallweit1@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 0/2] net: phy: mscc: support LOS active low

Hello Andrew,

On Thu, Feb 27, 2020 at 04:54:40PM +0100, Andrew Lunn wrote:
> On Thu, Feb 27, 2020 at 04:40:31PM +0100, Antoine Tenart wrote:
> > 
> > This series adds a device tree property for the VSC8584 PHY family to
> > describe the LOS pin connected to the PHY as being active low. This new
> > property is then used in the MSCC PHY driver.
> 
> I think i'm missing the big picture.
> 
> Is this for when an SFP is connected directly to the PHY? The SFP
> output LOS, indicating loss of received fibre/copper signal, is active
> low?

Yes, the SFP cage can be connected directly to the PHY, and the SFP LOS
signal is active low (there's a pull-up on the LOS line).

Also, I realized I send this series before my other patches adding
support for fibre mode on this PHY, so it may make more sense to send
this one after.

Thanks!
Antoine

-- 
Antoine Ténart, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com