linux-kernel - Re: [PATCH] net: phy: dp83867: Port mirroring support in the DP83867 TI's PHY driver

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Date:   Wed, 1 Feb 2017 22:14:40 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Lukasz Majewski <lukma@...x.de>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Mugunthan V N <mugunthanvnm@...com>,
        Karicheri Muralidharan <m-karicheri2@...com>,
        linux-kernel@...r.kernel.org, Eric Engestrom <eric@...estrom.ch>,
        netdev@...r.kernel.org, Kishon Vijay Abraham I <kishon@...com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH] net: phy: dp83867: Port mirroring support in the DP83867
 TI's PHY driver

> We would need a tri-state device tree properly:
> 
> 1. Not defined - do nothing
> 2. Defined as 0 -> explicitly disable port mirroring
> 3. Defined as 1 -> explicitly enable port mirriring
> 
> The "net-phy-lane-swap" only fulfills points 1 and 3 above.
> 
> In my use case I do need point 2.

Looking at the datasheet, PORT_MIRROR_EN defaults to 0. So it seems
reasonable to unconditionally set it to 0 when the PHY driver
loads. Any device which needs a value of 1 can set "net-phy-lane-swap"

       Andrew