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

From: Andrew Lunn <[email-masked]>
Date: Wed, 1 Feb 2017 22:14:40 +0100

> 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