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

From: Lukasz Majewski <[email-masked]>
Date: Wed, 1 Feb 2017 23:13:23 +0100

Hi Andrew,

> > 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"

Unconditionally setting this field to 0 (as we expect the reset default
setting) seems to me like a good solution. 

However, I was not sure if such approach is acceptable by the community.

>        Andrew

Best regards,

Lukasz Majewski

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