netdev - Re: [PATCH net-next RFC v4 3/5] dt-bindings: net: phy: add timestamp preferred choice property

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Message-ID: <20230429174217.rawjgcxuyqs4agcf@skbuf>
Date:   Sat, 29 Apr 2023 20:42:17 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Köry Maincent <kory.maincent@...tlin.com>
Cc:     netdev@...r.kernel.org, kuba@...nel.org, glipus@...il.com,
        maxime.chevallier@...tlin.com, vadim.fedorenko@...ux.dev,
        richardcochran@...il.com, gerhard@...leder-embedded.com,
        thomas.petazzoni@...tlin.com, krzysztof.kozlowski+dt@...aro.org,
        robh+dt@...nel.org, linux@...linux.org.uk
Subject: Re: [PATCH net-next RFC v4 3/5] dt-bindings: net: phy: add timestamp
 preferred choice property

On Wed, Apr 12, 2023 at 03:44:46PM +0200, Köry Maincent wrote:
> On Wed, 12 Apr 2023 16:14:21 +0300 Vladimir Oltean <vladimir.oltean@....com> wrote:
> > Do we need this device tree functionality?
> 
> I would say so. Expected as I wrote the patch. ;)
> 
> My point was that the new behavior to MAC as default timestamping does not fit
> all the case, especially when a board is designed with PHY like the TI PHYTER
> which is a far better timestamping choice (according to Richard). The user
> doesn't need to know this, he wants to have the better time stamp selected by
> default without any investigation. That's why having devicetree property for
> that could be useful.

The TI PHYTER is the "NatSemi DP83640" entry in the whitelist for PHYs
that still use their timestamping by default. Can you please come up
with an example which is actually useful?