netdev - Re: [PATCH RFC net-next] net: phy: add Marvell PHY PTP support [multicast/DSA issues]

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Date:   Fri, 3 Mar 2023 09:32:49 -0800
From:   Richard Cochran <richardcochran@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     "Russell King (Oracle)" <linux@...linux.org.uk>,
        Michael Walle <michael@...le.cc>, davem@...emloft.net,
        f.fainelli@...il.com, hkallweit1@...il.com,
        kory.maincent@...tlin.com, kuba@...nel.org,
        maxime.chevallier@...tlin.com, netdev@...r.kernel.org,
        thomas.petazzoni@...tlin.com
Subject: Re: [PATCH RFC net-next] net: phy: add Marvell PHY PTP support
 [multicast/DSA issues]

On Fri, Mar 03, 2023 at 05:34:35PM +0100, Andrew Lunn wrote:
> > > 4) Some solution to the default choice if there is no DT property.
> > 
> > I thought (4) was what we have been discussing... but the problem
> > seems to be that folk want to drill down into the fine detail about
> > whether PHY or MAC timestamping is better than the other.
> > 
> > As I've already stated, I doubt DT maintainers will wear having a
> > DT property for this, on the grounds that it's very much a software
> > control rather than a hardware description.
> 
> We can argue it is describing the hardware. In that hardware blob X
> has a better implementation of PTP than hardware blob Y. That could be
> because of the basic features of the blob, like resolution, adjustable
> clocks, or board specific features, like temperature compensated
> crystals, etc.

IMO a DTS property is the most user friendly solution, even if it
isn't strictly hardware description.

Thanks,
Richard