netdev - Re: [PATCH net-next v2 08/11] of: property: Add device link support for PCS

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Date:   Wed, 9 Nov 2022 23:56:40 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     Rob Herring <robh@...nel.org>,
        Sean Anderson <sean.anderson@...o.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Madalin Bucur <madalin.bucur@....com>,
        "David S . Miller" <davem@...emloft.net>,
        Frank Rowand <frowand.list@...il.com>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH net-next v2 08/11] of: property: Add device link support
 for PCS

On Tue, Nov 08, 2022 at 12:56:15PM -0800, Saravana Kannan wrote:
> > > Last time [1], Saravana suggested to move this to the end of the series to
> > > avoid such problems. FWIW, I just tried booting a LS1046A with the
> > > following patches applied
> > >
> > > 01/11 (compatibles) 05/11 (device) 08/11 (link) 09/11 (consumer)
> > > =================== ============== ============ ================
> > > Y                   N              Y            N
> > > Y                   Y              Y            Y
> > > Y                   Y              Y            N
> > > N                   Y              Y            N
> > > N                   N              Y            N
> > >
> > > and all interfaces probed each time. So maybe it is safe to pick
> > > this patch.
> >
> > Maybe? Just take it with the rest of the series.
> >
> > Acked-by: Rob Herring <robh@...nel.org>
> 
> Let's have Vladimir ack this. I'm not sure if it's fully safe yet. I
> haven't done the necessary fixes for phy-handle yet, but I don't know
> how pcs-handle and pcsphy-handle are used or if none of their uses
> will hit the chicken and egg problem that some uses of phy-handle hit.

I can confirm that on today's net-next, the driver owning the pcs-handle
will probe even if the PCS driver is missing. With the mention that it
only does so after the driver_deferred_probe_timeout, which also in
today's net-next is by default 10 seconds if CONFIG_MODULES=y.