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

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Date:   Mon, 7 Nov 2022 15:50:37 -0500
From:   Sean Anderson <sean.anderson@...o.com>
To:     Vladimir Oltean <olteanv@...il.com>, Rob Herring <robh@...nel.org>
Cc:     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>,
        Saravana Kannan <saravanak@...gle.com>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH net-next v2 08/11] of: property: Add device link support
 for PCS

On 11/7/22 15:22, Vladimir Oltean wrote:
> On Mon, Nov 07, 2022 at 02:10:10PM -0600, Rob Herring wrote:
>> On Thu, Nov 03, 2022 at 05:06:47PM -0400, Sean Anderson wrote:
>> > This adds device link support for PCS devices. Both the recommended
>> > pcs-handle and the deprecated pcsphy-handle properties are supported.
>> > This should provide better probe ordering.
>> > 
>> > Signed-off-by: Sean Anderson <sean.anderson@...o.com>
>> > ---
>> > 
>> > (no changes since v1)
>> > 
>> >  drivers/of/property.c | 4 ++++
>> >  1 file changed, 4 insertions(+)
>> 
>> Seems like no dependency on the rest of the series, so I can take this 
>> patch?
> 
> Is fw_devlink well-behaved these days, so as to not break (forever defer)
> the probing of the device having the pcs-handle, if no driver probed on
> the referenced PCS? Because the latter is what will happen if no one
> picks up Sean's patches to probe PCS devices in the usual device model
> way, I think.

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.

--Sean

[1] https://lore.kernel.org/netdev/CAGETcx97ijCpVyOqCfnrDuGh+SahQCC-3QrJta5HOscUkJQdEw@mail.gmail.com/