linux-kernel - Re: [net-next: PATCH 01/12] net: phy: fixed_phy: switch to fwnode

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Date:   Tue, 21 Jun 2022 11:01:53 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Marcin Wojtas <mw@...ihalf.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Len Brown <lenb@...nel.org>, vivien.didelot@...il.com,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>, pabeni@...hat.com,
        Heiner Kallweit <hkallweit1@...il.com>,
        Grzegorz Bernacki <gjb@...ihalf.com>,
        Grzegorz Jaszczyk <jaz@...ihalf.com>,
        Tomasz Nowicki <tn@...ihalf.com>,
        Samer El-Haj-Mahmoud <Samer.El-Haj-Mahmoud@....com>,
        upstream@...ihalf.com
Subject: Re: [net-next: PATCH 01/12] net: phy: fixed_phy: switch to fwnode_
 API

On Tue, Jun 21, 2022 at 11:56:06AM +0200, Marcin Wojtas wrote:
> pon., 20 cze 2022 o 19:59 Andrew Lunn <andrew@...n.ch> napisał(a):
> >
> > On Mon, Jun 20, 2022 at 05:02:14PM +0200, Marcin Wojtas wrote:
> > > This patch allows to use fixed_phy driver and its helper
> > > functions without Device Tree dependency, by swtiching from
> > > of_ to fwnode_ API.
> >
> > Do you actually need this? phylink does not use this code, it has its
> > own fixed link implementation. And that implementation is not limited
> > to 1G.
> >
> 
> Yes, phylink has its own fixed-link handling, however the
> net/dsa/port.c relies on fixed_phy helpers these are not 1:1
> equivalents. I assumed this migration (fixed_phy -> phylink) is not
> straightforward and IMO should be handled separately. Do you recall
> justification for not using phylink in this part of net/dsa/*?

All modern DSA drivers use phylink and not fixed-phy as far as I'm
aware - there are a number that still implement the .adjust_link
callback, but note in dsa_port_link_register_of():

        if (!ds->ops->adjust_link) {
	...
		return 0;
	}

	dev_warn(ds->dev,
		 "Using legacy PHYLIB callbacks. Please migrate to PHYLINK!\n");

It's really just that they haven't been migrated.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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