linux-kernel - Re: [net-next: PATCH v4 2/8] net: mdio: switch fixed-link PHYs API to fwnode

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Message-ID: <20230116181618.2iz54jywj7rqzygu@skbuf>
Date:   Mon, 16 Jan 2023 20:16:18 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     Marcin Wojtas <mw@...ihalf.com>, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, netdev@...r.kernel.org,
        rafael@...nel.org, andriy.shevchenko@...ux.intel.com,
        sean.wang@...iatek.com, Landen.Chao@...iatek.com,
        linus.walleij@...aro.org, andrew@...n.ch, vivien.didelot@...il.com,
        f.fainelli@...il.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, hkallweit1@...il.com,
        jaz@...ihalf.com, tn@...ihalf.com, Samer.El-Haj-Mahmoud@....com
Subject: Re: [net-next: PATCH v4 2/8] net: mdio: switch fixed-link PHYs API
 to fwnode_

On Mon, Jan 16, 2023 at 05:50:13PM +0000, Russell King (Oracle) wrote:
> On Mon, Jan 16, 2023 at 06:34:14PM +0100, Marcin Wojtas wrote:
> > fixed-link PHYs API is used by DSA and a number of drivers
> > and was depending on of_. Switch to fwnode_ so to make it
> > hardware description agnostic and allow to be used in ACPI
> > world as well.
> 
> Would it be better to let the fixed-link PHY die, and have everyone use
> the more flexible fixed link implementation in phylink?

Would it be even better if DSA had some driver-level prerequisites to
impose for ACPI support - like phylink support rather than adjust_link -
and we would simply branch off to a dsa_shared_port_link_register_acpi()
function, leaving the current dsa_shared_port_link_register_of() alone,
with all its workarounds and hacks? I don't believe that carrying all
that logic over to a common fwnode based API is the proper way forward.