linux-kernel - Re: [PATCH net-next v2 0/2] of: mdio: Fall back to mdiobus_register() with NULL device

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Message-ID: <CAMuHMdXfOOgADe1my9Y3s3b9_OsXPjbqq1PPFR9izZWhtPuaFg@mail.gmail.com>
Date:   Wed, 16 May 2018 10:54:12 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev <netdev@...r.kernel.org>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        "David S. Miller" <davem@...emloft.net>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Fugang Duan <fugang.duan@....com>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Antoine Tenart <antoine.tenart@...e-electrons.com>,
        Tobias Jordan <Tobias.Jordan@...ktrobit.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Simon Horman <horms+renesas@...ge.net.au>,
        Maxim Uvarov <muvarov@...il.com>, Sekhar Nori <nsekhar@...com>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:RENESAS ETHERNET DRIVERS" 
        <linux-renesas-soc@...r.kernel.org>,
        "open list:TI ETHERNET SWITCH DRIVER (CPSW)" 
        <linux-omap@...r.kernel.org>,
        "open list:USB NETWORKING DRIVERS" <linux-usb@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH net-next v2 0/2] of: mdio: Fall back to mdiobus_register()
 with NULL device_node

Hi Florian,

Thanks for your series!
I like the effect on simplifying drivers.

On Wed, May 16, 2018 at 1:56 AM, Florian Fainelli <f.fainelli@...il.com> wrote:
> This patch series updates of_mdiobus_register() such that when the device_node
> argument is NULL, it calls mdiobus_register() directly. This is consistent with
> the behavior of of_mdiobus_register() when CONFIG_OF=n.

IMHO the CONFIG_OF=n behavior of of_mdiobus_register() (which I wasn't
aware of) is inconsistent with the behavior of other of_*() functions,
which are just empty stubs.

So I'm wondering if you should do it the other way around, and let
mdiobus_register() call of_mdiobus_register() if dev->of_node exists?

This does mean mdiobus_register() should gain a struct device * parameter,
and thus changes to many more drivers are needed.

> I only converted the most obvious drivers, there are others that have a much
> less obvious behavior and specifically attempt to deal with CONFIG_ACPI.

I haven't looked at the ACPI handling, but perhaps this can be moved
inside mdiobus_register() as well?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds