netdev - Re: [PATCH 03/14] net: davicom: dm9000: allow to pass MAC address through mac

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Message-Id: <C7991495-F233-4186-82A2-43C39898C8B3@goldelico.com>
Date:   Wed, 12 Feb 2020 09:13:52 +0100
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Andrew Lunn <andrew@...n.ch>, Paul Cercueil <paul@...pouillou.net>,
        Paul Boddie <paul@...die.org.uk>,
        Alex Smith <alex.smith@...tec.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paulburton@...nel.org>,
        James Hogan <jhogan@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Petr Štetiar <ynezz@...e.cz>,
        Richard Fontana <rfontana@...hat.com>,
        Allison Randal <allison@...utok.net>,
        Stephen Boyd <swboyd@...omium.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, linux-mips@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Linux I2C <linux-i2c@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        letux-kernel@...nphoenux.org, kernel@...a-handheld.com
Subject: Re: [PATCH 03/14] net: davicom: dm9000: allow to pass MAC address through mac_addr module parameter


> Am 12.02.2020 um 09:07 schrieb Geert Uytterhoeven <geert@...ux-m68k.org>:
> 
> On Tue, Feb 11, 2020 at 11:25 PM Andrew Lunn <andrew@...n.ch> wrote:
>> On Tue, Feb 11, 2020 at 10:41:20PM +0100, H. Nikolaus Schaller wrote:
>>> This is needed to give the MIPS Ingenic CI20 board a stable MAC address
>>> which can be optionally provided by vendor U-Boot.
>>> 
>>> For get_mac_addr() we use an adapted copy of from ksz884x.c which
>>> has very similar functionality.
>>> 
>>> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
>> 
>> Hi Nikolaus
>> 
>> Please split these patches by subsystem. So this one patch needs to go
>> via netdev.
>> 
>>> +static char *mac_addr = ":";
>>> +module_param(mac_addr, charp, 0);
>>> +MODULE_PARM_DESC(mac_addr, "MAC address");
>> 
>> Module parameters are not liked.
>> 
>> Can it be passed via device tree? The driver already has code to get
>> it out of the device tree.
> 
> Yep, typically U-Boot adds an appropriate "local-mac-address" property to the
> network device's device node, based on the "ethernet0" alias.
> 
> However, the real clue here may be "vendor U-Boot", i.e. no support for the
> above?

Yes. It is a fallback solution like it is implemented for ksz884x.c to make it
work with existing (older) U-Boot installation.

Maybe I should better clarify this in the commit message for v2 (which goes
to netdev only).

BR and thanks,
Nikolaus