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

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Date:   Wed, 12 Feb 2020 09:07:52 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     "H. Nikolaus Schaller" <hns@...delico.com>,
        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

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?

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