netdev - Re: [PATCH 1/3] net: ocelot: add support to get mac from device-tree

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Message-ID: <20211028161522.6b711bb2@xps-bootlin>
Date:   Thu, 28 Oct 2021 16:15:22 +0200
From:   Clément Léger <clement.leger@...tlin.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        Andrew Lunn <andrew@...n.ch>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] net: ocelot: add support to get mac from
 device-tree

Le Thu, 28 Oct 2021 14:06:12 +0000,
Vladimir Oltean <vladimir.oltean@....com> a écrit :

> On Thu, Oct 28, 2021 at 03:49:30PM +0200, Clément Léger wrote:
> > Add support to get mac from device-tree using of_get_mac_address.
> > 
> > Signed-off-by: Clément Léger <clement.leger@...tlin.com>
> > ---
> >  drivers/net/ethernet/mscc/ocelot_vsc7514.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/net/ethernet/mscc/ocelot_vsc7514.c
> > b/drivers/net/ethernet/mscc/ocelot_vsc7514.c index
> > d51f799e4e86..c39118e5b3ee 100644 ---
> > a/drivers/net/ethernet/mscc/ocelot_vsc7514.c +++
> > b/drivers/net/ethernet/mscc/ocelot_vsc7514.c @@ -526,7 +526,10 @@
> > static int ocelot_chip_init(struct ocelot *ocelot, const struct
> > ocelot_ops *ops) ocelot_pll5_init(ocelot);
> >  
> > -	eth_random_addr(ocelot->base_mac);
> > +	ret = of_get_mac_address(ocelot->dev->of_node,
> > ocelot->base_mac);  
> 
> Why not per port? This is pretty strange, I think.

Hi Vladimir,

Currently, all ports share the same base mac address (5 first
bytes). The final mac address per port is computed in ocelot_probe_port
by adding the port number as the last byte of the mac_address provided.

Clément

> 
> > +	if (ret)
> > +		eth_random_addr(ocelot->base_mac);
> > +
> >  	ocelot->base_mac[5] &= 0xf0;
> >  
> >  	return 0;
> > -- 
> > 2.33.0
>