netdev - Re: ethernet "bus" number in DTS ?

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Message-ID: <20181023170854.GW26497@lunn.ch>
Date:   Tue, 23 Oct 2018 19:08:54 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Joakim Tjernlund <Joakim.Tjernlund@...inera.com>
Cc:     "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: ethernet "bus" number in DTS ?

On Tue, Oct 23, 2018 at 04:49:59PM +0000, Joakim Tjernlund wrote:
> SPI (and others) has a way to define bus number in a aliases:
> 	aliases {
> 		ethernet4 = &enet4;
> 		ethernet0 = &enet0;
> 		ethernet1 = &enet1;
> 		ethernet2 = &enet2;
> 		ethernet3 = &enet3;
> 		spi0 = &spi0
> 	};
> The 0 in the spi0 alias will translate to bus num 0 so one can control the /dev nodes, like /dev/spidev0
> I am looking for the same for ethernet devices:
>  ethernet4 = &enet4;  /* should become eth4 */
>  ethernet0 = &enet0;  /* should become eth0 */
> but I cannot find something like that for eth devices.
> 
> Could such functionality be added?

Hi Jocke

This has been discussed before. Take a look at
arch/arm/boot/dts/armada-38x.dtsi

                        /*
                         * As a special exception to the "order by
                         * register address" rule, the eth0 node is
                         * placed here to ensure that it gets
                         * registered as the first interface, since
                         * the network subsystem doesn't allow naming
                         * interfaces using DT aliases. Without this,
                         * the ordering of interfaces is different
                         * from the one used in U-Boot and the
                         * labeling of interfaces on the boards, which
                         * is very confusing for users.
                         */

You should be able to find the discuss about this, and why aliases
cannot be used.

       Andrew