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

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Message-ID: <518e0cf1-ef7e-b251-a153-34e01a80267d@gmail.com>
Date:   Tue, 23 Oct 2018 10:03:36 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Joakim Tjernlund <Joakim.Tjernlund@...inera.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:     andrew@...n.ch
Subject: Re: ethernet "bus" number in DTS ?

On 10/23/18 9:49 AM, 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?

It could, do we want and need to, no. You have the Ethernet alias in
/sys/class/net/*/device/uevent already that would allow you to perform
that (re)naming in user-space:

# cat /sys/class/net/eth0/device/uevent
DRIVER=bcmgenet
OF_NAME=ethernet
OF_FULLNAME=/rdb/ethernet@...80000
OF_TYPE=network
OF_COMPATIBLE_0=brcm,genet-v5
OF_COMPATIBLE_N=1
OF_ALIAS_0=eth0			<==================
MODALIAS=of:NethernetTnetworkCbrcm,genet-v5
-- 
Florian