linux-kernel - Re: [PATCH v2 3/3] nvmem: add ONIE nvmem cells parser

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Date:   Wed, 08 Sep 2021 12:56:48 +0300
From:   Vadym Kochan <vadym.kochan@...ision.eu>
To:     Jan Lübbe <jlu@...gutronix.de>
Cc:     Vadym Kochan <vadym.kochan@...ision.eu>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Robert Marko <robert.marko@...tura.hr>
Subject: Re: [PATCH v2 3/3] nvmem: add ONIE nvmem cells parser


Hi Jan,

Jan Lübbe <jlu@...gutronix.de> writes:

> Hi,
>
> On Tue, 2021-06-08 at 22:03 +0300, Vadym Kochan wrote:
>
> ...
>> +	case 0x24: return "mac-address";
> ...

This is a base mac,

>> +	case 0x2A: return "num-macs";
>
> Is suspect these properties define which range of MACs is assigned to the

Yes

> device. How would you use them to assign MAC addresses to multiple interfaces?
> The nvmem-cells property in the network device's node can only refer to one
> cell, and not to i.e the cells value + 1.
>

Currently in net/ethernet/marvell/prestera/prestera_main.c it is
incremented and hard-coded by the driver.

> I think it would be useful to have a way to express this setup for systems with
> many interfaces, but am unsure of where this should be described. Maybe a "mac-
> address-offset" property in the generic ethernet controller binding?
>
> Regards,
> Jan

May be something like eth_address_provider should be introduced in
net/ethernet/ ?

This provider can provide something like eth_provider_address_next() which
will consider "mac-address-num" (or other specific fields).