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From:   Rob Herring <robh+dt@kernel.org>
Date:   Fri, 25 Sep 2020 12:24:12 -0600
Message-ID: <CAL_JsqKhyeh2=pJcpBKkh+s3FM__DY+VoYSYJLRUErrujTLn9A@mail.gmail.com>
Subject: Re: [PATCH v3 3/4] of_net: add mac-address-increment support
To:     Ansuel Smith <ansuelsmth@gmail.com>
Cc:     Miquel Raynal <miquel.raynal@bootlin.com>,
        Richard Weinberger <richard@nod.at>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>, Andrew Lunn <andrew@lunn.ch>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        Russell King <linux@armlinux.org.uk>,
        Frank Rowand <frowand.list@gmail.com>,
        Boris Brezillon <bbrezillon@kernel.org>,
        MTD Maling List <linux-mtd@lists.infradead.org>,
        devicetree@vger.kernel.org,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        netdev <netdev@vger.kernel.org>
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On Sun, Sep 20, 2020 at 3:57 AM Ansuel Smith <ansuelsmth@gmail.com> wrote:
>
> Lots of embedded devices use the mac-address of other interface
> extracted from nvmem cells and increments it by one or two. Add two
> bindings to integrate this and directly use the right mac-address for
> the interface. Some example are some routers that use the gmac
> mac-address stored in the art partition and increments it by one for the
> wifi. mac-address-increment-byte bindings is used to tell what byte of
> the mac-address has to be increased (if not defined the last byte is
> increased) and mac-address-increment tells how much the byte decided
> early has to be increased.

I'm inclined to say if there's a platform specific way to transform
MAC addresses, then there should be platform specific code to do that
which then stuffs the DT using standard properties. Otherwise, we have
a never ending stream of 'generic' properties to try to handle
different platforms' cases.

Rob