linux-kernel - Re: [PATCH 1/2] net: ethernet: davinci_emac: Use MAC Address from Device Tree

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Message-ID: <8cf5b8d1-5f03-438a-94bb-5691dee8cc86@lunn.ch>
Date:   Wed, 6 Sep 2023 14:39:01 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Adam Ford <aford173@...il.com>
Cc:     linux-omap@...r.kernel.org, aford@...conembedded.com,
        Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] net: ethernet: davinci_emac: Use MAC Address from
 Device Tree

On Wed, Sep 06, 2023 at 04:51:42AM -0500, Adam Ford wrote:
> Currently there is a device tree entry called "local-mac-address"
> which can be filled by the bootloader or manually set.This is
> useful when the user does not want to use the MAC address
> programmed into the SoC.
> 
> Currently, the davinci_emac reads the MAC from the DT, copies
> it from pdata->mac_addr to priv->mac_addr, then blindly overwrites
> it by reading from registers in the SoC, and falls back to a
> random MAC if it's still not valid.  This completely ignores any
> MAC address in the device tree.
> 
> In order to use the local-mac-address, check to see if the contents
> of priv->mac_addr are valid before falling back to reading from the
> SoC when the MAC address is not valid.
> 
> Signed-off-by: Adam Ford <aford173@...il.com>

There is the potential for regressions here, since behaviour is being
changed. But i do think what you are doing make sense.

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew