linux-kernel - Re: [PATCH] net: cpsw: fix obtaining mac address for am3517

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Date:   Fri, 21 Oct 2016 09:36:22 +0200
From:   Jeroen Hofstee <jhofstee@...tronenergy.com>
To:     Tony Lindgren <tony@...mide.com>
CC:     <netdev@...r.kernel.org>, Mugunthan V N <mugunthanvnm@...com>,
        "Grygorii Strashko" <grygorii.strashko@...com>,
        <linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: cpsw: fix obtaining mac address for am3517

Hello Tony,

On 21-10-16 08:38, Tony Lindgren wrote:
> * Jeroen Hofstee <jhofstee@...tronenergy.com> [161020 12:57]:
>> Commit b6745f6e4e63 ("drivers: net: cpsw: davinci_emac: move reading mac
>> id to common file") did not only move the code for an am3517, it also
>> added the slave parameter, resulting in a invalid (all zero) mac address
>> being returned. So change it back to always read from slave zero, so it
>> works again.
> Hmm doesn't this now break it for cpsw with two instances?
>

Yes, well, they get the same mac address at least. But does it matter?
This changes davinci_emac_3517_get_macid, the only way to get there
is:

     if (of_device_is_compatible(dev->of_node, "ti,am3517-emac"))
         return davinci_emac_3517_get_macid(dev, 0x110, slave, mac_addr)

and the only user of ti,am3517-emac is arch/arm/boot/dts/am3517.dtsi,
which only has one emac. So the change is already am3517 specific.

> We may need am3517 specific quirk flag instead?

Given above, it is already am3517 specific. Let me know if you prefer this
route then I will have a look at it.

Regards,
Jeroen