netdev - Re: [PATCH] dt: bindings: Add a generic ethernet device binding

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Date:	Sat, 16 Jul 2016 12:12:37 +0200
From:	Hans de Goede <hdegoede@...hat.com>
To:	David Miller <davem@...emloft.net>
Cc:	robh+dt@...nel.org, mark.rutland@....com,
	maxime.ripard@...e-electrons.com, wens@...e.org,
	netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH] dt: bindings: Add a generic ethernet device binding

Hi,

On 15-07-16 19:51, David Miller wrote:
> From: Hans de Goede <hdegoede@...hat.com>
> Date: Fri, 15 Jul 2016 08:40:00 +0200
>
>> Hi,
>>
>> On 15-07-16 01:17, David Miller wrote:
>>> From: Hans de Goede <hdegoede@...hat.com>
>>> Date: Wed, 13 Jul 2016 12:20:04 +0200
>>>
>>>> On some boards (android tablets) different batches use different sdio
>>>> wifi modules. This is not a problem since sdio is a discoverable bus,
>>>> so we only need to describe and activate the mmc controller in dt and
>>>> then the kernel will automatically load the right driver.
>>>>
>>>> But sometimes it is useful to specify certain ethernet properties for
>>>> these "unknown" sdio devices, specifically we want the boot-loader
>>>> to be able to set "local-mac-address" as some of these sdio wifi
>>>> modules come without an eeprom / without a factory programmed mac
>>>> address.
>>>>
>>>> Since the exact device is unknown (differs per batch) we cannot use
>>>> a wifi-chip specific compatible. This commit adds a new
>>>> "generic,ethernet" binding for use in dt-nodes describing such an
>>>> unknown ethernet device.
>>>>
>>>> Cc: Maxime Ripard <maxime.ripard@...e-electrons.com>
>>>> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
>>>
>>> Precedence exists for a "system ethernet address" as far back as the
>>> original sparc device tree implementation, so please just specify it
>>> that way rather than trying to force having to make an alias or
>>> reference to it from a specific device.
>>
>> Some boards where this is applicable have both a wired and a wireless
>> ethernet, so one global setting will not work.
>
> Then call it "eth:local-mac-address" and "wifi:local-mac-address"

Until we get a board with 2 ethernet interfaces, really the alias thing
is working fine here, that is not the problem.

Regards,

Hans