linux-kernel - Re: [PATCH] usbnet: smsc95xx: Add device tree input for MAC address

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Message-ID: <5252B777.2080102@ti.com>
Date:	Mon, 7 Oct 2013 08:30:31 -0500
From:	Dan Murphy <dmurphy@...com>
To:	Ming Lei <tom.leiming@...il.com>
CC:	Steve Glendinning <steve.glendinning@...well.net>,
	Network Development <netdev@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-usb <linux-usb@...r.kernel.org>, <mugunthanvnm@...com>
Subject: Re: [PATCH] usbnet: smsc95xx: Add device tree input for MAC address

On 10/07/2013 06:42 AM, Ming Lei wrote:
> On Mon, Oct 7, 2013 at 1:31 AM, Dan Murphy <dmurphy@...com> wrote:
>> On 10/06/2013 10:05 AM, Ming Lei wrote:
>>> On Sat, Oct 5, 2013 at 2:25 AM, Dan Murphy <dmurphy@...com> wrote:
>>>> If the smsc95xx does not have a valid MAC address stored within
>>>> the eeprom then a random number is generated.  The MAC can also
>>>> be set by uBoot but the smsc95xx does not have a way to read this.
>>>>
>>>> Create the binding for the smsc95xx so that uBoot can set the MAC
>>>> and the code can retrieve the MAC from the modified DTB file.
>>> Suppose there are two smsc95xx usbnet devices connected to usb bus, and
>>> one is built-in, another is hotplug device, can your patch handle the situation
>>> correctly?
>> Look at this line in the patch below
>>
>> sprintf(of_name, "%s%i", SMSC95XX_OF_NAME, dev->udev->dev.id);
>>
>> I am appending the dev ID of the device to the of_name here.  As long as init_mac_address is called, the dev.id and the uBoot
>> entry match then yes.
> Currently, non-root-hub usb device is created and added into usb bus without
> any platform(device tree) knowledge, so you can't expect the match here.

That is correct.  Platform/dev tree will have no concept of the PnP USB dongle therefore there should be no entry in either.

I will need to test this issue with a PnP usb->ethernet dongle.

Dan




> Also not mention the two smsc95xx devices may attach to two different
> usb host controllers(buses).
>
> Thanks,


-- 
------------------
Dan Murphy

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