netdev - Re: [PATCH] stmmac: Add support for SIMATIC IOT2000 platform

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Date:   Tue, 25 Apr 2017 07:44:53 +0200
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Sascha Weisenberger <sascha.weisenberger@...mens.com>
Subject: Re: [PATCH] stmmac: Add support for SIMATIC IOT2000 platform

On 2017-04-24 23:27, Andy Shevchenko wrote:
> On Mon, Apr 24, 2017 at 10:27 PM, Jan Kiszka <jan.kiszka@...mens.com> wrote:
>> The IOT2000 is industrial controller platform, derived from the Intel
>> Galileo Gen2 board. The variant IOT2020 comes with one LAN port, the
>> IOT2040 has two of them. They can be told apart based on the board asset
>> tag in the DMI table.
>>
>> Based on patch by Sascha Weisenberger.
>>
> 
>> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
>> Signed-off-by: Sascha Weisenberger <sascha.weisenberger@...mens.com>
> 
> Shoudn't be ordered other way around?

Nope. My changes invalidated Sascha's signed-off on the original patch,
but he signed off again on the final version.

> 
>> +       const char *asset_tag;
> 
> I guess this is redundant. See below.
> 
>> +       {
>> +               .name = "SIMATIC IOT2000",
>> +               .asset_tag = "6ES7647-0AA00-0YA2",
>> +               .func = 6,
>> +               .phy_addr = 1,
>> +       },
> 
> The below has same definition disregard on asset_tag.
> 

There is a small difference in the asset tag, just not at the last digit
where one may expect it, look:

...-0YA2 -> IOT2020
...-1YA2 -> IOT2040

>> +       {
>> +               .name = "SIMATIC IOT2000",
>> +               .asset_tag = "6ES7647-0AA00-1YA2",
>> +               .func = 6,
>> +               .phy_addr = 1,
>> +       },
>> +       {
>> +               .name = "SIMATIC IOT2000",
>> +               .asset_tag = "6ES7647-0AA00-1YA2",
>> +               .func = 7,
>> +               .phy_addr = 1,
>> +       },
> 
> How this supposed to work if phy_addr is the same?
> 

That address space is MAC-local, and we have two different MACs here.

Jan

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