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

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Date:   Tue, 25 Apr 2017 10:30:18 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Jan Kiszka <jan.kiszka@...mens.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 Tue, Apr 25, 2017 at 8:44 AM, Jan Kiszka <jan.kiszka@...mens.com> wrote:
> 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.

>>> +       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

Yes. And how does it change my statement? You may use one record here
instead of two.

>
>>> +       {
>>> +               .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.

Got it, though asset_tag here is redundant as well.

-- 
With Best Regards,
Andy Shevchenko