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

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Message-ID: <42fd4a72-526c-cbd9-52db-9d8b495035ee@siemens.com>
Date:   Tue, 25 Apr 2017 12:07:15 +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 2017-04-25 11:46, Andy Shevchenko wrote:
> On Tue, Apr 25, 2017 at 12:00 PM, Jan Kiszka <jan.kiszka@...mens.com> wrote:
>> On 2017-04-25 09:30, Andy Shevchenko wrote:
>>> 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.
>>
>> How? Please be more verbose in your comments.
> 
>        {
>                .name = "SIMATIC IOT2000",
>                .func = 6,
>                .phy_addr = 1,
>        },
>        {
>                .name = "SIMATIC IOT2000",
>                .func = 7,
>                .phy_addr = 1,
>        },
> 
> That's all what you need.

Nope. Again: the asset tag is the way to tell both apart AND to ensure
that we do not match on future devices.

Jan

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