linux-kernel - Re: [PATCH 8/8] serial: exar: Add support for IOT2040 device

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Message-ID: <9c3fa989-b137-2935-23cd-d9c3a91c6ce6@siemens.com>
Date:   Thu, 18 May 2017 07:06:58 +0200
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>,
        Sascha Weisenberger <sascha.weisenberger@...mens.com>
Subject: Re: [PATCH 8/8] serial: exar: Add support for IOT2040 device

On 2017-05-13 15:54, Andy Shevchenko wrote:
> On Sat, May 13, 2017 at 10:29 AM, Jan Kiszka <jan.kiszka@...mens.com> wrote:
>> This implements the setup of RS232 and the switch-over to RS485 or RS422
>> for the Siemens IOT2040. That uses an EXAR XR17V352 with external logic
>> to switch between the different modes. The external logic is controlled
>> via MPIO pins of the EXAR controller.
>>
>> Only pin 10 can be exported as GPIO on the IOT2040. It is connected to
>> an LED.
>>
>> As the XR17V352 used on the IOT2040 is not equipped with an external
>> EEPROM, it cannot present itself as IOT2040-variant via subvendor/
>> subdevice IDs. Thus, we have to check via DMI for the target platform.
>>
>> Co-developed with Sascha Weisenberger.
>>
> 
> Please, refactor that using properly formed DMI structrure and use its
> callback and driver data facilities/

Could you point to a specific example? The callback of the dmi_system_id
structure is not designed to handle device initializations like this one
- not to speak of having those two different initialization points here.

Thanks,
Jan

-- 
Siemens AG, Corporate Technology, CT RDA ITP SES-DE
Corporate Competence Center Embedded Linux