linux-kernel - Re: [PATCH v3 10/10] serial: exar: Add support for IOT2040 device

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Date:   Sun, 28 May 2017 18:41:52 +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 v3 10/10] serial: exar: Add support for IOT2040 device

On 2017-05-27 15:52, Andy Shevchenko wrote:
> On Fri, May 26, 2017 at 7:02 PM, 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.
> 
>>  static void *
>> -xr17v35x_register_gpio(struct pci_dev *pcidev, unsigned int first_pin,
>> -                      unsigned int npins)
>> +__xr17v35x_register_gpio(struct pci_dev *pcidev, unsigned int first_pin,
>> +                        unsigned int npins)
> 
>> +static int xr17v35x_register_gpio(struct pci_dev *pcidev,
>> +                                 struct uart_8250_port *port)
>> +{
>> +       if (pcidev->vendor == PCI_VENDOR_ID_EXAR)
>> +               port->port.private_data =
>> +                       __xr17v35x_register_gpio(pcidev, 0, 16);
>> +
>> +       return 0;
>> +}
> 
>> -               if (pcidev->vendor == PCI_VENDOR_ID_EXAR)
>> -                       port->port.private_data =
>> -                               xr17v35x_register_gpio(pcidev, 0, 16);
>> +               ret = platform->register_gpio(pcidev, port);
>>         }
> 
> Can't you move at least some of this to the patch where you move the check?
> 

This change is unrelated to that patch.

What I can offer is a separate patch to factor this out, but I'm not
sure it would buy us much.

Jan

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