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

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Message-ID: <CAHp75VeH-3+k+xvMw--vk1DBtYj6Qdnczh7z77H3fboDzMScRQ@mail.gmail.com>
Date:   Sat, 27 May 2017 16:52:28 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Jan Kiszka <jan.kiszka@...mens.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 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?

-- 
With Best Regards,
Andy Shevchenko