linux-kernel - Re: [PATCH v2 6/6] serial: exar: Add support for IOT2040 device

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Message-ID: <CAHp75VcAiGFzfhd-609zsuscU19STQOme3Y91d1amaDToO8=oA@mail.gmail.com>
Date:   Thu, 18 May 2017 20:41:57 +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 v2 6/6] serial: exar: Add support for IOT2040 device

On Thu, May 18, 2017 at 7:39 PM, Jan Kiszka <jan.kiszka@...mens.com> wrote:
> On 2017-05-18 18:33, Andy Shevchenko wrote:
>> On Thu, May 18, 2017 at 5:59 PM, Jan Kiszka <jan.kiszka@...mens.com> wrote:

>>> +static bool is_iot2040;
>>
>> No, please, use driver data of DMI and hide this in corresponding structure.
>> Or even assign  port->port.rs485_config in the callback function.
>>
>> Moreover, can't you use port->port.rs485_config != NULL instead?
>
> There are two cases to be handled on IOT2040: the setting of the
> rs485_config and the different setup of the GPIOs, but the latter at a
> specific point in the initialization only. So I don't see yet how
> driver_data could come into play and help.

struct exar_iot2040_setup {
...rs485_config();
...setup_gpio();
};

struct exar_iot2040_setup iot2040_setup = {
...
};

DMI:

.driver_data = (void *)&iot2040_setup;

Above is just unfinished proposal, since I have noticed your new mail.
So, it seems we are on the same page.

One thing, I still would consider to use device properties instead of
platform data (with consideration of MFD framework usage).

-- 
With Best Regards,
Andy Shevchenko