linux-kernel - Re: gpio-exar: Why filtering out Commtech devices?

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Date:   Mon, 22 May 2017 07:51:05 +0200
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-serial <linux-serial@...r.kernel.org>,
        linux-gpio <linux-gpio@...r.kernel.org>
Subject: Re: gpio-exar: Why filtering out Commtech devices?

On 2017-05-22 07:48, Jan Kiszka wrote:
> On 2017-05-21 22:08, Sudip Mukherjee wrote:
>> Hi Jan,
>>
>> On 21/05/17 12:46, Jan Kiszka wrote:
>>> Hi Sudip,
>>>
>>> why do we carry
>>>
>>>     if (pcidev->vendor != PCI_VENDOR_ID_EXAR)
>>>         return -ENODEV;
>>>
>>> in gpio_exar_probe? This effectively prevents that
>>>
>>>     EXAR_DEVICE(COMMTECH, COMMTECH_4222PCIE, pbn_exar_XR17V35x),
>>>     EXAR_DEVICE(COMMTECH, COMMTECH_4224PCIE, pbn_exar_XR17V35x),
>>>     EXAR_DEVICE(COMMTECH, COMMTECH_4228PCIE, pbn_exar_XR17V35x),
>>>
>>> gain GPIO support. Do those devices lack access to the pins? Or can we
>>> drop the filter. I don't have access to those devices, just wondering
>>> because the code is not explaining the reason.
>>
>> Same here. I do not have these devices and have no idea if they support
>> the gpio pins or not.
>>
>> Adding Matt Schulte in the Cc list, maybe he can comment.
>>
>>
> 
> If we need to keep the condition, it should be moved over to 8250_exar:
> there is no point in creating the platform device at all then. But let's
> wait for Matt's comment.

Unfortunately, his account is no longer existing. Is there anyone else
we can ask?

Jan

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