linux-kernel - Re: [PATCH 1/1] gpio: core: Decouple open drain/source flag with active low/high

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Date:   Thu, 6 Apr 2017 20:30:20 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Laxman Dewangan <ldewangan@...dia.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Frank Rowand <frowand.list@...il.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/1] gpio: core: Decouple open drain/source flag with
 active low/high

On Thu, Apr 6, 2017 at 7:56 PM, Laxman Dewangan <ldewangan@...dia.com> wrote:
> On Thursday 06 April 2017 09:40 PM, Andy Shevchenko wrote:
>> On Thu, Apr 6, 2017 at 4:35 PM, Laxman Dewangan <ldewangan@...dia.com>
>> wrote:

>>> Adding different flag for the Open Drain/Open Source which is valid
>>> only when Single ended flag is enabled.
>>>          if (single_ended) {
>>> -               if (active_low)
>>> +               if (open_drain)
>>
>> This breaks ACPI case, right?

> In acpi case, single_ended is not handled. It only handles the active LOW.
>
> From code:

Fair enough.
I would look into ACPI spec for possibility to add this kind of functionality.

Thanks.

-- 
With Best Regards,
Andy Shevchenko