linux-kernel - Re: [RFC/PATCH 4/4] gpio: smscece: Add support for gpio IO expander feature

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Message-ID: <CAKdam55SqXiCGv766yxoY1GdDjxNCYNaDdNZPaeLTAXc+3+c6g@mail.gmail.com>
Date:	Tue, 21 Aug 2012 17:50:28 +0530
From:	"Poddar, Sourav" <sourav.poddar@...com>
To:	balbi@...com
Cc:	devicetree-discuss@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [RFC/PATCH 4/4] gpio: smscece: Add support for gpio IO expander feature

Hi,

On Tue, Aug 21, 2012 at 5:30 PM, Felipe Balbi <balbi@...com> wrote:
> Hi,
>
> On Tue, Aug 21, 2012 at 05:17:37PM +0530, Poddar, Sourav wrote:
>> >> +     if (type & IRQ_TYPE_LEVEL_HIGH)
>> >> +             sg->int_lvl[bank] |= bit;
>> >> +     else if (type & IRQ_TYPE_LEVEL_LOW)
>> >> +             sg->int_lvl[bank] &= ~bit;
>> >> +     else
>> >> +             return -EINVAL;
>> >
>> > this looks wrong. You could have a user who wants to trigger on both
>> > HIGH and LOW levels, no ?
>> >
>> Yes, I think there can be a scenario where gpio_keys are attached
>> to this driver and signals a "key press" at low and "key release" at
>> high. ?
>>  Will figure out a way to add support to check for case where
>> both High and low levels are used.
>
> could probably be done on a separate patch, maybe... Just now I saw that
> HIGH and LOW levels use the same bit.
>
If I am understanding correctly, if they both uses the same bit we cannot
use both for a particular user. ?
> --
> balbi
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