From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Felipe Balbi <balbi@ti.com>
Cc: "Poddar, Sourav" <sourav.poddar@ti.com>,
devicetree-discuss@lists.ozlabs.org,
linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-input@vger.kernel.org
Subject: Re: [RFC/PATCH 4/4] gpio: smscece: Add support for gpio IO expander feature
Date: Tue, 21 Aug 2012 15:50:09 +0100 [thread overview]
Message-ID: <20120821145009.GE21557@sirena.org.uk> (raw)
In-Reply-To: <20120821122217.GF10347@arwen.pp.htv.fi>
On Tue, Aug 21, 2012 at 03:22:18PM +0300, Felipe Balbi wrote:
> On Tue, Aug 21, 2012 at 05:50:28PM +0530, Poddar, Sourav wrote:
> > If I am understanding correctly, if they both uses the same bit we cannot
> > use both for a particular user. ?
> we can, it's just a bit more complex. If a user request both LOW and
> HIGH, then you start with HIGH, once it triggers, before calling the
> nested IRQ handler, you need to change it LOW. When low triggers, before
> calling the nested IRQ handler, you need to change it to HIGH again. And
> so on. I'm just not sure if that's valid on linux IRQ subsystem.
The given example was for keypress - usually a system would use edge
triggered interrupts in combination with reading the GPIO state rather
than level triggered interrupts.
prev parent reply other threads:[~2012-08-21 14:50 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-21 10:45 [PATCH 0/4] Add mfd driver for smsc-ece1099 chip Sourav Poddar
2012-08-21 10:45 ` [PATCH 1/4] mfd: smsc: Add support for smsc gpio io/keypad driver Sourav Poddar
[not found] ` <1345545940-2232-2-git-send-email-sourav.poddar-l0cyMroinI0@public.gmane.org>
2012-08-21 12:41 ` Mark Brown
2012-08-21 12:42 ` Felipe Balbi
2012-08-21 13:22 ` Mark Brown
[not found] ` <20120821132222.GF7995-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>
2012-08-21 13:27 ` Felipe Balbi
2012-08-21 13:49 ` Mark Brown
2012-08-21 13:52 ` Felipe Balbi
2012-08-21 14:08 ` Mark Brown
2012-08-21 14:09 ` Felipe Balbi
2012-08-21 14:20 ` Mark Brown
2012-08-21 10:45 ` [PATCH 2/4] Input: keypad: Add smsc ece1099 keypad driver Sourav Poddar
2012-08-21 10:45 ` Felipe Balbi
2012-08-21 11:30 ` Poddar, Sourav
2012-08-21 10:46 ` Felipe Balbi
2012-08-21 11:31 ` Poddar, Sourav
2012-08-21 10:45 ` [PATCH 3/4] arm/dts: omap5-evm: Add keypad support Sourav Poddar
2012-08-21 10:47 ` Felipe Balbi
2012-08-21 11:20 ` Poddar, Sourav
2012-08-21 10:45 ` [RFC/PATCH 4/4] gpio: smscece: Add support for gpio IO expander feature Sourav Poddar
2012-08-21 10:53 ` Felipe Balbi
2012-08-21 11:47 ` Poddar, Sourav
2012-08-21 12:00 ` Felipe Balbi
2012-08-21 12:20 ` Poddar, Sourav
2012-08-21 12:22 ` Felipe Balbi
2012-08-21 14:50 ` Mark Brown [this message]
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