linux-kernel - Re: [PATCH 2/3 V2] gpio: add STMPE811 gpio controller support

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Message-ID: <20100614122853.GC12027@pengutronix.de>
Date:	Mon, 14 Jun 2010 14:28:53 +0200
From:	Luotao Fu <l.fu@...gutronix.de>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Luotao Fu <l.fu@...gutronix.de>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3 V2] gpio: add STMPE811 gpio controller support

Hi Mark,
On Mon, Jun 14, 2010 at 01:13:49PM +0100, Mark Brown wrote:
> On Mon, Jun 14, 2010 at 02:09:43PM +0200, Luotao Fu wrote:
> > On Mon, Jun 14, 2010 at 12:51:23PM +0100, Mark Brown wrote:
> 
> > > Assuming you're able to do interrupts on the GPIOs you should now be
> > > able to implement to_irq() as well.
> 
> > The chip can indeed generate irqs on the GPIO line. I, however, kept out
> > the irq stuff for now because i want to get the core functionalies done
> > for this turn. I'd like to add the irq stuff with a separate patch later.
> 
> It should be a trivial function - it just does a mapping from a GPIO
> number to an IRQ number.

right, to_irq is simple. However, there're some more stuff necessary for
gpio irq on this chip, since it has separate registers for GPIO
interrupt control and status. A further gpio chip might be needed
needed to get the stuff done. Hence I'd like to push out the most
importatn core funcationalities out for the first turn before I take a
deeper look into other stuffs.

thanks

cheers
Luotao Fu

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