linux-kernel - Re: [RFC 2.6.28 1/3] gpiolib: add batch set/get

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Date:	Sun, 25 Jan 2009 12:20:24 +0100
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Jaya Kumar <jayakumar.lkml@...il.com>
Cc:	David Brownell <david-b@...bell.net>,
	Eric Miao <eric.miao@...vell.com>,
	Paulius Zaleckas <paulius.zaleckas@...tonika.lt>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Sam Ravnborg <sam@...nborg.org>,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-fbdev-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, linux-embedded@...r.kernel.org
Subject: Re: [RFC 2.6.28 1/3] gpiolib: add batch set/get

Hello Jaya,

On Sun, Jan 25, 2009 at 05:54:47PM +0800, Jaya Kumar wrote:
> - split the patches into generic, arch specific and am300epd
I would swap the order to have:

	generic
	am300epd
	pxa specific

This way the tree of the second commit is a test case for the generic
implementation.

> - adjusting the API to remove width (note, the actual API call where
>   width was dropped is in the arch specific code, not here.)
Nevertheless I would document the "generic" per arch specific
implementation in gpio.txt.  For the functions like __gpio_get_value you
can just do

	#define gpio_get_value(gpio) __gpio_get_value(gpio)

but for your batch functions you need something like

	#define gpio_set_batch(startpin, mask, values) \
		({ u32 __mask = mask; __gpio_set_batch(startpin, __mask, fls(__mask), values);})

Maybe better use/recommend an inline function?

> Cc: David Brownell <david-b@...bell.net>
> Cc: Eric Miao <eric.miao@...vell.com>
> Cc: Paulius Zaleckas <paulius.zaleckas@...tonika.lt>
> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: Sam Ravnborg <sam@...nborg.org>
> Cc: linux-arm-kernel@...ts.arm.linux.org.uk
> Cc: linux-fbdev-devel@...ts.sourceforge.net
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-embedded@...r.kernel.org
> Signed-off-by: Jaya Kumar <jayakumar.lkml@...il.com>
Note you didn't Cc: me.

-- 
Pengutronix e.K.                              | Uwe Kleine-König            |
Industrial Linux Solutions                    | http://www.pengutronix.de/  |
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