linux-kernel - Re: + cs553x-gpio-add-amd-cs5535-cs5536-gpio-driver-support-fix-fix.patch added to -mm tree

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Message-ID: <20090412215203.45e2a876@ephemeral>
Date:	Sun, 12 Apr 2009 21:52:03 -0400
From:	Andres Salomon <dilinger@...ued.net>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	akpm@...ux-foundation.org, david-b@...bell.net,
	jordan@...micpenguin.net, katzj@...hat.com, tiwai@...e.de,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: +
 cs553x-gpio-add-amd-cs5535-cs5536-gpio-driver-support-fix-fix.patch added
 to -mm tree

On Fri, 10 Apr 2009 13:00:54 -0700
Randy Dunlap <randy.dunlap@...cle.com> wrote:

> akpm@...ux-foundation.org wrote:
> > The patch titled
> >      cs553x-gpio-add-amd-cs5535-cs5536-gpio-driver-support-fix-fix
> > has been added to the -mm tree.  Its filename is
> >      cs553x-gpio-add-amd-cs5535-cs5536-gpio-driver-support-fix-fix.patch
> > 
> > Before you just go and hit "reply", please:
> >    a) Consider who else should be cc'ed
> >    b) Prefer to cc a suitable mailing list as well
> >    c) Ideally: find the original patch on the mailing list and do a
> >       reply-to-all to that, adding suitable additional cc's
> > 
> > *** Remember to use Documentation/SubmitChecklist when testing your
> > code ***
> > 
> > See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
> > out what to do about this
> > 
> > The current -mm tree may be found at
> > http://userweb.kernel.org/~akpm/mmotm/
> > 
> > ------------------------------------------------------
> > Subject:
> > cs553x-gpio-add-amd-cs5535-cs5536-gpio-driver-support-fix-fix From:
> > Andres Salomon <dilinger@...ued.net>
> > 
> > force GPIO_CS553X to be defined when OLPC is selected
> > 
> > We've begun using the generic GPIO stuff for geodes, so OLPC
> > implicitly depends upon this.  This patch forces selection of it.
> > 
> > Signed-off-by: Andres Salomon <dilinger@...ian.org>
> > Cc: Takashi Iwai <tiwai@...e.de>
> > Cc: Jeremy Katz <katzj@...hat.com>
> > Cc: Jordan Crouse <jordan@...micpenguin.net>
> > Cc: David Brownell <david-b@...bell.net>
> > Cc: Randy Dunlap <randy.dunlap@...cle.com>
> > Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> > ---
> > 
> >  arch/x86/Kconfig         |    1 +
> >  pci/cs5535audio/Makefile |    0 
> >  2 files changed, 1 insertion(+)
> > 
> > diff -puN
> > arch/x86/Kconfig~cs553x-gpio-add-amd-cs5535-cs5536-gpio-driver-support-fix-fix
> > arch/x86/Kconfig ---
> > a/arch/x86/Kconfig~cs553x-gpio-add-amd-cs5535-cs5536-gpio-driver-support-fix-fix
> > +++ a/arch/x86/Kconfig @@ -1972,6 +1972,7 @@ config
> > GEODE_MFGPT_TIMER config OLPC
> >  	bool "One Laptop Per Child support"
> > +	select GPIO_CS553X
> >  	default n
> >  	---help---
> >  	  Add support for detecting the unique features of the OLPC
> 
> 
> In mmotm-2009-0410, this patch causes build errors when GPIOLIB is
> not enabled since GPIO_CS553X uses gpiolib functions & struct fields:
> 
> drivers/gpio/cs553x-gpio.c:23: error: field 'chip' has incomplete type
[...]
> 
> 
> One possible patch is also to select GPIOLIB above in the OLPC config
> block.
> 

Does the following help?  I think this is what we want (gpio-cs553x uses
gpiolib).  I'm a bit unclear how the other gpio drivers get away with
including linux/gpio.h and using gpio_chip without requiring GPIOLIB.
Maybe they implicitly are built on architectures which select
CONFIG_ARCH_REQUIRE_GPIOLIB?




Force GPIO_CS553X to select GPIOLIB, which it makes use of.

Signed-off-by: Andres Salomon <dilinger@...ian.org>

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 797ff45..17d7364 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -148,6 +148,7 @@ comment "PCI GPIO expanders:"
 config GPIO_CS553X
 	tristate "AMD cs5535/cs5536 GPIO support"
 	depends on PCI && !CS5535_GPIO && !MGEODE_LX
+	select GPIOLIB
 	help
 	  The AMD cs5535 and cs5536 southbridges support 28 GPIO pins that
 	  can be used for quite a number of things.  The cs553x is found on
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