linux-kernel - Re: [PATCH v2] gpio: devm_gpio_* support should not depend on GPIOLIB

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Message-ID: <20130213133749.GA13464@r65073-Latitude-E6420>
Date:	Wed, 13 Feb 2013 21:37:52 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Max Filippov <jcmvbkbc@...il.com>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	<linux-next@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] gpio: devm_gpio_* support should not depend on GPIOLIB

Sorry for the late response due to Chinese New Year Holidays here.

On Sun, Feb 10, 2013 at 07:46:30AM +0300, Max Filippov wrote:
> On Sat, Jan 19, 2013 at 2:33 AM, Linus Walleij <linus.walleij@...aro.org> wrote:
> > On Fri, Jan 18, 2013 at 8:57 AM, Shawn Guo <shawn.guo@...aro.org> wrote:
> >
> >> Some architectures (e.g. blackfin) provide gpio API without requiring
> >> GPIOLIB support (ARCH_WANT_OPTIONAL_GPIOLIB).  devm_gpio_* functions
> >> should also work for these architectures, since they do not really
> >> depend on GPIOLIB.
> >>
> >> Add a new option GPIO_DEVRES (enabled by default) to control the build
> >> of devres.c.  It also removes the empty version of devm_gpio_*
> >> functions for !GENERIC_GPIO build from linux/gpio.h, and moves the
> >> function declarations from asm-generic/gpio.h into linux/gpio.h.
> >>
> >> Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
> >
> > OK I removed the old version of the patch and pushed this instead.
> 
> Hi,
> 
> this patch causes the following errors for xtensa defconfig build:
> 
I assume this is a build of arch/xtensa/common_defconfig.

> include/asm-generic/gpio.h:265:2: error: implicit declaration of
> function '__gpio_get_value' [-Werror=implicit-function-declaration]
> include/asm-generic/gpio.h:271:2: error: implicit declaration of
> function '__gpio_set_value' [-Werror=implicit-function-declaration]
> include/linux/gpio.h:60:90: error: redefinition of 'gpio_cansleep'
> include/linux/gpio.h:62:2: error: implicit declaration of function
> '__gpio_cansleep' [-Werror=implicit-function-declaration]
> include/linux/gpio.h:67:2: error: implicit declaration of function
> '__gpio_to_irq' [-Werror=implicit-function-declaration]
> drivers/gpio/devres.c:26:2: error: implicit declaration of function
> 'gpio_free' [-Werror=implicit-function-declaration]
> drivers/gpio/devres.c:60:2: error: implicit declaration of function
> 'gpio_request' [-Werror=implicit-function-declaration]
> drivers/gpio/devres.c:90:2: error: implicit declaration of function
> 'gpio_request_one' [-Werror=implicit-function-declaration]
> 
I'm not sure why GENERIC_GPIO is needed for this build at all.  At
least, with the change below, everything seems building fine with
common_defconfig.

Shawn

diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 13358e1..cfc41f3 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -31,9 +31,6 @@ config RWSEM_XCHGADD_ALGORITHM
 config GENERIC_HWEIGHT
        def_bool y
 
-config GENERIC_GPIO
-       def_bool y
-
 config ARCH_HAS_ILOG2_U32
        def_bool n
 


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