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Commit a9c5fff5 authored by David Brownell's avatar David Brownell Committed by Linus Torvalds
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gpiolib: add drivers/gpio directory 



Add an empty drivers/gpio directory for gpiolib infrastructure and GPIO
expanders.  It will be populated by later patches.

This won't be the only place to hold such gpio_chip code.  Many external chips
add a few GPIOs as secondary functionality (such as MFD drivers) and platform
code frequently needs to closely integrate GPIO and IRQ support.

This is placed *early* in the build/link sequence since it's common for other
drivers to depend on GPIOs to do their work, so they must be initialized early
in the device_initcall() sequence.

Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Acked-by: default avatarJean Delvare <khali@linux-fr.org>
Cc: Eric Miao <eric.miao@marvell.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Philipp Zabel <philipp.zabel@gmail.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ben Gardner <bgardner@wabtec.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 99c84dbd

arch/arm/Kconfig

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Original line number Diff line number Diff line
@@ -1122,6 +1122,8 @@ source "drivers/i2c/Kconfig" 


source "drivers/spi/Kconfig"



source "drivers/gpio/Kconfig"



source "drivers/w1/Kconfig"



source "drivers/power/Kconfig"

drivers/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -52,6 +52,8 @@ source "drivers/i2c/Kconfig" 


source "drivers/spi/Kconfig"



source "drivers/gpio/Kconfig"



source "drivers/w1/Kconfig"



source "drivers/power/Kconfig"

drivers/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 
# Rewritten to use lists instead of if-statements.

#



obj-$(CONFIG_HAVE_GPIO_LIB)	+= gpio/

obj-$(CONFIG_PCI)		+= pci/

obj-$(CONFIG_PARISC)		+= parisc/

obj-$(CONFIG_RAPIDIO)		+= rapidio/

drivers/gpio/Kconfig

0 → 100644
+32 −0
Original line number Diff line number Diff line 
#

# GPIO infrastructure and expanders

#



config HAVE_GPIO_LIB

	bool

	help

	  Platforms select gpiolib if they use this infrastructure

	  for all their GPIOs, usually starting with ones integrated

	  into SOC processors.



menu "GPIO Support"

	depends on HAVE_GPIO_LIB



config DEBUG_GPIO

	bool "Debug GPIO calls"

	depends on DEBUG_KERNEL

	help

	  Say Y here to add some extra checks and diagnostics to GPIO calls.

	  The checks help ensure that GPIOs have been properly initialized

	  before they are used and that sleeping calls aren not made from

	  nonsleeping contexts.  They can make bitbanged serial protocols

	  slower.  The diagnostics help catch the type of setup errors

	  that are most common when setting up new platforms or boards.



# put expanders in the right section, in alphabetical order



comment "I2C GPIO expanders:"



comment "SPI GPIO expanders:"



endmenu

drivers/gpio/Makefile

0 → 100644
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# gpio support: dedicated expander chips, etc



ccflags-$(CONFIG_DEBUG_GPIO)	+= -DDEBUG