From: David Brownell <dbrownell@users.sourceforge.net>

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: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Jean 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: Andrew Morton <akpm@linux-foundation.org>
---

 arch/arm/Kconfig      |    2 ++
 drivers/Kconfig       |    2 ++
 drivers/Makefile      |    1 +
 drivers/gpio/Kconfig  |   32 ++++++++++++++++++++++++++++++++
 drivers/gpio/Makefile |    4 ++++
 5 files changed, 41 insertions(+)

diff -puN arch/arm/Kconfig~gpiolib-add-drivers-gpio-directory arch/arm/Kconfig
--- a/arch/arm/Kconfig~gpiolib-add-drivers-gpio-directory
+++ a/arch/arm/Kconfig
@@ -1097,6 +1097,8 @@ source "drivers/i2c/Kconfig"
 
 source "drivers/spi/Kconfig"
 
+source "drivers/gpio/Kconfig"
+
 source "drivers/w1/Kconfig"
 
 source "drivers/power/Kconfig"
diff -puN drivers/Kconfig~gpiolib-add-drivers-gpio-directory drivers/Kconfig
--- a/drivers/Kconfig~gpiolib-add-drivers-gpio-directory
+++ a/drivers/Kconfig
@@ -52,6 +52,8 @@ source "drivers/i2c/Kconfig"
 
 source "drivers/spi/Kconfig"
 
+source "drivers/gpio/Kconfig"
+
 source "drivers/w1/Kconfig"
 
 source "drivers/power/Kconfig"
diff -puN drivers/Makefile~gpiolib-add-drivers-gpio-directory drivers/Makefile
--- a/drivers/Makefile~gpiolib-add-drivers-gpio-directory
+++ a/drivers/Makefile
@@ -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/
diff -puN /dev/null drivers/gpio/Kconfig
--- /dev/null
+++ a/drivers/gpio/Kconfig
@@ -0,0 +1,32 @@
+#
+# 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
diff -puN /dev/null drivers/gpio/Makefile
--- /dev/null
+++ a/drivers/gpio/Makefile
@@ -0,0 +1,4 @@
+# gpio support: dedicated expander chips, etc
+
+ccflags-$(CONFIG_DEBUG_GPIO)	+= -DDEBUG
+
_