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| author | David Brownell <dbrownell@users.sourceforge.net> | 2008-02-04 22:28:17 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-05 09:44:12 -0800 |
| commit | a9c5fff542544c8595bb12efeb278a96d99386fc (patch) | |
| tree | 28683c259e73f2f74d140b29ac3a9c3c1491e7a3 /drivers/gpio | |
| parent | 99c84dbdc73d158a1ab955a4a5f74c18074796a3 (diff) | |
| download | linux-a9c5fff542544c8595bb12efeb278a96d99386fc.tar.gz linux-a9c5fff542544c8595bb12efeb278a96d99386fc.tar.bz2 linux-a9c5fff542544c8595bb12efeb278a96d99386fc.zip | |
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: 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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/Kconfig | 32 | ||||
| -rw-r--r-- | drivers/gpio/Makefile | 4 |
2 files changed, 36 insertions, 0 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig new file mode 100644 index 000000000000..560687c4667e --- /dev/null +++ b/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 --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile new file mode 100644 index 000000000000..369e4fc432e3 --- /dev/null +++ b/drivers/gpio/Makefile @@ -0,0 +1,4 @@ +# gpio support: dedicated expander chips, etc + +ccflags-$(CONFIG_DEBUG_GPIO) += -DDEBUG + |