From: David Brownell <[EMAIL PROTECTED]> Add an empty drivers/gpio directory for gpiolib infrastructure and GPIO expanders. It is populated by subsequent 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 <[EMAIL PROTECTED]> Acked-by: Jean Delvare <[EMAIL PROTECTED]> Cc: Eric Miao <[EMAIL PROTECTED]> --- arch/arm/Kconfig | 2 ++ drivers/Kconfig | 2 ++ drivers/Makefile | 1 + drivers/gpio/Kconfig | 32 ++++++++++++++++++++++++++++++++ drivers/gpio/Makefile | 6 ++++++ 5 files changed, 43 insertions(+) --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1040,6 +1040,8 @@ source "drivers/i2c/Kconfig" source "drivers/spi/Kconfig" +source "drivers/gpio/Kconfig" + source "drivers/w1/Kconfig" source "drivers/power/Kconfig" --- a/drivers/Kconfig +++ b/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" --- a/drivers/Makefile +++ b/drivers/Makefile @@ -5,6 +5,7 @@ # Rewritten to use lists instead of if-statements. # +obj-$(CONFIG_GPIO_LIB) += gpio/ obj-$(CONFIG_PCI) += pci/ obj-$(CONFIG_PARISC) += parisc/ obj-$(CONFIG_RAPIDIO) += rapidio/ --- /dev/null +++ b/drivers/gpio/Kconfig @@ -0,0 +1,32 @@ +# +# GPIO infrastructure and expanders +# + +config 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 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 --- /dev/null +++ b/drivers/gpio/Makefile @@ -0,0 +1,6 @@ +# gpio support: dedicated expander chips, etc + +ifeq ($(CONFIG_DEBUG_GPIO),y) +EXTRA_CFLAGS += -DDEBUG +endif + -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
