path: root/drivers/gpio/Kconfig

#
# GPIO infrastructure and drivers
#

config ARCH_HAVE_CUSTOM_GPIO_H
	bool
	help
	  Selecting this config option from the architecture Kconfig allows
	  the architecture to provide a custom asm/gpio.h implementation
	  overriding the default implementations.  New uses of this are
	  strongly discouraged.

menuconfig GPIOLIB
	bool "GPIO Support"
	select ANON_INODES
	help
	  This enables GPIO support through the generic GPIO library.
	  You only need to enable this, if you also want to enable
	  one or more of the GPIO drivers below.

	  If unsure, say N.

if GPIOLIB

config GPIOLIB_FASTPATH_LIMIT
	int "Maximum number of GPIOs for fast path"
	range 32 512
	default 512
	help
	   This adjusts the point at which certain APIs will switch from
	   using a stack allocated buffer to a dynamically allocated buffer.

	   You shouldn't need to change this unless you really need to
	   optimize either stack space or performance. Change this carefully
	   since setting an incorrect value could cause stack corruption.

config OF_GPIO
	def_bool y
	depends on OF
	depends on HAS_IOMEM

config GPIO_ACPI
	def_bool y
	depends on ACPI

config GPIOLIB_IRQCHIP
	select IRQ_DOMAIN
	bool

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.
	  These checks help ensure that GPIOs have been properly initialized
	  before they are used, and that sleeping calls are not made from
	  non-sleeping 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.

config GPIO_SYSFS
	bool "/sys/class/gpio/... (sysfs interface)"
	depends on SYSFS
	help
	  Say Y here to add a sysfs interface for GPIOs.

	  This is mostly useful to work around omissions in a system's
	  kernel support.  Those are common in custom and semicustom
	  hardware assembled using standard kernels with a minimum of
	  custom patches.  In those cases, userspace code may import
	  a given GPIO from the kernel, if no kernel driver requested it.

	  Kernel drivers may also request that a particular GPIO be
	  exported to userspace; this can be useful when debugging.

config GPIO_GENERIC
	depends on HAS_IOMEM # Only for IOMEM drivers
	tristate

# put drivers in the right section, in alphabetical order

# This symbol is selected by both I2C and SPI expanders
config GPIO_MAX730X
	tristate

menu "Memory mapped GPIO drivers"
	depends on HAS_IOMEM

config GPIO_74XX_MMIO
	tristate "GPIO driver for 74xx-ICs with MMIO access"
	depends on OF_GPIO
	select GPIO_GENERIC
	help
	  Say yes here to support GPIO functionality for 74xx-compatible ICs
	  with MMIO access. Compatible models include:
	    1 bit:	741G125 (Input), 741G74 (Output)
	    2 bits:	742G125 (Input), 7474 (Output)
	    4 bits:	74125 (Input), 74175 (Output)
	    6 bits:	74365 (Input), 74174 (Output)
	    8 bits:	74244 (Input), 74273 (Output)
	    16 bits:	741624 (Input), 7416374 (Output)

config GPIO_ALTERA
	tristate "Altera GPIO"
	depends on OF_GPIO
	select GPIOLIB_IRQCHIP
	help
	  Say Y or M here to build support for the Altera PIO device.

	  If driver is built as a module it will be called gpio-altera.

config GPIO_AMDPT
	tristate "AMD Promontory GPIO support"
	depends on ACPI
	select GPIO_GENERIC
	help
	  driver for GPIO functionality on Promontory IOHub
	  Require ACPI ASL code to enumerate as a platform device.

config GPIO_ASPEED
	tristate "Aspeed GPIO support"
	depends on (ARCH_ASPEED || COMPILE_TEST) && OF_GPIO
	select GPIOLIB_IRQCHIP
	help
	  Say Y here to support Aspeed AST2400 and AST2500 GPIO controllers.

config GPIO_ATH79
	tristate "Atheros AR71XX/AR724X/AR913X GPIO support"
	default y if ATH79
	depends on ATH79 || COMPILE_TEST
	select GPIO_GENERIC
	select GPIOLIB_IRQCHIP
	help
	  Select this option to enable GPIO driver for
	  Atheros AR71XX/AR724X/AR913X SoC devices.

config GPIO_RASPBERRYPI_EXP
	tristate "Raspberry Pi 3 GPIO Expander"
	default RASPBERRYPI_FIRMWARE
	depends on OF_GPIO
	# Make sure not 'y' when RASPBERRYPI_FIRMWARE is 'm'. This can only
	# happen when COMPILE_TEST=y, hence the added !RASPBERRYPI_FIRMWARE.
	depends on (ARCH_BCM2835 && RASPBERRYPI_FIRMWARE) || (COMPILE_TEST && !RASPBERRYPI_FIRMWARE)
	help
	  Turn on GPIO support for the expander on Raspberry Pi 3 boards, using
	  the firmware mailbox to communicate with VideoCore on BCM283x chips.

config GPIO_BCM_KONA
	bool "Broadcom Kona GPIO"
	depends on OF_GPIO && (ARCH_BCM_MOBILE || COMPILE_TEST)
	help
	  Turn on GPIO support for Broadcom "Kona" chips.

config GPIO_BRCMSTB
	tristate "BRCMSTB GPIO support"
	default y if (ARCH_BRCMSTB || BMIPS_GENERIC)
	depends on OF_GPIO && (ARCH_BRCMSTB