0000 #ˆl–Ü4ý(© ³( Å €fàD¦-ÿà „i÷žgÀÆ?÷# SPDX-License-Identifier: GPL-2.0-only # # GPIO infrastructure and drivers # menuconfig GPIOLIB bool "GPIO Support" 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 OF_GPIO_MM_GPIOCHIP bool help This adds support for the legacy 'struct of_mm_gpio_chip' interface from PowerPC. Existing drivers using this interface need to select this symbol, but new drivers should use the generic gpio-regmap infrastructure instead. 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)" if EXPERT depends on SYSFS select GPIO_CDEV # We need to encourage the new ABI help Say Y here to add the legacy sysfs interface for GPIOs. This ABI is deprecated. If you want to use GPIO from userspace, use the character device /dev/gpiochipN with the appropriate ioctl() operations instead. config GPIO_CDEV bool prompt "Character device (/dev/gpiochipN) support" if EXPERT default y help Say Y here to add the character device /dev/gpiochipN interface for GPIOs. The character device allows userspace to control GPIOs using ioctl() operations. Only say N if you are sure that the GPIO character device is not required. If unsure, say Y. config GPIO_CDEV_V1 bool "Support GPIO ABI Version 1" default y depends on GPIO_CDEV help Say Y here to support version 1 of the GPIO CDEV ABI. This ABI version is deprecated. Please use the latest ABI for new developments. If unsure, say Y. config GPIO_GENERIC depends on HAS_IOMEM # Only for IOMEM drivers tristate config GPIO_REGMAP select REGMAP 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 select OF_GPIO_MM_GPIOCHIP 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. Requires ACPI ASL code to enumerate as a platform device. config GPIO_ASPEED tristate "Aspeed GPIO suppor