# # platform-neutral GPIO infrastructure and expanders # config ARCH_WANT_OPTIONAL_GPIOLIB bool help Select this config option from the architecture Kconfig, if it is possible to use gpiolib on the architecture, but let the user decide whether to actually build it or not. Select this instead of ARCH_REQUIRE_GPIOLIB, if your architecture does not depend on GPIOs being available, but rather let the user decide whether he needs it or not. config ARCH_REQUIRE_GPIOLIB bool select GPIOLIB help Platforms select gpiolib if they use this infrastructure for all their GPIOs, usually starting with ones integrated into SOC processors. Selecting this from the architecture code will cause the gpiolib code to always get built in. menuconfig GPIOLIB bool "GPIO Support" depends on ARCH_WANT_OPTIONAL_GPIOLIB || ARCH_REQUIRE_GPIOLIB select GENERIC_GPIO 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 expansion card drivers below. If unsure, say N. if GPIOLIB 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 && EXPERIMENTAL 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. # put expanders in the right section, in alphabetical order config GPIO_MAX730X tristate comment "Memory mapped GPIO expanders:" config GPIO_BASIC_MMIO tristate "Basic memory-mapped GPIO controllers support" help Say yes here to support basic memory-mapped GPIO controllers. config GPIO_IT8761E tristate "IT8761E GPIO support" depends on GPIOLIB help Say yes here to support GPIO functionality of IT8761E super I/O chip. config GPIO_PL061 bool "PrimeCell PL061 GPIO support" depends on ARM_AMBA help Say yes here to support the PrimeCell PL061 GPIO device config GPIO_XILINX bool "Xilinx GPIO support" depends on PPC_OF || MICROBLAZE help Say yes here to support the Xilinx FPGA GPIO device config GPIO_VR41XX tristate "NEC VR4100 series General-purpose I/O Uint support" depends on CPU_VR41XX help Say yes here to support the NEC VR4100 series General-purpose I/O Uint config GPIO_SCH tristate "Intel SCH GPIO" depends on GPIOLIB && PCI select MFD_CORE select LPC_SCH help Say yes here to support GPIO interface on Intel Poulsbo SCH. The Intel SCH contains a total of 14 GPIO pins. Ten GPIOs are powered by the core power rail and are turned off during sleep modes (S3 and higher). The remaining four GPIOs are powered by the Intel SCH suspend power supply. These GPIOs remain active during S3. The suspend powered GPIOs can be used to wake the system from the Suspend-to-RAM state. This driver can also be built as a module. If so, the module will be called sch-gpio. config GPIO_VX855 tristate "VIA VX855/VX875 GPIO" depends on GPIOLIB && MFD_SUPPORT && PCI select MFD_CORE select MFD_VX855 help Support access to the VX855/VX875 GPIO lines through the gpio library. This driver provides common support for accessing the device, additional drivers must be enabled in order to use the functionality of the device. comment "I2C GPIO expanders:" config GPIO_MAX7300 tristate "Maxim MAX7300 GPIO expander" depends on I2C select GPIO_MAX730X help GPIO driver for Maxim MAX7301 I2C-based GPIO expander. config GPIO_MAX732X tristate "MAX7319, MAX7320-7327 I2C Port Expanders" depends on I2C help Say yes here to support the MAX7319, MAX7320-7327 series of I2C Port Expanders. Each IO port on these chips has a fixed role of Input (designated by 'I'), Push-Pull Output ('O'), or Open-Drain Input and Output (designed by 'P'). The combinations are listed below: 8 bits: max7319 (8I), max7320 (8O), max7321 (8P), max7322 (4I4O), max7323 (4P4O) 16 bits: max7324 (8I8O), max7325 (8P8O), max7326 (4I12O), max7327 (4P12O) Board setup code must specify the model to use, and the start number for these GPIOs. config GPIO_MAX732X_IRQ bool "Interrupt controller support for MAX732x" depends on GPIO_MAX732X=y && GENERIC_HARDIRQS help Say yes here to enable the max732x to be used as an interrupt controller. It requires the driver to be built in the kernel. config GPIO_PCA953X tristate "PCA953x, PCA955x, TCA64xx, and MAX7310 I/O ports" depends on I2C help Say yes here to provide access to several register-oriented SMBus I/O expanders, made mostly by NXP or TI. Compatible models include: 4 bits: pca9536, pca9537 8 bits: max7310, pca9534, pca9538, pca9554, pca9557, tca6408 16 bits: pca9535, pca9539, pca9555, tca6416 This driver can also be built as a module. If so, the module will be called pca953x. config GPIO_PCA953X_IRQ bool "Interrupt controller support for PCA953x" depends on GPIO_PCA953X=y help Say yes here to enable the pca953x to be used as an interrupt controller. It requires the driver to be built in the kernel. config GPIO_PCF857X tristate "PCF857x, PCA{85,96}7x, and MAX732[89] I2C GPIO expanders" depends on I2C help Say yes here to provide access to most "quasi-bidirectional" I2C GPIO expanders used for additional digital outputs or inputs. Most of these parts are from NXP, though TI is a second source for some of them. Compatible models include: 8 bits: pcf8574, pcf8574a, pca8574, pca8574a, pca9670, pca9672, pca9674, pca9674a, max7328, max7329 16 bits: pcf8575, pcf8575c, pca8575, pca9671, pca9673, pca9675 Your board setup code will need to declare the expanders in use, and assign numbers to the GPIOs they expose. Those GPIOs can then be used from drivers and other kernel code, just like other GPIOs, but only accessible from task contexts. This driver provides an in-kernel interface to those GPIOs using platform-neutral GPIO calls. config GPIO_SX150X bool "Semtech SX150x I2C GPIO expander" depends on I2C=y default n help Say yes here to provide support for Semtech SX150-series I2C GPIO expanders. Compatible models include: 8 bits: sx1508q 16 bits: sx1509q config GPIO_STMPE bool "STMPE GPIOs" depends on MFD_STMPE help This enables support for the GPIOs found on the STMPE I/O Expanders. config GPIO_TC3589X bool "TC3589X GPIOs" depends on MFD_TC3589X help This enables support for the GPIOs found on the TC3589X I/O Expander. config GPIO_TWL4030 tristate "TWL4030, TWL5030, and TPS659x0 GPIOs" depends on TWL4030_CORE help Say yes here to access the GPIO signals of various multi-function power management chips from Texas Instruments. config GPIO_WM831X tristate "WM831x GPIOs" depends on MFD_WM831X help Say yes here to access the GPIO signals of WM831x power management chips from Wolfson Microelectronics. config GPIO_WM8350 tristate "WM8350 GPIOs" depends on MFD_WM8350 help Say yes here to access the GPIO signals of WM8350 power management chips from Wolfson Microelectronics. config GPIO_WM8994 tristate "WM8994 GPIOs" depends on MFD_WM8994 help Say yes here to access the GPIO signals of WM8994 audio hub CODECs from Wolfson Microelectronics. config GPIO_ADP5520 tristate "GPIO Support for ADP5520 PMIC" depends on PMIC_ADP5520 help This option enables support for on-chip GPIO found on Analog Devices ADP5520 PMICs. To compile this driver as a module, choose M here: the module will be called adp5520-gpio. config GPIO_ADP5588 tristate "ADP5588 I2C GPIO expander" depends on I2C help This option enables support for 18 GPIOs found on Analog Devices ADP5588 GPIO Expanders. To compile this driver as a module, choose M here: the module will be called adp5588-gpio. config GPIO_ADP5588_IRQ bool "Interrupt controller support for ADP5588" depends on GPIO_ADP5588=y help Say yes here to enable the adp5588 to be used as an interrupt controller. It requires the driver to be built in the kernel. comment "PCI GPIO expanders:" config GPIO_CS5535 tristate "AMD CS5535/CS5536 GPIO support" depends on PCI && X86 && !CS5535_GPIO help The AMD CS5535 and CS5536 southbridges support 28 GPIO pins that can be used for quite a number of things. The CS5535/6 is found on AMD Geode and Lemote Yeeloong devices. If unsure, say N. config GPIO_BT8XX tristate "BT8XX GPIO abuser" depends on PCI && VIDEO_BT848=n help The BT8xx frame grabber chip has 24 GPIO pins than can be abused as a cheap PCI GPIO card. This chip can be found on Miro, Hauppauge and STB TV-cards. The card needs to be physically altered for using it as a GPIO card. For more information on how to build a GPIO card from a BT8xx TV card, see the documentation file at Documentation/bt8xxgpio.txt If unsure, say N. config GPIO_LANGWELL bool "Intel Langwell/Penwell GPIO support" depends on PCI help Say Y here to support Intel Langwell/Penwell GPIO. config GPIO_PCH tristate "PCH GPIO of Intel Topcliff" depends on PCI help This driver is for PCH(Platform controller Hub) GPIO of Intel Topcliff which is an IOH(Input/Output Hub) for x86 embedded processor. This driver can access PCH GPIO device. config GPIO_TIMBERDALE bool "Support for timberdale GPIO IP" depends on MFD_TIMBERDALE && GPIOLIB && HAS_IOMEM ---help--- Add support for the GPIO IP in the timberdale FPGA. config GPIO_RDC321X tristate "RDC R-321x GPIO support" depends on PCI && GPIOLIB select MFD_SUPPORT select MFD_CORE select MFD_RDC321X help Support for the RDC R321x SoC GPIOs over southbridge PCI configuration space. comment "SPI GPIO expanders:" config GPIO_MAX7301 tristate "Maxim MAX7301 GPIO expander" depends on SPI_MASTER select GPIO_MAX730X help GPIO driver for Maxim MAX7301 SPI-based GPIO expander. config GPIO_MCP23S08 tristate "Microchip MCP23S08 I/O expander" depends on SPI_MASTER help SPI driver for Microchip MCP23S08 I/O expander. This provides a GPIO interface supporting inputs and outputs. config GPIO_MC33880 tristate "Freescale MC33880 high-side/low-side switch" depends on SPI_MASTER help SPI driver for Freescale MC33880 high-side/low-side switch. This provides GPIO interface supporting inputs and outputs. config GPIO_74X164 tristate "74x164 serial-in/parallel-out 8-bits shift register" depends on SPI_MASTER help Platform driver for 74x164 compatible serial-in/parallel-out 8-outputs shift registers. This driver can be used to provide access to more gpio outputs. comment "AC97 GPIO expanders:" config GPIO_UCB1400 bool "Philips UCB1400 GPIO" depends on UCB1400_CORE help This enables support for the Philips UCB1400 GPIO pins. The UCB1400 is an AC97 audio codec. To compile this driver as a module, choose M here: the module will be called ucb1400_gpio. comment "MODULbus GPIO expanders:" config GPIO_JANZ_TTL tristate "Janz VMOD-TTL Digital IO Module" depends on MFD_JANZ_CMODIO help This enables support for the Janz VMOD-TTL Digital IO module. This driver provides support for driving the pins in output mode only. Input mode is not supported. endif