drivers/gpio/Kconfig

   1 #
   2 # GPIO infrastructure and expanders
   3 #
   4
   5 config ARCH_WANT_OPTIONAL_GPIOLIB
   6         bool
   7         help
   8           Select this config option from the architecture Kconfig, if
   9           it is possible to use gpiolib on the architecture, but let the
  10           user decide whether to actually build it or not.
  11           Select this instead of ARCH_REQUIRE_GPIOLIB, if your architecture does
  12           not depend on GPIOs being available, but rather let the user
  13           decide whether he needs it or not.
  14
  15 config ARCH_REQUIRE_GPIOLIB
  16         bool
  17         select GPIOLIB
  18         help
  19           Platforms select gpiolib if they use this infrastructure
  20           for all their GPIOs, usually starting with ones integrated
  21           into SOC processors.
  22           Selecting this from the architecture code will cause the gpiolib
  23           code to always get built in.
  24
  25
  26
  27 menuconfig GPIOLIB
  28         bool "GPIO Support"
  29         depends on ARCH_WANT_OPTIONAL_GPIOLIB || ARCH_REQUIRE_GPIOLIB
  30         select GENERIC_GPIO
  31         help
  32           This enables GPIO support through the generic GPIO library.
  33           You only need to enable this, if you also want to enable
  34           one or more of the GPIO expansion card drivers below.
  35
  36           If unsure, say N.
  37
  38 if GPIOLIB
  39
  40 config DEBUG_GPIO
  41         bool "Debug GPIO calls"
  42         depends on DEBUG_KERNEL
  43         help
  44           Say Y here to add some extra checks and diagnostics to GPIO calls.
  45           These checks help ensure that GPIOs have been properly initialized
  46           before they are used, and that sleeping calls are not made from
  47           non-sleeping contexts.  They can make bitbanged serial protocols
  48           slower.  The diagnostics help catch the type of setup errors
  49           that are most common when setting up new platforms or boards.
  50
  51 config GPIO_SYSFS
  52         bool "/sys/class/gpio/... (sysfs interface)"
  53         depends on SYSFS && EXPERIMENTAL
  54         help
  55           Say Y here to add a sysfs interface for GPIOs.
  56
  57           This is mostly useful to work around omissions in a system's
  58           kernel support.  Those are common in custom and semicustom
  59           hardware assembled using standard kernels with a minimum of
  60           custom patches.  In those cases, userspace code may import
  61           a given GPIO from the kernel, if no kernel driver requested it.
  62
  63           Kernel drivers may also request that a particular GPIO be
  64           exported to userspace; this can be useful when debugging.
  65
  66 # put expanders in the right section, in alphabetical order
  67
  68 config GPIO_MAX730X
  69         tristate
  70
  71 comment "Memory mapped GPIO expanders:"
  72
  73 config GPIO_PL061
  74         bool "PrimeCell PL061 GPIO support"
  75         depends on ARM_AMBA
  76         help
  77           Say yes here to support the PrimeCell PL061 GPIO device
  78
  79 config GPIO_XILINX
  80         bool "Xilinx GPIO support"
  81         depends on PPC_OF || MICROBLAZE
  82         help
  83           Say yes here to support the Xilinx FPGA GPIO device
  84
  85 config GPIO_VR41XX
  86         tristate "NEC VR4100 series General-purpose I/O Uint support"
  87         depends on CPU_VR41XX
  88         help
  89           Say yes here to support the NEC VR4100 series General-purpose I/O Uint
  90
  91 comment "I2C GPIO expanders:"
  92
  93 config GPIO_MAX7300
  94         tristate "Maxim MAX7300 GPIO expander"
  95         depends on I2C
  96         select GPIO_MAX730X
  97         help
  98           GPIO driver for Maxim MAX7301 I2C-based GPIO expander.
  99
 100 config GPIO_MAX732X
 101         tristate "MAX7319, MAX7320-7327 I2C Port Expanders"
 102         depends on I2C
 103         help
 104           Say yes here to support the MAX7319, MAX7320-7327 series of I2C
 105           Port Expanders. Each IO port on these chips has a fixed role of
 106           Input (designated by 'I'), Push-Pull Output ('O'), or Open-Drain
 107           Input and Output (designed by 'P'). The combinations are listed
 108           below:
 109
 110           8 bits:       max7319 (8I), max7320 (8O), max7321 (8P),
 111                         max7322 (4I4O), max7323 (4P4O)
 112
 113           16 bits:      max7324 (8I8O), max7325 (8P8O),
 114                         max7326 (4I12O), max7327 (4P12O)
 115
 116           Board setup code must specify the model to use, and the start
 117           number for these GPIOs.
 118
 119 config GPIO_PCA953X
 120         tristate "PCA953x, PCA955x, TCA64xx, and MAX7310 I/O ports"
 121         depends on I2C
 122         help
 123           Say yes here to provide access to several register-oriented
 124           SMBus I/O expanders, made mostly by NXP or TI.  Compatible
 125           models include:
 126
 127           4 bits:       pca9536, pca9537
 128
 129           8 bits:       max7310, pca9534, pca9538, pca9554, pca9557,
 130                         tca6408
 131
 132           16 bits:      pca9535, pca9539, pca9555, tca6416
 133
 134           This driver can also be built as a module.  If so, the module
 135           will be called pca953x.
 136
 137 config GPIO_PCF857X
 138         tristate "PCF857x, PCA{85,96}7x, and MAX732[89] I2C GPIO expanders"
 139         depends on I2C
 140         help
 141           Say yes here to provide access to most "quasi-bidirectional" I2C
 142           GPIO expanders used for additional digital outputs or inputs.
 143           Most of these parts are from NXP, though TI is a second source for
 144           some of them.  Compatible models include:
 145
 146           8 bits:   pcf8574, pcf8574a, pca8574, pca8574a,
 147                     pca9670, pca9672, pca9674, pca9674a,
 148                     max7328, max7329
 149
 150           16 bits:  pcf8575, pcf8575c, pca8575,
 151                     pca9671, pca9673, pca9675
 152
 153           Your board setup code will need to declare the expanders in
 154           use, and assign numbers to the GPIOs they expose.  Those GPIOs
 155           can then be used from drivers and other kernel code, just like
 156           other GPIOs, but only accessible from task contexts.
 157
 158           This driver provides an in-kernel interface to those GPIOs using
 159           platform-neutral GPIO calls.
 160
 161 config GPIO_TWL4030
 162         tristate "TWL4030, TWL5030, and TPS659x0 GPIOs"
 163         depends on TWL4030_CORE
 164         help
 165           Say yes here to access the GPIO signals of various multi-function
 166           power management chips from Texas Instruments.
 167
 168 config GPIO_WM831X
 169         tristate "WM831x GPIOs"
 170         depends on MFD_WM831X
 171         help
 172           Say yes here to access the GPIO signals of WM831x power management
 173           chips from Wolfson Microelectronics.
 174
 175 config GPIO_ADP5520
 176         tristate "GPIO Support for ADP5520 PMIC"
 177         depends on PMIC_ADP5520
 178         help
 179           This option enables support for on-chip GPIO found
 180           on Analog Devices ADP5520 PMICs.
 181
 182           To compile this driver as a module, choose M here: the module will
 183           be called adp5520-gpio.
 184
 185 config GPIO_ADP5588
 186         tristate "ADP5588 I2C GPIO expander"
 187         depends on I2C
 188         help
 189           This option enables support for 18 GPIOs found
 190           on Analog Devices ADP5588 GPIO Expanders.
 191           To compile this driver as a module, choose M here: the module will be
 192           called adp5588-gpio.
 193
 194 comment "PCI GPIO expanders:"
 195
 196 config GPIO_CS5535
 197         tristate "AMD CS5535/CS5536 GPIO support"
 198         depends on PCI && !CS5535_GPIO
 199         help
 200           The AMD CS5535 and CS5536 southbridges support 28 GPIO pins that
 201           can be used for quite a number of things.  The CS5535/6 is found on
 202           AMD Geode and Lemote Yeeloong devices.
 203
 204           If unsure, say N.
 205
 206 config GPIO_BT8XX
 207         tristate "BT8XX GPIO abuser"
 208         depends on PCI && VIDEO_BT848=n
 209         help
 210           The BT8xx frame grabber chip has 24 GPIO pins than can be abused
 211           as a cheap PCI GPIO card.
 212
 213           This chip can be found on Miro, Hauppauge and STB TV-cards.
 214
 215           The card needs to be physically altered for using it as a
 216           GPIO card. For more information on how to build a GPIO card
 217           from a BT8xx TV card, see the documentation file at
 218           Documentation/bt8xxgpio.txt
 219
 220           If unsure, say N.
 221
 222 config GPIO_LANGWELL
 223         bool "Intel Moorestown Platform Langwell GPIO support"
 224         depends on PCI
 225         help
 226           Say Y here to support Intel Moorestown platform GPIO.
 227
 228 config GPIO_TIMBERDALE
 229         bool "Support for timberdale GPIO IP"
 230         depends on MFD_TIMBERDALE && GPIOLIB && HAS_IOMEM
 231         ---help---
 232         Add support for the GPIO IP in the timberdale FPGA.
 233
 234 comment "SPI GPIO expanders:"
 235
 236 config GPIO_MAX7301
 237         tristate "Maxim MAX7301 GPIO expander"
 238         depends on SPI_MASTER
 239         select GPIO_MAX730X
 240         help
 241           GPIO driver for Maxim MAX7301 SPI-based GPIO expander.
 242
 243 config GPIO_MCP23S08
 244         tristate "Microchip MCP23S08 I/O expander"
 245         depends on SPI_MASTER
 246         help
 247           SPI driver for Microchip MCP23S08 I/O expander.  This provides
 248           a GPIO interface supporting inputs and outputs.
 249
 250 config GPIO_MC33880
 251         tristate "Freescale MC33880 high-side/low-side switch"
 252         depends on SPI_MASTER
 253         help
 254           SPI driver for Freescale MC33880 high-side/low-side switch.
 255           This provides GPIO interface supporting inputs and outputs.
 256
 257 comment "AC97 GPIO expanders:"
 258
 259 config GPIO_UCB1400
 260         bool "Philips UCB1400 GPIO"
 261         depends on UCB1400_CORE
 262         help
 263           This enables support for the Philips UCB1400 GPIO pins.
 264           The UCB1400 is an AC97 audio codec.
 265
 266           To compile this driver as a module, choose M here: the
 267           module will be called ucb1400_gpio.
 268
 269 endif