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 comment "Memory mapped GPIO expanders:"
  69
  70 config GPIO_PL061
  71         bool "PrimeCell PL061 GPIO support"
  72         depends on ARM_AMBA
  73         help
  74           Say yes here to support the PrimeCell PL061 GPIO device
  75
  76 config GPIO_XILINX
  77         bool "Xilinx GPIO support"
  78         depends on PPC_OF || MICROBLAZE
  79         help
  80           Say yes here to support the Xilinx FPGA GPIO device
  81
  82 config GPIO_VR41XX
  83         tristate "NEC VR4100 series General-purpose I/O Uint support"
  84         depends on CPU_VR41XX
  85         help
  86           Say yes here to support the NEC VR4100 series General-purpose I/O Uint
  87
  88 comment "I2C GPIO expanders:"
  89
  90 config GPIO_MAX732X
  91         tristate "MAX7319, MAX7320-7327 I2C Port Expanders"
  92         depends on I2C
  93         help
  94           Say yes here to support the MAX7319, MAX7320-7327 series of I2C
  95           Port Expanders. Each IO port on these chips has a fixed role of
  96           Input (designated by 'I'), Push-Pull Output ('O'), or Open-Drain
  97           Input and Output (designed by 'P'). The combinations are listed
  98           below:
  99
 100           8 bits:       max7319 (8I), max7320 (8O), max7321 (8P),
 101                         max7322 (4I4O), max7323 (4P4O)
 102
 103           16 bits:      max7324 (8I8O), max7325 (8P8O),
 104                         max7326 (4I12O), max7327 (4P12O)
 105
 106           Board setup code must specify the model to use, and the start
 107           number for these GPIOs.
 108
 109 config GPIO_PCA953X
 110         tristate "PCA953x, PCA955x, TCA64xx, and MAX7310 I/O ports"
 111         depends on I2C
 112         help
 113           Say yes here to provide access to several register-oriented
 114           SMBus I/O expanders, made mostly by NXP or TI.  Compatible
 115           models include:
 116
 117           4 bits:       pca9536, pca9537
 118
 119           8 bits:       max7310, pca9534, pca9538, pca9554, pca9557,
 120                         tca6408
 121
 122           16 bits:      pca9535, pca9539, pca9555, tca6416
 123
 124           This driver can also be built as a module.  If so, the module
 125           will be called pca953x.
 126
 127 config GPIO_PCF857X
 128         tristate "PCF857x, PCA{85,96}7x, and MAX732[89] I2C GPIO expanders"
 129         depends on I2C
 130         help
 131           Say yes here to provide access to most "quasi-bidirectional" I2C
 132           GPIO expanders used for additional digital outputs or inputs.
 133           Most of these parts are from NXP, though TI is a second source for
 134           some of them.  Compatible models include:
 135
 136           8 bits:   pcf8574, pcf8574a, pca8574, pca8574a,
 137                     pca9670, pca9672, pca9674, pca9674a,
 138                     max7328, max7329
 139
 140           16 bits:  pcf8575, pcf8575c, pca8575,
 141                     pca9671, pca9673, pca9675
 142
 143           Your board setup code will need to declare the expanders in
 144           use, and assign numbers to the GPIOs they expose.  Those GPIOs
 145           can then be used from drivers and other kernel code, just like
 146           other GPIOs, but only accessible from task contexts.
 147
 148           This driver provides an in-kernel interface to those GPIOs using
 149           platform-neutral GPIO calls.
 150
 151 config GPIO_TWL4030
 152         tristate "TWL4030, TWL5030, and TPS659x0 GPIOs"
 153         depends on TWL4030_CORE
 154         help
 155           Say yes here to access the GPIO signals of various multi-function
 156           power management chips from Texas Instruments.
 157
 158 config GPIO_WM831X
 159         tristate "WM831x GPIOs"
 160         depends on MFD_WM831X
 161         help
 162           Say yes here to access the GPIO signals of WM831x power management
 163           chips from Wolfson Microelectronics.
 164
 165 comment "PCI GPIO expanders:"
 166
 167 config GPIO_BT8XX
 168         tristate "BT8XX GPIO abuser"
 169         depends on PCI && VIDEO_BT848=n
 170         help
 171           The BT8xx frame grabber chip has 24 GPIO pins than can be abused
 172           as a cheap PCI GPIO card.
 173
 174           This chip can be found on Miro, Hauppauge and STB TV-cards.
 175
 176           The card needs to be physically altered for using it as a
 177           GPIO card. For more information on how to build a GPIO card
 178           from a BT8xx TV card, see the documentation file at
 179           Documentation/bt8xxgpio.txt
 180
 181           If unsure, say N.
 182
 183 comment "SPI GPIO expanders:"
 184
 185 config GPIO_MAX7301
 186         tristate "Maxim MAX7301 GPIO expander"
 187         depends on SPI_MASTER
 188         help
 189           gpio driver for Maxim MAX7301 SPI GPIO expander.
 190
 191 config GPIO_MCP23S08
 192         tristate "Microchip MCP23S08 I/O expander"
 193         depends on SPI_MASTER
 194         help
 195           SPI driver for Microchip MCP23S08 I/O expander.  This provides
 196           a GPIO interface supporting inputs and outputs.
 197
 198 config GPIO_MC33880
 199         tristate "Freescale MC33880 high-side/low-side switch"
 200         depends on SPI_MASTER
 201         help
 202           SPI driver for Freescale MC33880 high-side/low-side switch.
 203           This provides GPIO interface supporting inputs and outputs.
 204
 205 endif