drivers/gpio/Kconfig

   1 #
   2 # GPIO infrastructure and expanders
   3 #
   4
   5 config HAVE_GPIO_LIB
   6         bool
   7         help
   8           Platforms select gpiolib if they use this infrastructure
   9           for all their GPIOs, usually starting with ones integrated
  10           into SOC processors.
  11
  12 menu "GPIO Support"
  13         depends on HAVE_GPIO_LIB
  14
  15 config DEBUG_GPIO
  16         bool "Debug GPIO calls"
  17         depends on DEBUG_KERNEL
  18         help
  19           Say Y here to add some extra checks and diagnostics to GPIO calls.
  20           The checks help ensure that GPIOs have been properly initialized
  21           before they are used and that sleeping calls aren not made from
  22           nonsleeping contexts.  They can make bitbanged serial protocols
  23           slower.  The diagnostics help catch the type of setup errors
  24           that are most common when setting up new platforms or boards.
  25
  26 # put expanders in the right section, in alphabetical order
  27
  28 comment "I2C GPIO expanders:"
  29
  30 config GPIO_PCA953X
  31         tristate "PCA953x, PCA955x, and MAX7310 I/O ports"
  32         depends on I2C
  33         help
  34           Say yes here to provide access to several register-oriented
  35           SMBus I/O expanders, made mostly by NXP or TI.  Compatible
  36           models include:
  37
  38           4 bits:       pca9536, pca9537
  39
  40           8 bits:       max7310, pca9534, pca9538, pca9554, pca9557
  41
  42           16 bits:      pca9535, pca9539, pca9555
  43
  44           This driver can also be built as a module.  If so, the module
  45           will be called pca953x.
  46
  47 config GPIO_PCF857X
  48         tristate "PCF857x, PCA857x, and PCA967x I2C GPIO expanders"
  49         depends on I2C
  50         help
  51           Say yes here to provide access to most "quasi-bidirectional" I2C
  52           GPIO expanders used for additional digital outputs or inputs.
  53           Most of these parts are from NXP, though TI is a second source for
  54           some of them.  Compatible models include:
  55
  56           8 bits:   pcf8574, pcf8574a, pca8574, pca8574a,
  57                     pca9670, pca9672, pca9674, pca9674a
  58
  59           16 bits:  pcf8575, pcf8575c, pca8575,
  60                     pca9671, pca9673, pca9675
  61
  62           Your board setup code will need to declare the expanders in
  63           use, and assign numbers to the GPIOs they expose.  Those GPIOs
  64           can then be used from drivers and other kernel code, just like
  65           other GPIOs, but only accessible from task contexts.
  66
  67           This driver provides an in-kernel interface to those GPIOs using
  68           platform-neutral GPIO calls.
  69
  70 comment "SPI GPIO expanders:"
  71
  72 config GPIO_MCP23S08
  73         tristate "Microchip MCP23S08 I/O expander"
  74         depends on SPI_MASTER
  75         help
  76           SPI driver for Microchip MCP23S08 I/O expander.  This provides
  77           a GPIO interface supporting inputs and outputs.
  78
  79 endmenu