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linux-vybrid_pu...
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drivers
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gpio
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Kconfig

Kconfig 2.2 KB
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  1. #
    2. 

  2. # GPIO infrastructure and expanders
    3. 

  3. #
    4. 

  4. 

  5. config HAVE_GPIO_LIB
    6. 

  6. 	bool
    7. 

  7. 	help
    8. 

  8. 	  Platforms select gpiolib if they use this infrastructure
    9. 

  9. 	  for all their GPIOs, usually starting with ones integrated
    10. 

  10. 	  into SOC processors.
    11. 

  11. 

  12. menu "GPIO Support"
    13. 

  13. 	depends on HAVE_GPIO_LIB
    14. 

  14. 

  15. config DEBUG_GPIO
    16. 

  16. 	bool "Debug GPIO calls"
    17. 

  17. 	depends on DEBUG_KERNEL
    18. 

  18. 	help
    19. 

  19. 	  Say Y here to add some extra checks and diagnostics to GPIO calls.
    20. 

  20. 	  The checks help ensure that GPIOs have been properly initialized
    21. 

  21. 	  before they are used and that sleeping calls aren not made from
    22. 

  22. 	  nonsleeping contexts.  They can make bitbanged serial protocols
    23. 

  23. 	  slower.  The diagnostics help catch the type of setup errors
    24. 

  24. 	  that are most common when setting up new platforms or boards.
    25. 

  25. 

  26. # put expanders in the right section, in alphabetical order
    27. 

  27. 

  28. comment "I2C GPIO expanders:"
    29. 

  29. 

  30. config GPIO_PCA9539
    31. 

  31. 	tristate "PCA9539 16-bit I/O port"
    32. 

  32. 	depends on I2C
    33. 

  33. 	help
    34. 

  34. 	  Say yes here to support the PCA9539 16-bit I/O port. These
    35. 

  35. 	  parts are made by NXP and TI.
    36. 

  36. 

  37. 	  This driver can also be built as a module.  If so, the module
    38. 

  38. 	  will be called pca9539.
    39. 

  39. 

  40. config GPIO_PCF857X
    41. 

  41. 	tristate "PCF857x, PCA857x, and PCA967x I2C GPIO expanders"
    42. 

  42. 	depends on I2C
    43. 

  43. 	help
    44. 

  44. 	  Say yes here to provide access to most "quasi-bidirectional" I2C
    45. 

  45. 	  GPIO expanders used for additional digital outputs or inputs.
    46. 

  46. 	  Most of these parts are from NXP, though TI is a second source for
    47. 

  47. 	  some of them.  Compatible models include:
    48. 

  48. 

  49. 	  8 bits:   pcf8574, pcf8574a, pca8574, pca8574a,
    50. 

  50. 	            pca9670, pca9672, pca9674, pca9674a
    51. 

  51. 

  52. 	  16 bits:  pcf8575, pcf8575c, pca8575,
    53. 

  53. 	            pca9671, pca9673, pca9675
    54. 

  54. 

  55. 	  Your board setup code will need to declare the expanders in
    56. 

  56. 	  use, and assign numbers to the GPIOs they expose.  Those GPIOs
    57. 

  57. 	  can then be used from drivers and other kernel code, just like
    58. 

  58. 	  other GPIOs, but only accessible from task contexts.
    59. 

  59. 

  60. 	  This driver provides an in-kernel interface to those GPIOs using
    61. 

  61. 	  platform-neutral GPIO calls.
    62. 

  62. 

  63. comment "SPI GPIO expanders:"
    64. 

  64. 

  65. config GPIO_MCP23S08
    66. 

  66. 	tristate "Microchip MCP23S08 I/O expander"
    67. 

  67. 	depends on SPI_MASTER
    68. 

  68. 	help
    69. 

  69. 	  SPI driver for Microchip MCP23S08 I/O expander.  This provides
    70. 

  70. 	  a GPIO interface supporting inputs and outputs.
    71. 

  71. 

  72. endmenu
    73.