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Diffstat (limited to 'drivers/gpio/Kconfig')
| -rw-r--r-- | drivers/gpio/Kconfig | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig new file mode 100644 index 00000000000..74fac0f5c34 --- /dev/null +++ b/drivers/gpio/Kconfig @@ -0,0 +1,72 @@ +# +# GPIO infrastructure and expanders +# + +config HAVE_GPIO_LIB + bool + help + Platforms select gpiolib if they use this infrastructure + for all their GPIOs, usually starting with ones integrated + into SOC processors. + +menu "GPIO Support" + depends on HAVE_GPIO_LIB + +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. + The checks help ensure that GPIOs have been properly initialized + before they are used and that sleeping calls aren not made from + nonsleeping 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. + +# put expanders in the right section, in alphabetical order + +comment "I2C GPIO expanders:" + +config GPIO_PCA9539 + tristate "PCA9539 16-bit I/O port" + depends on I2C + help + Say yes here to support the PCA9539 16-bit I/O port. These + parts are made by NXP and TI. + + This driver can also be built as a module. If so, the module + will be called pca9539. + +config GPIO_PCF857X + tristate "PCF857x, PCA857x, and PCA967x 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 + + 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. + +comment "SPI GPIO expanders:" + +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. + +endmenu |