| # | |
| # 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_PCA953X | |
| tristate "PCA953x I/O ports" | |
| depends on I2C | |
| help | |
| Say yes here to support the PCA9534 (8-bit), PCA9535 (16-bit), | |
| PCA9536 (4-bit), PCA9537 (4-bit), PCA9538 (8-bit), and PCA9539 | |
| (16-bit) I/O ports. These parts are made by NXP and TI. | |
| This driver can also be built as a module. If so, the module | |
| will be called pca953x. | |
| 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 |