2 # GPIO infrastructure and expanders
5 config ARCH_WANT_OPTIONAL_GPIOLIB
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.
15 config ARCH_REQUIRE_GPIOLIB
19 Platforms select gpiolib if they use this infrastructure
20 for all their GPIOs, usually starting with ones integrated
22 Selecting this from the architecture code will cause the gpiolib
23 code to always get built in.
29 depends on ARCH_WANT_OPTIONAL_GPIOLIB || ARCH_REQUIRE_GPIOLIB
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.
41 bool "Debug GPIO calls"
42 depends on DEBUG_KERNEL
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.
52 bool "/sys/class/gpio/... (sysfs interface)"
53 depends on SYSFS && EXPERIMENTAL
55 Say Y here to add a sysfs interface for GPIOs.
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.
63 Kernel drivers may also request that a particular GPIO be
64 exported to userspace; this can be useful when debugging.
66 # put expanders in the right section, in alphabetical order
71 comment "Memory mapped GPIO expanders:"
74 tristate "IT8761E GPIO support"
77 Say yes here to support GPIO functionality of IT8761E super I/O chip.
80 bool "PrimeCell PL061 GPIO support"
83 Say yes here to support the PrimeCell PL061 GPIO device
86 bool "Xilinx GPIO support"
87 depends on PPC_OF || MICROBLAZE
89 Say yes here to support the Xilinx FPGA GPIO device
92 tristate "NEC VR4100 series General-purpose I/O Uint support"
95 Say yes here to support the NEC VR4100 series General-purpose I/O Uint
97 comment "I2C GPIO expanders:"
100 tristate "Maxim MAX7300 GPIO expander"
104 GPIO driver for Maxim MAX7301 I2C-based GPIO expander.
107 tristate "MAX7319, MAX7320-7327 I2C Port Expanders"
110 Say yes here to support the MAX7319, MAX7320-7327 series of I2C
111 Port Expanders. Each IO port on these chips has a fixed role of
112 Input (designated by 'I'), Push-Pull Output ('O'), or Open-Drain
113 Input and Output (designed by 'P'). The combinations are listed
116 8 bits: max7319 (8I), max7320 (8O), max7321 (8P),
117 max7322 (4I4O), max7323 (4P4O)
119 16 bits: max7324 (8I8O), max7325 (8P8O),
120 max7326 (4I12O), max7327 (4P12O)
122 Board setup code must specify the model to use, and the start
123 number for these GPIOs.
126 tristate "PCA953x, PCA955x, TCA64xx, and MAX7310 I/O ports"
129 Say yes here to provide access to several register-oriented
130 SMBus I/O expanders, made mostly by NXP or TI. Compatible
133 4 bits: pca9536, pca9537
135 8 bits: max7310, pca9534, pca9538, pca9554, pca9557,
138 16 bits: pca9535, pca9539, pca9555, tca6416
140 This driver can also be built as a module. If so, the module
141 will be called pca953x.
143 config GPIO_PCA953X_IRQ
144 bool "Interrupt controller support for PCA953x"
145 depends on GPIO_PCA953X=y
147 Say yes here to enable the pca953x to be used as an interrupt
148 controller. It requires the driver to be built in the kernel.
151 tristate "PCF857x, PCA{85,96}7x, and MAX732[89] I2C GPIO expanders"
154 Say yes here to provide access to most "quasi-bidirectional" I2C
155 GPIO expanders used for additional digital outputs or inputs.
156 Most of these parts are from NXP, though TI is a second source for
157 some of them. Compatible models include:
159 8 bits: pcf8574, pcf8574a, pca8574, pca8574a,
160 pca9670, pca9672, pca9674, pca9674a,
163 16 bits: pcf8575, pcf8575c, pca8575,
164 pca9671, pca9673, pca9675
166 Your board setup code will need to declare the expanders in
167 use, and assign numbers to the GPIOs they expose. Those GPIOs
168 can then be used from drivers and other kernel code, just like
169 other GPIOs, but only accessible from task contexts.
171 This driver provides an in-kernel interface to those GPIOs using
172 platform-neutral GPIO calls.
175 tristate "TWL4030, TWL5030, and TPS659x0 GPIOs"
176 depends on TWL4030_CORE
178 Say yes here to access the GPIO signals of various multi-function
179 power management chips from Texas Instruments.
182 tristate "WM831x GPIOs"
183 depends on MFD_WM831X
185 Say yes here to access the GPIO signals of WM831x power management
186 chips from Wolfson Microelectronics.
189 tristate "GPIO Support for ADP5520 PMIC"
190 depends on PMIC_ADP5520
192 This option enables support for on-chip GPIO found
193 on Analog Devices ADP5520 PMICs.
195 To compile this driver as a module, choose M here: the module will
196 be called adp5520-gpio.
199 tristate "ADP5588 I2C GPIO expander"
202 This option enables support for 18 GPIOs found
203 on Analog Devices ADP5588 GPIO Expanders.
204 To compile this driver as a module, choose M here: the module will be
207 comment "PCI GPIO expanders:"
210 tristate "AMD CS5535/CS5536 GPIO support"
211 depends on PCI && !CS5535_GPIO
213 The AMD CS5535 and CS5536 southbridges support 28 GPIO pins that
214 can be used for quite a number of things. The CS5535/6 is found on
215 AMD Geode and Lemote Yeeloong devices.
220 tristate "BT8XX GPIO abuser"
221 depends on PCI && VIDEO_BT848=n
223 The BT8xx frame grabber chip has 24 GPIO pins than can be abused
224 as a cheap PCI GPIO card.
226 This chip can be found on Miro, Hauppauge and STB TV-cards.
228 The card needs to be physically altered for using it as a
229 GPIO card. For more information on how to build a GPIO card
230 from a BT8xx TV card, see the documentation file at
231 Documentation/bt8xxgpio.txt
236 bool "Intel Moorestown Platform Langwell GPIO support"
239 Say Y here to support Intel Moorestown platform GPIO.
241 config GPIO_TIMBERDALE
242 bool "Support for timberdale GPIO IP"
243 depends on MFD_TIMBERDALE && GPIOLIB && HAS_IOMEM
245 Add support for the GPIO IP in the timberdale FPGA.
247 comment "SPI GPIO expanders:"
250 tristate "Maxim MAX7301 GPIO expander"
251 depends on SPI_MASTER
254 GPIO driver for Maxim MAX7301 SPI-based GPIO expander.
257 tristate "Microchip MCP23S08 I/O expander"
258 depends on SPI_MASTER
260 SPI driver for Microchip MCP23S08 I/O expander. This provides
261 a GPIO interface supporting inputs and outputs.
264 tristate "Freescale MC33880 high-side/low-side switch"
265 depends on SPI_MASTER
267 SPI driver for Freescale MC33880 high-side/low-side switch.
268 This provides GPIO interface supporting inputs and outputs.
270 comment "AC97 GPIO expanders:"
273 bool "Philips UCB1400 GPIO"
274 depends on UCB1400_CORE
276 This enables support for the Philips UCB1400 GPIO pins.
277 The UCB1400 is an AC97 audio codec.
279 To compile this driver as a module, choose M here: the
280 module will be called ucb1400_gpio.