2 # GPIO infrastructure and drivers
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 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 drivers in the right section, in alphabetical order
71 comment "Memory mapped GPIO drivers:"
73 config GPIO_BASIC_MMIO
74 tristate "Basic memory-mapped GPIO controllers support"
76 Say yes here to support basic memory-mapped GPIO controllers.
79 tristate "IT8761E GPIO support"
81 Say yes here to support GPIO functionality of IT8761E super I/O chip.
84 bool "PrimeCell PL061 GPIO support"
87 Say yes here to support the PrimeCell PL061 GPIO device
90 bool "Xilinx GPIO support"
91 depends on PPC_OF || MICROBLAZE
93 Say yes here to support the Xilinx FPGA GPIO device
96 tristate "NEC VR4100 series General-purpose I/O Uint support"
99 Say yes here to support the NEC VR4100 series General-purpose I/O Uint
102 tristate "Intel SCH/TunnelCreek GPIO"
103 depends on PCI && X86
107 Say yes here to support GPIO interface on Intel Poulsbo SCH
108 or Intel Tunnel Creek processor.
109 The Intel SCH contains a total of 14 GPIO pins. Ten GPIOs are
110 powered by the core power rail and are turned off during sleep
111 modes (S3 and higher). The remaining four GPIOs are powered by
112 the Intel SCH suspend power supply. These GPIOs remain
113 active during S3. The suspend powered GPIOs can be used to wake the
114 system from the Suspend-to-RAM state.
115 The Intel Tunnel Creek processor has 5 GPIOs powered by the
116 core power rail and 9 from suspend power supply.
118 This driver can also be built as a module. If so, the module
119 will be called sch-gpio.
122 tristate "VIA VX855/VX875 GPIO"
123 depends on MFD_SUPPORT && PCI
127 Support access to the VX855/VX875 GPIO lines through the gpio library.
129 This driver provides common support for accessing the device,
130 additional drivers must be enabled in order to use the
131 functionality of the device.
133 comment "I2C GPIO expanders:"
136 tristate "Maxim MAX7300 GPIO expander"
140 GPIO driver for Maxim MAX7301 I2C-based GPIO expander.
143 tristate "MAX7319, MAX7320-7327 I2C Port Expanders"
146 Say yes here to support the MAX7319, MAX7320-7327 series of I2C
147 Port Expanders. Each IO port on these chips has a fixed role of
148 Input (designated by 'I'), Push-Pull Output ('O'), or Open-Drain
149 Input and Output (designed by 'P'). The combinations are listed
152 8 bits: max7319 (8I), max7320 (8O), max7321 (8P),
153 max7322 (4I4O), max7323 (4P4O)
155 16 bits: max7324 (8I8O), max7325 (8P8O),
156 max7326 (4I12O), max7327 (4P12O)
158 Board setup code must specify the model to use, and the start
159 number for these GPIOs.
161 config GPIO_MAX732X_IRQ
162 bool "Interrupt controller support for MAX732x"
163 depends on GPIO_MAX732X=y && GENERIC_HARDIRQS
165 Say yes here to enable the max732x to be used as an interrupt
166 controller. It requires the driver to be built in the kernel.
169 tristate "PCA953x, PCA955x, TCA64xx, and MAX7310 I/O ports"
172 Say yes here to provide access to several register-oriented
173 SMBus I/O expanders, made mostly by NXP or TI. Compatible
176 4 bits: pca9536, pca9537
178 8 bits: max7310, pca9534, pca9538, pca9554, pca9557,
181 16 bits: pca9535, pca9539, pca9555, tca6416
183 This driver can also be built as a module. If so, the module
184 will be called pca953x.
186 config GPIO_PCA953X_IRQ
187 bool "Interrupt controller support for PCA953x"
188 depends on GPIO_PCA953X=y
190 Say yes here to enable the pca953x to be used as an interrupt
191 controller. It requires the driver to be built in the kernel.
194 tristate "PCF857x, PCA{85,96}7x, and MAX732[89] I2C GPIO expanders"
197 Say yes here to provide access to most "quasi-bidirectional" I2C
198 GPIO expanders used for additional digital outputs or inputs.
199 Most of these parts are from NXP, though TI is a second source for
200 some of them. Compatible models include:
202 8 bits: pcf8574, pcf8574a, pca8574, pca8574a,
203 pca9670, pca9672, pca9674, pca9674a,
206 16 bits: pcf8575, pcf8575c, pca8575,
207 pca9671, pca9673, pca9675
209 Your board setup code will need to declare the expanders in
210 use, and assign numbers to the GPIOs they expose. Those GPIOs
211 can then be used from drivers and other kernel code, just like
212 other GPIOs, but only accessible from task contexts.
214 This driver provides an in-kernel interface to those GPIOs using
215 platform-neutral GPIO calls.
218 bool "Semtech SX150x I2C GPIO expander"
222 Say yes here to provide support for Semtech SX150-series I2C
223 GPIO expanders. Compatible models include:
232 This enables support for the GPIOs found on the STMPE I/O
237 depends on MFD_TC3589X
239 This enables support for the GPIOs found on the TC3589X
243 tristate "TWL4030, TWL5030, and TPS659x0 GPIOs"
244 depends on TWL4030_CORE
246 Say yes here to access the GPIO signals of various multi-function
247 power management chips from Texas Instruments.
250 tristate "WM831x GPIOs"
251 depends on MFD_WM831X
253 Say yes here to access the GPIO signals of WM831x power management
254 chips from Wolfson Microelectronics.
257 tristate "WM8350 GPIOs"
258 depends on MFD_WM8350
260 Say yes here to access the GPIO signals of WM8350 power management
261 chips from Wolfson Microelectronics.
264 tristate "WM8994 GPIOs"
265 depends on MFD_WM8994
267 Say yes here to access the GPIO signals of WM8994 audio hub
268 CODECs from Wolfson Microelectronics.
271 tristate "GPIO Support for ADP5520 PMIC"
272 depends on PMIC_ADP5520
274 This option enables support for on-chip GPIO found
275 on Analog Devices ADP5520 PMICs.
277 To compile this driver as a module, choose M here: the module will
278 be called adp5520-gpio.
281 tristate "ADP5588 I2C GPIO expander"
284 This option enables support for 18 GPIOs found
285 on Analog Devices ADP5588 GPIO Expanders.
286 To compile this driver as a module, choose M here: the module will be
289 config GPIO_ADP5588_IRQ
290 bool "Interrupt controller support for ADP5588"
291 depends on GPIO_ADP5588=y
293 Say yes here to enable the adp5588 to be used as an interrupt
294 controller. It requires the driver to be built in the kernel.
296 comment "PCI GPIO expanders:"
299 tristate "AMD CS5535/CS5536 GPIO support"
300 depends on PCI && X86 && !CS5535_GPIO
302 The AMD CS5535 and CS5536 southbridges support 28 GPIO pins that
303 can be used for quite a number of things. The CS5535/6 is found on
304 AMD Geode and Lemote Yeeloong devices.
309 tristate "BT8XX GPIO abuser"
310 depends on PCI && VIDEO_BT848=n
312 The BT8xx frame grabber chip has 24 GPIO pins than can be abused
313 as a cheap PCI GPIO card.
315 This chip can be found on Miro, Hauppauge and STB TV-cards.
317 The card needs to be physically altered for using it as a
318 GPIO card. For more information on how to build a GPIO card
319 from a BT8xx TV card, see the documentation file at
320 Documentation/bt8xxgpio.txt
325 bool "Intel Langwell/Penwell GPIO support"
326 depends on PCI && X86
328 Say Y here to support Intel Langwell/Penwell GPIO.
331 tristate "PCH GPIO of Intel Topcliff"
332 depends on PCI && X86
334 This driver is for PCH(Platform controller Hub) GPIO of Intel Topcliff
335 which is an IOH(Input/Output Hub) for x86 embedded processor.
336 This driver can access PCH GPIO device.
339 tristate "OKI SEMICONDUCTOR ML7213 IOH GPIO support"
342 ML7213 is companion chip for Intel Atom E6xx series.
343 This driver can be used for OKI SEMICONDUCTOR ML7213 IOH(Input/Output
344 Hub) which is for IVI(In-Vehicle Infotainment) use.
345 This driver can access the IOH's GPIO device.
347 config GPIO_TIMBERDALE
348 bool "Support for timberdale GPIO IP"
349 depends on MFD_TIMBERDALE && HAS_IOMEM
351 Add support for the GPIO IP in the timberdale FPGA.
354 tristate "RDC R-321x GPIO support"
360 Support for the RDC R321x SoC GPIOs over southbridge
361 PCI configuration space.
363 comment "SPI GPIO expanders:"
366 tristate "Maxim MAX7301 GPIO expander"
367 depends on SPI_MASTER
370 GPIO driver for Maxim MAX7301 SPI-based GPIO expander.
373 tristate "Microchip MCP23Sxx I/O expander"
374 depends on SPI_MASTER
376 SPI driver for Microchip MCP23S08/MPC23S17 I/O expanders.
377 This provides a GPIO interface supporting inputs and outputs.
380 tristate "Freescale MC33880 high-side/low-side switch"
381 depends on SPI_MASTER
383 SPI driver for Freescale MC33880 high-side/low-side switch.
384 This provides GPIO interface supporting inputs and outputs.
387 tristate "74x164 serial-in/parallel-out 8-bits shift register"
388 depends on SPI_MASTER
390 Platform driver for 74x164 compatible serial-in/parallel-out
391 8-outputs shift registers. This driver can be used to provide access
392 to more gpio outputs.
394 comment "AC97 GPIO expanders:"
397 bool "Philips UCB1400 GPIO"
398 depends on UCB1400_CORE
400 This enables support for the Philips UCB1400 GPIO pins.
401 The UCB1400 is an AC97 audio codec.
403 To compile this driver as a module, choose M here: the
404 module will be called ucb1400_gpio.
406 comment "MODULbus GPIO expanders:"
409 tristate "Janz VMOD-TTL Digital IO Module"
410 depends on MFD_JANZ_CMODIO
412 This enables support for the Janz VMOD-TTL Digital IO module.
413 This driver provides support for driving the pins in output
414 mode only. Input mode is not supported.
417 bool "ST-Ericsson AB8500 Mixed Signal Circuit gpio functions"
418 depends on AB8500_CORE && BROKEN
420 Select this to enable the AB8500 IC GPIO driver