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
98 tristate "Intel SCH GPIO"
99 depends on GPIOLIB && PCI
103 Say yes here to support GPIO interface on Intel Poulsbo SCH.
104 The Intel SCH contains a total of 14 GPIO pins. Ten GPIOs are
105 powered by the core power rail and are turned off during sleep
106 modes (S3 and higher). The remaining four GPIOs are powered by
107 the Intel SCH suspend power supply. These GPIOs remain
108 active during S3. The suspend powered GPIOs can be used to wake the
109 system from the Suspend-to-RAM state.
111 This driver can also be built as a module. If so, the module
112 will be called sch-gpio.
114 comment "I2C GPIO expanders:"
117 tristate "Maxim MAX7300 GPIO expander"
121 GPIO driver for Maxim MAX7301 I2C-based GPIO expander.
124 tristate "MAX7319, MAX7320-7327 I2C Port Expanders"
127 Say yes here to support the MAX7319, MAX7320-7327 series of I2C
128 Port Expanders. Each IO port on these chips has a fixed role of
129 Input (designated by 'I'), Push-Pull Output ('O'), or Open-Drain
130 Input and Output (designed by 'P'). The combinations are listed
133 8 bits: max7319 (8I), max7320 (8O), max7321 (8P),
134 max7322 (4I4O), max7323 (4P4O)
136 16 bits: max7324 (8I8O), max7325 (8P8O),
137 max7326 (4I12O), max7327 (4P12O)
139 Board setup code must specify the model to use, and the start
140 number for these GPIOs.
142 config GPIO_MAX732X_IRQ
143 bool "Interrupt controller support for MAX732x"
144 depends on GPIO_MAX732X=y && GENERIC_HARDIRQS
146 Say yes here to enable the max732x to be used as an interrupt
147 controller. It requires the driver to be built in the kernel.
150 tristate "PCA953x, PCA955x, TCA64xx, and MAX7310 I/O ports"
153 Say yes here to provide access to several register-oriented
154 SMBus I/O expanders, made mostly by NXP or TI. Compatible
157 4 bits: pca9536, pca9537
159 8 bits: max7310, pca9534, pca9538, pca9554, pca9557,
162 16 bits: pca9535, pca9539, pca9555, tca6416
164 This driver can also be built as a module. If so, the module
165 will be called pca953x.
167 config GPIO_PCA953X_IRQ
168 bool "Interrupt controller support for PCA953x"
169 depends on GPIO_PCA953X=y
171 Say yes here to enable the pca953x to be used as an interrupt
172 controller. It requires the driver to be built in the kernel.
175 tristate "PCF857x, PCA{85,96}7x, and MAX732[89] I2C GPIO expanders"
178 Say yes here to provide access to most "quasi-bidirectional" I2C
179 GPIO expanders used for additional digital outputs or inputs.
180 Most of these parts are from NXP, though TI is a second source for
181 some of them. Compatible models include:
183 8 bits: pcf8574, pcf8574a, pca8574, pca8574a,
184 pca9670, pca9672, pca9674, pca9674a,
187 16 bits: pcf8575, pcf8575c, pca8575,
188 pca9671, pca9673, pca9675
190 Your board setup code will need to declare the expanders in
191 use, and assign numbers to the GPIOs they expose. Those GPIOs
192 can then be used from drivers and other kernel code, just like
193 other GPIOs, but only accessible from task contexts.
195 This driver provides an in-kernel interface to those GPIOs using
196 platform-neutral GPIO calls.
199 tristate "TWL4030, TWL5030, and TPS659x0 GPIOs"
200 depends on TWL4030_CORE
202 Say yes here to access the GPIO signals of various multi-function
203 power management chips from Texas Instruments.
206 tristate "WM831x GPIOs"
207 depends on MFD_WM831X
209 Say yes here to access the GPIO signals of WM831x power management
210 chips from Wolfson Microelectronics.
213 tristate "WM8350 GPIOs"
214 depends on MFD_WM8350
216 Say yes here to access the GPIO signals of WM8350 power management
217 chips from Wolfson Microelectronics.
220 tristate "WM8994 GPIOs"
221 depends on MFD_WM8994
223 Say yes here to access the GPIO signals of WM8994 audio hub
224 CODECs from Wolfson Microelectronics.
227 tristate "GPIO Support for ADP5520 PMIC"
228 depends on PMIC_ADP5520
230 This option enables support for on-chip GPIO found
231 on Analog Devices ADP5520 PMICs.
233 To compile this driver as a module, choose M here: the module will
234 be called adp5520-gpio.
237 tristate "ADP5588 I2C GPIO expander"
240 This option enables support for 18 GPIOs found
241 on Analog Devices ADP5588 GPIO Expanders.
242 To compile this driver as a module, choose M here: the module will be
245 comment "PCI GPIO expanders:"
248 tristate "AMD CS5535/CS5536 GPIO support"
249 depends on PCI && !CS5535_GPIO
251 The AMD CS5535 and CS5536 southbridges support 28 GPIO pins that
252 can be used for quite a number of things. The CS5535/6 is found on
253 AMD Geode and Lemote Yeeloong devices.
258 tristate "BT8XX GPIO abuser"
259 depends on PCI && VIDEO_BT848=n
261 The BT8xx frame grabber chip has 24 GPIO pins than can be abused
262 as a cheap PCI GPIO card.
264 This chip can be found on Miro, Hauppauge and STB TV-cards.
266 The card needs to be physically altered for using it as a
267 GPIO card. For more information on how to build a GPIO card
268 from a BT8xx TV card, see the documentation file at
269 Documentation/bt8xxgpio.txt
274 bool "Intel Moorestown Platform Langwell GPIO support"
277 Say Y here to support Intel Moorestown platform GPIO.
279 config GPIO_TIMBERDALE
280 bool "Support for timberdale GPIO IP"
281 depends on MFD_TIMBERDALE && GPIOLIB && HAS_IOMEM
283 Add support for the GPIO IP in the timberdale FPGA.
285 comment "SPI GPIO expanders:"
288 tristate "Maxim MAX7301 GPIO expander"
289 depends on SPI_MASTER
292 GPIO driver for Maxim MAX7301 SPI-based GPIO expander.
295 tristate "Microchip MCP23S08 I/O expander"
296 depends on SPI_MASTER
298 SPI driver for Microchip MCP23S08 I/O expander. This provides
299 a GPIO interface supporting inputs and outputs.
302 tristate "Freescale MC33880 high-side/low-side switch"
303 depends on SPI_MASTER
305 SPI driver for Freescale MC33880 high-side/low-side switch.
306 This provides GPIO interface supporting inputs and outputs.
308 comment "AC97 GPIO expanders:"
311 bool "Philips UCB1400 GPIO"
312 depends on UCB1400_CORE
314 This enables support for the Philips UCB1400 GPIO pins.
315 The UCB1400 is an AC97 audio codec.
317 To compile this driver as a module, choose M here: the
318 module will be called ucb1400_gpio.