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.
143 tristate "PCA953x, PCA955x, TCA64xx, and MAX7310 I/O ports"
146 Say yes here to provide access to several register-oriented
147 SMBus I/O expanders, made mostly by NXP or TI. Compatible
150 4 bits: pca9536, pca9537
152 8 bits: max7310, pca9534, pca9538, pca9554, pca9557,
155 16 bits: pca9535, pca9539, pca9555, tca6416
157 This driver can also be built as a module. If so, the module
158 will be called pca953x.
160 config GPIO_PCA953X_IRQ
161 bool "Interrupt controller support for PCA953x"
162 depends on GPIO_PCA953X=y
164 Say yes here to enable the pca953x to be used as an interrupt
165 controller. It requires the driver to be built in the kernel.
168 tristate "PCF857x, PCA{85,96}7x, and MAX732[89] I2C GPIO expanders"
171 Say yes here to provide access to most "quasi-bidirectional" I2C
172 GPIO expanders used for additional digital outputs or inputs.
173 Most of these parts are from NXP, though TI is a second source for
174 some of them. Compatible models include:
176 8 bits: pcf8574, pcf8574a, pca8574, pca8574a,
177 pca9670, pca9672, pca9674, pca9674a,
180 16 bits: pcf8575, pcf8575c, pca8575,
181 pca9671, pca9673, pca9675
183 Your board setup code will need to declare the expanders in
184 use, and assign numbers to the GPIOs they expose. Those GPIOs
185 can then be used from drivers and other kernel code, just like
186 other GPIOs, but only accessible from task contexts.
188 This driver provides an in-kernel interface to those GPIOs using
189 platform-neutral GPIO calls.
192 tristate "TWL4030, TWL5030, and TPS659x0 GPIOs"
193 depends on TWL4030_CORE
195 Say yes here to access the GPIO signals of various multi-function
196 power management chips from Texas Instruments.
199 tristate "WM831x GPIOs"
200 depends on MFD_WM831X
202 Say yes here to access the GPIO signals of WM831x power management
203 chips from Wolfson Microelectronics.
206 tristate "WM8350 GPIOs"
207 depends on MFD_WM8350
209 Say yes here to access the GPIO signals of WM8350 power management
210 chips from Wolfson Microelectronics.
213 tristate "WM8994 GPIOs"
214 depends on MFD_WM8994
216 Say yes here to access the GPIO signals of WM8994 audio hub
217 CODECs from Wolfson Microelectronics.
220 tristate "GPIO Support for ADP5520 PMIC"
221 depends on PMIC_ADP5520
223 This option enables support for on-chip GPIO found
224 on Analog Devices ADP5520 PMICs.
226 To compile this driver as a module, choose M here: the module will
227 be called adp5520-gpio.
230 tristate "ADP5588 I2C GPIO expander"
233 This option enables support for 18 GPIOs found
234 on Analog Devices ADP5588 GPIO Expanders.
235 To compile this driver as a module, choose M here: the module will be
238 comment "PCI GPIO expanders:"
241 tristate "AMD CS5535/CS5536 GPIO support"
242 depends on PCI && !CS5535_GPIO
244 The AMD CS5535 and CS5536 southbridges support 28 GPIO pins that
245 can be used for quite a number of things. The CS5535/6 is found on
246 AMD Geode and Lemote Yeeloong devices.
251 tristate "BT8XX GPIO abuser"
252 depends on PCI && VIDEO_BT848=n
254 The BT8xx frame grabber chip has 24 GPIO pins than can be abused
255 as a cheap PCI GPIO card.
257 This chip can be found on Miro, Hauppauge and STB TV-cards.
259 The card needs to be physically altered for using it as a
260 GPIO card. For more information on how to build a GPIO card
261 from a BT8xx TV card, see the documentation file at
262 Documentation/bt8xxgpio.txt
267 bool "Intel Moorestown Platform Langwell GPIO support"
270 Say Y here to support Intel Moorestown platform GPIO.
272 config GPIO_TIMBERDALE
273 bool "Support for timberdale GPIO IP"
274 depends on MFD_TIMBERDALE && GPIOLIB && HAS_IOMEM
276 Add support for the GPIO IP in the timberdale FPGA.
278 comment "SPI GPIO expanders:"
281 tristate "Maxim MAX7301 GPIO expander"
282 depends on SPI_MASTER
285 GPIO driver for Maxim MAX7301 SPI-based GPIO expander.
288 tristate "Microchip MCP23S08 I/O expander"
289 depends on SPI_MASTER
291 SPI driver for Microchip MCP23S08 I/O expander. This provides
292 a GPIO interface supporting inputs and outputs.
295 tristate "Freescale MC33880 high-side/low-side switch"
296 depends on SPI_MASTER
298 SPI driver for Freescale MC33880 high-side/low-side switch.
299 This provides GPIO interface supporting inputs and outputs.
301 comment "AC97 GPIO expanders:"
304 bool "Philips UCB1400 GPIO"
305 depends on UCB1400_CORE
307 This enables support for the Philips UCB1400 GPIO pins.
308 The UCB1400 is an AC97 audio codec.
310 To compile this driver as a module, choose M here: the
311 module will be called ucb1400_gpio.