1# 2# platform-neutral GPIO infrastructure and expanders 3# 4 5config ARCH_WANT_OPTIONAL_GPIOLIB 6 bool 7 help 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. 14 15config ARCH_REQUIRE_GPIOLIB 16 bool 17 select GPIOLIB 18 help 19 Platforms select gpiolib if they use this infrastructure 20 for all their GPIOs, usually starting with ones integrated 21 into SOC processors. 22 Selecting this from the architecture code will cause the gpiolib 23 code to always get built in. 24 25 26 27menuconfig GPIOLIB 28 bool "GPIO Support" 29 depends on ARCH_WANT_OPTIONAL_GPIOLIB || ARCH_REQUIRE_GPIOLIB 30 select GENERIC_GPIO 31 help 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. 35 36 If unsure, say N. 37 38if GPIOLIB 39 40config DEBUG_GPIO 41 bool "Debug GPIO calls" 42 depends on DEBUG_KERNEL 43 help 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. 50 51config GPIO_SYSFS 52 bool "/sys/class/gpio/... (sysfs interface)" 53 depends on SYSFS && EXPERIMENTAL 54 help 55 Say Y here to add a sysfs interface for GPIOs. 56 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. 62 63 Kernel drivers may also request that a particular GPIO be 64 exported to userspace; this can be useful when debugging. 65 66# put expanders in the right section, in alphabetical order 67 68config GPIO_MAX730X 69 tristate 70 71comment "Memory mapped GPIO expanders:" 72 73config GPIO_IT8761E 74 tristate "IT8761E GPIO support" 75 depends on GPIOLIB 76 help 77 Say yes here to support GPIO functionality of IT8761E super I/O chip. 78 79config GPIO_PL061 80 bool "PrimeCell PL061 GPIO support" 81 depends on ARM_AMBA 82 help 83 Say yes here to support the PrimeCell PL061 GPIO device 84 85config GPIO_XILINX 86 bool "Xilinx GPIO support" 87 depends on PPC_OF || MICROBLAZE 88 help 89 Say yes here to support the Xilinx FPGA GPIO device 90 91config GPIO_VR41XX 92 tristate "NEC VR4100 series General-purpose I/O Uint support" 93 depends on CPU_VR41XX 94 help 95 Say yes here to support the NEC VR4100 series General-purpose I/O Uint 96 97config GPIO_SCH 98 tristate "Intel SCH GPIO" 99 depends on GPIOLIB && PCI 100 select MFD_CORE 101 select LPC_SCH 102 help 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. 110 111 This driver can also be built as a module. If so, the module 112 will be called sch-gpio. 113 114comment "I2C GPIO expanders:" 115 116config GPIO_MAX7300 117 tristate "Maxim MAX7300 GPIO expander" 118 depends on I2C 119 select GPIO_MAX730X 120 help 121 GPIO driver for Maxim MAX7301 I2C-based GPIO expander. 122 123config GPIO_MAX732X 124 tristate "MAX7319, MAX7320-7327 I2C Port Expanders" 125 depends on I2C 126 help 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 131 below: 132 133 8 bits: max7319 (8I), max7320 (8O), max7321 (8P), 134 max7322 (4I4O), max7323 (4P4O) 135 136 16 bits: max7324 (8I8O), max7325 (8P8O), 137 max7326 (4I12O), max7327 (4P12O) 138 139 Board setup code must specify the model to use, and the start 140 number for these GPIOs. 141 142config GPIO_MAX732X_IRQ 143 bool "Interrupt controller support for MAX732x" 144 depends on GPIO_MAX732X=y && GENERIC_HARDIRQS 145 help 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. 148 149config GPIO_PCA953X 150 tristate "PCA953x, PCA955x, TCA64xx, and MAX7310 I/O ports" 151 depends on I2C 152 help 153 Say yes here to provide access to several register-oriented 154 SMBus I/O expanders, made mostly by NXP or TI. Compatible 155 models include: 156 157 4 bits: pca9536, pca9537 158 159 8 bits: max7310, pca9534, pca9538, pca9554, pca9557, 160 tca6408 161 162 16 bits: pca9535, pca9539, pca9555, tca6416 163 164 This driver can also be built as a module. If so, the module 165 will be called pca953x. 166 167config GPIO_PCA953X_IRQ 168 bool "Interrupt controller support for PCA953x" 169 depends on GPIO_PCA953X=y 170 help 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. 173 174config GPIO_PCF857X 175 tristate "PCF857x, PCA{85,96}7x, and MAX732[89] I2C GPIO expanders" 176 depends on I2C 177 help 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: 182 183 8 bits: pcf8574, pcf8574a, pca8574, pca8574a, 184 pca9670, pca9672, pca9674, pca9674a, 185 max7328, max7329 186 187 16 bits: pcf8575, pcf8575c, pca8575, 188 pca9671, pca9673, pca9675 189 190 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. 194 195 This driver provides an in-kernel interface to those GPIOs using 196 platform-neutral GPIO calls. 197 198config GPIO_TC35892 199 bool "TC35892 GPIOs" 200 depends on MFD_TC35892 201 help 202 This enables support for the GPIOs found on the TC35892 203 I/O Expander. 204 205config GPIO_TWL4030 206 tristate "TWL4030, TWL5030, and TPS659x0 GPIOs" 207 depends on TWL4030_CORE 208 help 209 Say yes here to access the GPIO signals of various multi-function 210 power management chips from Texas Instruments. 211 212config GPIO_WM831X 213 tristate "WM831x GPIOs" 214 depends on MFD_WM831X 215 help 216 Say yes here to access the GPIO signals of WM831x power management 217 chips from Wolfson Microelectronics. 218 219config GPIO_WM8350 220 tristate "WM8350 GPIOs" 221 depends on MFD_WM8350 222 help 223 Say yes here to access the GPIO signals of WM8350 power management 224 chips from Wolfson Microelectronics. 225 226config GPIO_WM8994 227 tristate "WM8994 GPIOs" 228 depends on MFD_WM8994 229 help 230 Say yes here to access the GPIO signals of WM8994 audio hub 231 CODECs from Wolfson Microelectronics. 232 233config GPIO_ADP5520 234 tristate "GPIO Support for ADP5520 PMIC" 235 depends on PMIC_ADP5520 236 help 237 This option enables support for on-chip GPIO found 238 on Analog Devices ADP5520 PMICs. 239 240 To compile this driver as a module, choose M here: the module will 241 be called adp5520-gpio. 242 243config GPIO_ADP5588 244 tristate "ADP5588 I2C GPIO expander" 245 depends on I2C 246 help 247 This option enables support for 18 GPIOs found 248 on Analog Devices ADP5588 GPIO Expanders. 249 To compile this driver as a module, choose M here: the module will be 250 called adp5588-gpio. 251 252comment "PCI GPIO expanders:" 253 254config GPIO_CS5535 255 tristate "AMD CS5535/CS5536 GPIO support" 256 depends on PCI && !CS5535_GPIO 257 help 258 The AMD CS5535 and CS5536 southbridges support 28 GPIO pins that 259 can be used for quite a number of things. The CS5535/6 is found on 260 AMD Geode and Lemote Yeeloong devices. 261 262 If unsure, say N. 263 264config GPIO_BT8XX 265 tristate "BT8XX GPIO abuser" 266 depends on PCI && VIDEO_BT848=n 267 help 268 The BT8xx frame grabber chip has 24 GPIO pins than can be abused 269 as a cheap PCI GPIO card. 270 271 This chip can be found on Miro, Hauppauge and STB TV-cards. 272 273 The card needs to be physically altered for using it as a 274 GPIO card. For more information on how to build a GPIO card 275 from a BT8xx TV card, see the documentation file at 276 Documentation/bt8xxgpio.txt 277 278 If unsure, say N. 279 280config GPIO_LANGWELL 281 bool "Intel Langwell/Penwell GPIO support" 282 depends on PCI 283 help 284 Say Y here to support Intel Langwell/Penwell GPIO. 285 286config GPIO_TIMBERDALE 287 bool "Support for timberdale GPIO IP" 288 depends on MFD_TIMBERDALE && GPIOLIB && HAS_IOMEM 289 ---help--- 290 Add support for the GPIO IP in the timberdale FPGA. 291 292config GPIO_RDC321X 293 tristate "RDC R-321x GPIO support" 294 depends on PCI && GPIOLIB 295 select MFD_CORE 296 select MFD_RDC321X 297 help 298 Support for the RDC R321x SoC GPIOs over southbridge 299 PCI configuration space. 300 301comment "SPI GPIO expanders:" 302 303config GPIO_MAX7301 304 tristate "Maxim MAX7301 GPIO expander" 305 depends on SPI_MASTER 306 select GPIO_MAX730X 307 help 308 GPIO driver for Maxim MAX7301 SPI-based GPIO expander. 309 310config GPIO_MCP23S08 311 tristate "Microchip MCP23S08 I/O expander" 312 depends on SPI_MASTER 313 help 314 SPI driver for Microchip MCP23S08 I/O expander. This provides 315 a GPIO interface supporting inputs and outputs. 316 317config GPIO_MC33880 318 tristate "Freescale MC33880 high-side/low-side switch" 319 depends on SPI_MASTER 320 help 321 SPI driver for Freescale MC33880 high-side/low-side switch. 322 This provides GPIO interface supporting inputs and outputs. 323 324comment "AC97 GPIO expanders:" 325 326config GPIO_UCB1400 327 bool "Philips UCB1400 GPIO" 328 depends on UCB1400_CORE 329 help 330 This enables support for the Philips UCB1400 GPIO pins. 331 The UCB1400 is an AC97 audio codec. 332 333 To compile this driver as a module, choose M here: the 334 module will be called ucb1400_gpio. 335 336comment "MODULbus GPIO expanders:" 337 338config GPIO_JANZ_TTL 339 tristate "Janz VMOD-TTL Digital IO Module" 340 depends on MFD_JANZ_CMODIO 341 help 342 This enables support for the Janz VMOD-TTL Digital IO module. 343 This driver provides support for driving the pins in output 344 mode only. Input mode is not supported. 345 346endif 347