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David Brownella9c5fff2008-02-04 22:28:17 -08001#
2# GPIO infrastructure and expanders
3#
4
Michael Buesch7444a722008-07-25 01:46:11 -07005config ARCH_WANT_OPTIONAL_GPIOLIB
David Brownella9c5fff2008-02-04 22:28:17 -08006 bool
7 help
Michael Buesch7444a722008-07-25 01:46:11 -07008 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
David Brownella9c5fff2008-02-04 22:28:17 -080019 Platforms select gpiolib if they use this infrastructure
20 for all their GPIOs, usually starting with ones integrated
21 into SOC processors.
Michael Buesch7444a722008-07-25 01:46:11 -070022 Selecting this from the architecture code will cause the gpiolib
23 code to always get built in.
David Brownella9c5fff2008-02-04 22:28:17 -080024
Michael Buesch7444a722008-07-25 01:46:11 -070025
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
David Brownella9c5fff2008-02-04 22:28:17 -080039
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.
Matt LaPlante692105b2009-01-26 11:12:25 +010045 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
David Brownella9c5fff2008-02-04 22:28:17 -080048 slower. The diagnostics help catch the type of setup errors
49 that are most common when setting up new platforms or boards.
50
David Brownelld8f388d2008-07-25 01:46:07 -070051config 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
David Brownella9c5fff2008-02-04 22:28:17 -080066# put expanders in the right section, in alphabetical order
67
John Linn0bcb6062008-11-12 13:25:38 -080068comment "Memory mapped GPIO expanders:"
69
Baruch Siach1e9c2852009-06-18 16:48:58 -070070config GPIO_PL061
71 bool "PrimeCell PL061 GPIO support"
72 depends on ARM_AMBA
73 help
74 Say yes here to support the PrimeCell PL061 GPIO device
75
John Linn0bcb6062008-11-12 13:25:38 -080076config GPIO_XILINX
77 bool "Xilinx GPIO support"
Michal Simek6fa612b2009-05-11 15:49:12 +020078 depends on PPC_OF || MICROBLAZE
John Linn0bcb6062008-11-12 13:25:38 -080079 help
80 Say yes here to support the Xilinx FPGA GPIO device
81
Yoichi Yuasa27fdd322009-06-29 11:11:05 +090082config GPIO_VR41XX
83 tristate "NEC VR4100 series General-purpose I/O Uint support"
84 depends on CPU_VR41XX
85 help
86 Say yes here to support the NEC VR4100 series General-purpose I/O Uint
87
David Brownella9c5fff2008-02-04 22:28:17 -080088comment "I2C GPIO expanders:"
89
Eric Miaobbcd6d52008-07-25 01:46:14 -070090config GPIO_MAX732X
91 tristate "MAX7319, MAX7320-7327 I2C Port Expanders"
92 depends on I2C
93 help
94 Say yes here to support the MAX7319, MAX7320-7327 series of I2C
95 Port Expanders. Each IO port on these chips has a fixed role of
96 Input (designated by 'I'), Push-Pull Output ('O'), or Open-Drain
97 Input and Output (designed by 'P'). The combinations are listed
98 below:
99
100 8 bits: max7319 (8I), max7320 (8O), max7321 (8P),
101 max7322 (4I4O), max7323 (4P4O)
102
103 16 bits: max7324 (8I8O), max7325 (8P8O),
104 max7326 (4I12O), max7327 (4P12O)
105
106 Board setup code must specify the model to use, and the start
107 number for these GPIOs.
108
Guennadi Liakhovetskif3dc3632008-02-06 01:39:03 -0800109config GPIO_PCA953X
David Brownellab5dc372009-01-06 14:42:27 -0800110 tristate "PCA953x, PCA955x, TCA64xx, and MAX7310 I/O ports"
eric miao9e60fdc2008-02-04 22:28:26 -0800111 depends on I2C
112 help
David Brownell7059d4b2008-07-04 09:59:37 -0700113 Say yes here to provide access to several register-oriented
114 SMBus I/O expanders, made mostly by NXP or TI. Compatible
115 models include:
116
117 4 bits: pca9536, pca9537
118
David Brownellab5dc372009-01-06 14:42:27 -0800119 8 bits: max7310, pca9534, pca9538, pca9554, pca9557,
120 tca6408
David Brownell7059d4b2008-07-04 09:59:37 -0700121
David Brownellab5dc372009-01-06 14:42:27 -0800122 16 bits: pca9535, pca9539, pca9555, tca6416
eric miao9e60fdc2008-02-04 22:28:26 -0800123
124 This driver can also be built as a module. If so, the module
Guennadi Liakhovetskif3dc3632008-02-06 01:39:03 -0800125 will be called pca953x.
eric miao9e60fdc2008-02-04 22:28:26 -0800126
David Brownell15fae372008-02-04 22:28:24 -0800127config GPIO_PCF857X
David Brownell1673ad52008-07-21 14:21:34 -0700128 tristate "PCF857x, PCA{85,96}7x, and MAX732[89] I2C GPIO expanders"
David Brownell15fae372008-02-04 22:28:24 -0800129 depends on I2C
130 help
131 Say yes here to provide access to most "quasi-bidirectional" I2C
132 GPIO expanders used for additional digital outputs or inputs.
133 Most of these parts are from NXP, though TI is a second source for
134 some of them. Compatible models include:
135
136 8 bits: pcf8574, pcf8574a, pca8574, pca8574a,
David Brownell1673ad52008-07-21 14:21:34 -0700137 pca9670, pca9672, pca9674, pca9674a,
138 max7328, max7329
David Brownell15fae372008-02-04 22:28:24 -0800139
140 16 bits: pcf8575, pcf8575c, pca8575,
141 pca9671, pca9673, pca9675
142
143 Your board setup code will need to declare the expanders in
144 use, and assign numbers to the GPIOs they expose. Those GPIOs
145 can then be used from drivers and other kernel code, just like
146 other GPIOs, but only accessible from task contexts.
147
148 This driver provides an in-kernel interface to those GPIOs using
149 platform-neutral GPIO calls.
150
David Brownelle9d359472008-10-20 23:51:46 +0200151config GPIO_TWL4030
152 tristate "TWL4030, TWL5030, and TPS659x0 GPIOs"
153 depends on TWL4030_CORE
154 help
155 Say yes here to access the GPIO signals of various multi-function
156 power management chips from Texas Instruments.
157
Mark Browne4b736f2009-07-27 14:46:00 +0100158config GPIO_WM831X
159 tristate "WM831x GPIOs"
160 depends on MFD_WM831X
161 help
162 Say yes here to access the GPIO signals of WM831x power management
163 chips from Wolfson Microelectronics.
164
Michael Hennerichef72af42009-09-22 16:46:39 -0700165config GPIO_ADP5520
166 tristate "GPIO Support for ADP5520 PMIC"
167 depends on PMIC_ADP5520
168 help
169 This option enables support for on-chip GPIO found
170 on Analog Devices ADP5520 PMICs.
171
172 To compile this driver as a module, choose M here: the module will
173 be called adp5520-gpio.
174
Michael Bueschff1d5c22008-07-25 01:46:10 -0700175comment "PCI GPIO expanders:"
176
177config GPIO_BT8XX
178 tristate "BT8XX GPIO abuser"
179 depends on PCI && VIDEO_BT848=n
180 help
181 The BT8xx frame grabber chip has 24 GPIO pins than can be abused
182 as a cheap PCI GPIO card.
183
184 This chip can be found on Miro, Hauppauge and STB TV-cards.
185
186 The card needs to be physically altered for using it as a
187 GPIO card. For more information on how to build a GPIO card
188 from a BT8xx TV card, see the documentation file at
189 Documentation/bt8xxgpio.txt
190
191 If unsure, say N.
192
Alek Du8bf02612009-09-22 16:46:36 -0700193config GPIO_LANGWELL
194 bool "Intel Moorestown Platform Langwell GPIO support"
195 depends on PCI
196 help
197 Say Y here to support Intel Moorestown platform GPIO.
198
David Brownella9c5fff2008-02-04 22:28:17 -0800199comment "SPI GPIO expanders:"
200
Juergen Beisert0c36ec32008-07-21 14:21:34 -0700201config GPIO_MAX7301
202 tristate "Maxim MAX7301 GPIO expander"
203 depends on SPI_MASTER
204 help
205 gpio driver for Maxim MAX7301 SPI GPIO expander.
206
David Brownelle58b9e22008-02-04 22:28:25 -0800207config GPIO_MCP23S08
208 tristate "Microchip MCP23S08 I/O expander"
209 depends on SPI_MASTER
210 help
211 SPI driver for Microchip MCP23S08 I/O expander. This provides
212 a GPIO interface supporting inputs and outputs.
213
Richard Röjfors1e5db002009-09-22 16:46:34 -0700214config GPIO_MC33880
215 tristate "Freescale MC33880 high-side/low-side switch"
216 depends on SPI_MASTER
217 help
218 SPI driver for Freescale MC33880 high-side/low-side switch.
219 This provides GPIO interface supporting inputs and outputs.
220
Marek Vasut4cf8e532009-09-22 16:46:35 -0700221comment "AC97 GPIO expanders:"
222
223config GPIO_UCB1400
224 bool "Philips UCB1400 GPIO"
225 depends on UCB1400_CORE
226 help
227 This enables support for the Philips UCB1400 GPIO pins.
228 The UCB1400 is an AC97 audio codec.
229
230 To compile this driver as a module, choose M here: the
231 module will be called ucb1400_gpio.
232
Michael Buesch7444a722008-07-25 01:46:11 -0700233endif