xref: /linux/drivers/gpio/Kconfig (revision 80884094e34456887ecdbd107d40e72c4a40f9c9)
1#
2# 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
68comment "Memory mapped GPIO expanders:"
69
70config 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
76config GPIO_XILINX
77	bool "Xilinx GPIO support"
78	depends on PPC_OF || MICROBLAZE
79	help
80	  Say yes here to support the Xilinx FPGA GPIO device
81
82config 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
88comment "I2C GPIO expanders:"
89
90config 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
109config GPIO_PCA953X
110	tristate "PCA953x, PCA955x, TCA64xx, and MAX7310 I/O ports"
111	depends on I2C
112	help
113	  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
119	  8 bits:	max7310, pca9534, pca9538, pca9554, pca9557,
120	  		tca6408
121
122	  16 bits:	pca9535, pca9539, pca9555, tca6416
123
124	  This driver can also be built as a module.  If so, the module
125	  will be called pca953x.
126
127config GPIO_PCF857X
128	tristate "PCF857x, PCA{85,96}7x, and MAX732[89] I2C GPIO expanders"
129	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,
137	            pca9670, pca9672, pca9674, pca9674a,
138	  	    max7328, max7329
139
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
151config 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
158config 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
165config 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
175config GPIO_ADP5588
176	tristate "ADP5588 I2C GPIO expander"
177	depends on I2C
178	help
179	  This option enables support for 18 GPIOs found
180	  on Analog Devices ADP5588 GPIO Expanders.
181	  To compile this driver as a module, choose M here: the module will be
182	  called adp5588-gpio.
183
184comment "PCI GPIO expanders:"
185
186config GPIO_CS5535
187	tristate "AMD CS5535/CS5536 GPIO support"
188	depends on PCI && !CS5535_GPIO
189	help
190	  The AMD CS5535 and CS5536 southbridges support 28 GPIO pins that
191	  can be used for quite a number of things.  The CS5535/6 is found on
192	  AMD Geode and Lemote Yeeloong devices.
193
194	  If unsure, say N.
195
196config GPIO_BT8XX
197	tristate "BT8XX GPIO abuser"
198	depends on PCI && VIDEO_BT848=n
199	help
200	  The BT8xx frame grabber chip has 24 GPIO pins than can be abused
201	  as a cheap PCI GPIO card.
202
203	  This chip can be found on Miro, Hauppauge and STB TV-cards.
204
205	  The card needs to be physically altered for using it as a
206	  GPIO card. For more information on how to build a GPIO card
207	  from a BT8xx TV card, see the documentation file at
208	  Documentation/bt8xxgpio.txt
209
210	  If unsure, say N.
211
212config GPIO_LANGWELL
213	bool "Intel Moorestown Platform Langwell GPIO support"
214	depends on PCI
215	help
216	  Say Y here to support Intel Moorestown platform GPIO.
217
218config GPIO_TIMBERDALE
219	bool "Support for timberdale GPIO IP"
220	depends on MFD_TIMBERDALE && GPIOLIB && HAS_IOMEM
221	---help---
222	Add support for the GPIO IP in the timberdale FPGA.
223
224comment "SPI GPIO expanders:"
225
226config GPIO_MAX7301
227	tristate "Maxim MAX7301 GPIO expander"
228	depends on SPI_MASTER
229	help
230	  gpio driver for Maxim MAX7301 SPI GPIO expander.
231
232config GPIO_MCP23S08
233	tristate "Microchip MCP23S08 I/O expander"
234	depends on SPI_MASTER
235	help
236	  SPI driver for Microchip MCP23S08 I/O expander.  This provides
237	  a GPIO interface supporting inputs and outputs.
238
239config GPIO_MC33880
240	tristate "Freescale MC33880 high-side/low-side switch"
241	depends on SPI_MASTER
242	help
243	  SPI driver for Freescale MC33880 high-side/low-side switch.
244	  This provides GPIO interface supporting inputs and outputs.
245
246comment "AC97 GPIO expanders:"
247
248config GPIO_UCB1400
249	bool "Philips UCB1400 GPIO"
250	depends on UCB1400_CORE
251	help
252	  This enables support for the Philips UCB1400 GPIO pins.
253	  The UCB1400 is an AC97 audio codec.
254
255	  To compile this driver as a module, choose M here: the
256	  module will be called ucb1400_gpio.
257
258endif
259