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David Brownella9c5fff2008-02-04 22:28:17 -08001#
2# GPIO infrastructure and expanders
3#
4
5config HAVE_GPIO_LIB
6 bool
7 help
8 Platforms select gpiolib if they use this infrastructure
9 for all their GPIOs, usually starting with ones integrated
10 into SOC processors.
11
12menu "GPIO Support"
13 depends on HAVE_GPIO_LIB
14
15config DEBUG_GPIO
16 bool "Debug GPIO calls"
17 depends on DEBUG_KERNEL
18 help
19 Say Y here to add some extra checks and diagnostics to GPIO calls.
20 The checks help ensure that GPIOs have been properly initialized
21 before they are used and that sleeping calls aren not made from
22 nonsleeping contexts. They can make bitbanged serial protocols
23 slower. The diagnostics help catch the type of setup errors
24 that are most common when setting up new platforms or boards.
25
26# put expanders in the right section, in alphabetical order
27
28comment "I2C GPIO expanders:"
29
Guennadi Liakhovetskif3dc3632008-02-06 01:39:03 -080030config GPIO_PCA953X
David Brownell7059d4b2008-07-04 09:59:37 -070031 tristate "PCA953x, PCA955x, and MAX7310 I/O ports"
eric miao9e60fdc2008-02-04 22:28:26 -080032 depends on I2C
33 help
David Brownell7059d4b2008-07-04 09:59:37 -070034 Say yes here to provide access to several register-oriented
35 SMBus I/O expanders, made mostly by NXP or TI. Compatible
36 models include:
37
38 4 bits: pca9536, pca9537
39
40 8 bits: max7310, pca9534, pca9538, pca9554, pca9557
41
42 16 bits: pca9535, pca9539, pca9555
eric miao9e60fdc2008-02-04 22:28:26 -080043
44 This driver can also be built as a module. If so, the module
Guennadi Liakhovetskif3dc3632008-02-06 01:39:03 -080045 will be called pca953x.
eric miao9e60fdc2008-02-04 22:28:26 -080046
David Brownell15fae372008-02-04 22:28:24 -080047config GPIO_PCF857X
David Brownell1673ad52008-07-21 14:21:34 -070048 tristate "PCF857x, PCA{85,96}7x, and MAX732[89] I2C GPIO expanders"
David Brownell15fae372008-02-04 22:28:24 -080049 depends on I2C
50 help
51 Say yes here to provide access to most "quasi-bidirectional" I2C
52 GPIO expanders used for additional digital outputs or inputs.
53 Most of these parts are from NXP, though TI is a second source for
54 some of them. Compatible models include:
55
56 8 bits: pcf8574, pcf8574a, pca8574, pca8574a,
David Brownell1673ad52008-07-21 14:21:34 -070057 pca9670, pca9672, pca9674, pca9674a,
58 max7328, max7329
David Brownell15fae372008-02-04 22:28:24 -080059
60 16 bits: pcf8575, pcf8575c, pca8575,
61 pca9671, pca9673, pca9675
62
63 Your board setup code will need to declare the expanders in
64 use, and assign numbers to the GPIOs they expose. Those GPIOs
65 can then be used from drivers and other kernel code, just like
66 other GPIOs, but only accessible from task contexts.
67
68 This driver provides an in-kernel interface to those GPIOs using
69 platform-neutral GPIO calls.
70
David Brownella9c5fff2008-02-04 22:28:17 -080071comment "SPI GPIO expanders:"
72
Juergen Beisert0c36ec32008-07-21 14:21:34 -070073config GPIO_MAX7301
74 tristate "Maxim MAX7301 GPIO expander"
75 depends on SPI_MASTER
76 help
77 gpio driver for Maxim MAX7301 SPI GPIO expander.
78
David Brownelle58b9e22008-02-04 22:28:25 -080079config GPIO_MCP23S08
80 tristate "Microchip MCP23S08 I/O expander"
81 depends on SPI_MASTER
82 help
83 SPI driver for Microchip MCP23S08 I/O expander. This provides
84 a GPIO interface supporting inputs and outputs.
85
David Brownella9c5fff2008-02-04 22:28:17 -080086endmenu