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+#
+# GPIO infrastructure and expanders
+#
+
+config HAVE_GPIO_LIB
+        bool
+        help
+          Platforms select gpiolib if they use this infrastructure
+          for all their GPIOs, usually starting with ones integrated
+          into SOC processors.
+
+menu "GPIO Support"
+        depends on HAVE_GPIO_LIB
+
+config DEBUG_GPIO
+        bool "Debug GPIO calls"
+        depends on DEBUG_KERNEL
+        help
+          Say Y here to add some extra checks and diagnostics to GPIO calls.
+          The checks help ensure that GPIOs have been properly initialized
+          before they are used and that sleeping calls aren not made from
+          nonsleeping contexts.  They can make bitbanged serial protocols
+          slower.  The diagnostics help catch the type of setup errors
+          that are most common when setting up new platforms or boards.
+
+# put expanders in the right section, in alphabetical order
+
+comment "I2C GPIO expanders:"
+
+config GPIO_PCA9539
+        tristate "PCA9539 16-bit I/O port"
+        depends on I2C
+        help
+          Say yes here to support the PCA9539 16-bit I/O port. These
+          parts are made by NXP and TI.
+
+          This driver can also be built as a module.  If so, the module
+          will be called pca9539.
+
+config GPIO_PCF857X
+        tristate "PCF857x, PCA857x, and PCA967x I2C GPIO expanders"
+        depends on I2C
+        help
+          Say yes here to provide access to most "quasi-bidirectional" I2C
+          GPIO expanders used for additional digital outputs or inputs.
+          Most of these parts are from NXP, though TI is a second source for
+          some of them.  Compatible models include:
+
+          8 bits:   pcf8574, pcf8574a, pca8574, pca8574a,
+                    pca9670, pca9672, pca9674, pca9674a
+
+          16 bits:  pcf8575, pcf8575c, pca8575,
+                    pca9671, pca9673, pca9675
+
+          Your board setup code will need to declare the expanders in
+          use, and assign numbers to the GPIOs they expose.  Those GPIOs
+          can then be used from drivers and other kernel code, just like
+          other GPIOs, but only accessible from task contexts.
+
+          This driver provides an in-kernel interface to those GPIOs using
+          platform-neutral GPIO calls.
+
+comment "SPI GPIO expanders:"
+
+config GPIO_MCP23S08
+        tristate "Microchip MCP23S08 I/O expander"
+        depends on SPI_MASTER
+        help
+          SPI driver for Microchip MCP23S08 I/O expander.  This provides
+          a GPIO interface supporting inputs and outputs.
+
+endmenu