1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 560687c4667e..36d5d6aefc0e 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -27,6 +27,29 @@ config DEBUG_GPIO
 
 comment "I2C GPIO expanders:"
 
+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:"
 
 endmenu