i2c: Add support for the PCF8575 chip

Signed-off-by: Bart Van Assche <bart.vanassche@gmail.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 15 insertions, 1 deletions

diff --git a/drivers/i2c/chips/Kconfig b/drivers/i2c/chips/Kconfig
index 2e1c24f671c..17702b32eab 100644
--- a/drivers/i2c/chips/Kconfig
+++ b/drivers/i2c/chips/Kconfig
@@ -57,7 +57,7 @@ config SENSORS_PCF8574
         default n
         help
           If you say yes here you get support for Philips PCF8574 and 
-          PCF8574A chips.
+          PCF8574A chips. These chips are 8-bit I/O expanders for the I2C bus.
 
           This driver can also be built as a module.  If so, the module
           will be called pcf8574.
@@ -65,6 +65,20 @@ config SENSORS_PCF8574
           These devices are hard to detect and rarely found on mainstream
           hardware.  If unsure, say N.
 
+config PCF8575
+        tristate "Philips PCF8575"
+        default n
+        help
+          If you say yes here you get support for Philips PCF8575 chip.
+          This chip is a 16-bit I/O expander for the I2C bus.  Several other
+          chip manufacturers sell equivalent chips, e.g. Texas Instruments.
+
+          This driver can also be built as a module.  If so, the module
+          will be called pcf8575.
+
+          This device is hard to detect and is rarely found on mainstream
+          hardware.  If unsure, say N.
+
 config SENSORS_PCA9539
         tristate "Philips PCA9539 16-bit I/O port"
         depends on EXPERIMENTAL