hwmon: Add ST-Ericsson ABX500 hwmon driver

Each of ST-Ericsson X500 chip set series consists of both ABX500 and DBX500
chips. This is ABX500 hwmon driver, where the abx500.c is a common layer for
all ABX500s, and the ab8500.c is specific for AB8500 chip. Under this designed
structure, other chip specific files can be added simply using the same common
layer abx500.c.

Signed-off-by: Hongbo Zhang <hongbo.zhang@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Anton Vorontsov <anton@enomsg.org>
diff --git a/Documentation/hwmon/ab8500 b/Documentation/hwmon/ab8500
new file mode 100644
index 0000000..cf169c8
--- /dev/null
+++ b/Documentation/hwmon/ab8500
@@ -0,0 +1,22 @@
+Kernel driver ab8500
+====================
+
+Supported chips:
+  * ST-Ericsson AB8500
+    Prefix: 'ab8500'
+    Addresses scanned: -
+    Datasheet: http://www.stericsson.com/developers/documentation.jsp
+
+Authors:
+        Martin Persson <martin.persson@stericsson.com>
+        Hongbo Zhang <hongbo.zhang@linaro.org>
+
+Description
+-----------
+
+See also Documentation/hwmon/abx500. This is the ST-Ericsson AB8500 specific
+driver.
+
+Currently only the AB8500 internal sensor and one external sensor for battery
+temperature are monitored. Other GPADC channels can also be monitored if needed
+in future.