hwmon: (lm90) Document support for the MAX6648/6692 chips

Update documentation to prevent further confusion/duplication.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
diff --git a/Documentation/hwmon/lm90 b/Documentation/hwmon/lm90
index 0e84117..93d8e3d 100644
--- a/Documentation/hwmon/lm90
+++ b/Documentation/hwmon/lm90
@@ -42,6 +42,11 @@
     Addresses scanned: I2C 0x4e
     Datasheet: Publicly available at the Maxim website
                http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3497
+  * Maxim MAX6648
+    Prefix: 'max6646'
+    Addresses scanned: I2C 0x4c
+    Datasheet: Publicly available at the Maxim website
+               http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3500
   * Maxim MAX6649
     Prefix: 'max6646'
     Addresses scanned: I2C 0x4c
@@ -74,6 +79,11 @@
                            0x4c, 0x4d and 0x4e
     Datasheet: Publicly available at the Maxim website
                http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3370
+  * Maxim MAX6692
+    Prefix: 'max6646'
+    Addresses scanned: I2C 0x4c
+    Datasheet: Publicly available at the Maxim website
+               http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3500
 
 
 Author: Jean Delvare <khali@linux-fr.org>