[PATCH 2/2] hwmon: Add documentation for tmp421 driver

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This patch adds documentation for driver tmp421.

Signed-off-by: Andre Prendel <andre.prendel at gmx.de>
---
 tmp421 |   36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

Index: linux-2.6/Documentation/hwmon/tmp421
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6/Documentation/hwmon/tmp421	2009-06-11 21:50:46.000000000 +0200
@@ -0,0 +1,36 @@
+Kernel driver tmp421
+====================
+
+Supported chips:
+  * Texas Instruments TMP421
+    Prefix: 'tmp421'
+    Addresses scanned: I2C 0x2a, 0x4c, 0x4d, 0x4e and 0x4f
+    Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp421.html
+  * Texas Instruments TMP422
+    Prefix: 'tmp422'
+    Addresses scanned: I2C 0x2a, 0x4c, 0x4d, 0x4e and 0x4f
+    Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp421.html
+  * Texas Instruments TMP423
+    Prefix: 'tmp423'
+    Addresses scanned: I2C 0x2a, 0x4c, 0x4d, 0x4e and 0x4f
+    Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp421.html
+
+Authors:
+	Andre Prendel <andre.prendel at gmx.de>
+
+Description
+-----------
+
+This driver implements support for Texas Instruments TMP421, TMP422
+and TMP423 temperature sensor chips. These chips implements one local
+and up to one (TMP421), up to two (TMP422) or up to three (TMP423)
+remote sensors. Temperature is measured in degrees Celsius. The chips
+are wired over I2C/SMBus and specified over a temperature range of
+-40?C to +125?C. Resolution for both the local and remote channels is
+0.0625?C.
+
+The chips supports only temperature measurement and exports these
+values via following sysfs-interface:
+
+temp[1-4]_input
+temp[2-4]_fault



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