hwmon: (jc42) more helpful documentation

The documentation lists standard numbers and chip names in excruciating
detail, but that's all it does.  To help mere mortals in deciding
whether to enable this driver, mention what this sensor is for and in
which systems it might be found.

Also add a link to the actual JC 42.4 specification.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Cc: stable@kernel.org
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>

diff --git a/Documentation/hwmon/jc42 b/Documentation/hwmon/jc42
index 0e76ef12e4c60d996fde89cef341f5dc05163160..2a0924003f9255a4b0edf53f561eb30a9bc1c11e 100644 (file)
--- a/Documentation/hwmon/jc42
+++ b/Documentation/hwmon/jc42
@@ -51,7 +51,8 @@ Supported chips:
   * JEDEC JC 42.4 compliant temperature sensor chips
     Prefix: 'jc42'
     Addresses scanned: I2C 0x18 - 0x1f
-    Datasheet: -
+    Datasheet:
+       http://www.jedec.org/sites/default/files/docs/4_01_04R19.pdf
 
 Author:
        Guenter Roeck <guenter.roeck@ericsson.com>
@@ -60,7 +61,11 @@ Author:
 Description
 -----------
 
-This driver implements support for JEDEC JC 42.4 compliant temperature sensors.
+This driver implements support for JEDEC JC 42.4 compliant temperature sensors,
+which are used on many DDR3 memory modules for mobile devices and servers. Some
+systems use the sensor to prevent memory overheating by automatically throttling
+the memory controller.
+
 The driver auto-detects the chips listed above, but can be manually instantiated
 to support other JC 42.4 compliant chips.
 

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 773e484f16466482ed6a499005b27485c6854400..412339451a32899d835241a73d235d401fb162cd 100644 (file)
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -455,13 +455,14 @@ config SENSORS_JZ4740
          called jz4740-hwmon.
 
 config SENSORS_JC42
-       tristate "JEDEC JC42.4 compliant temperature sensors"
+       tristate "JEDEC JC42.4 compliant memory module temperature sensors"
        depends on I2C
        help
-         If you say yes here you get support for Jedec JC42.4 compliant
-         temperature sensors. Support will include, but not be limited to,
-         ADT7408, CAT34TS02,, CAT6095, MAX6604, MCP9805, MCP98242, MCP98243,
-         MCP9843, SE97, SE98, STTS424, TSE2002B3, and TS3000B3.
+         If you say yes here, you get support for JEDEC JC42.4 compliant
+         temperature sensors, which are used on many DDR3 memory modules for
+         mobile devices and servers.  Support will include, but not be limited
+         to, ADT7408, CAT34TS02, CAT6095, MAX6604, MCP9805, MCP98242, MCP98243,
+         MCP9843, SE97, SE98, STTS424(E), TSE2002B3, and TS3000B3.
 
          This driver can also be built as a module.  If so, the module
          will be called jc42.