Merge branches 'stable/ia64', 'stable/blkfront-cleanup' and 'stable/cleanup' of git...

[pandora-kernel.git] / Documentation / hwmon / jc42

diff --git a/Documentation/hwmon/jc42 b/Documentation/hwmon/jc42
index 0e76ef1..a22ecf4 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.
 
@@ -81,15 +86,19 @@ limits. The chip supports only a single register to configure the hysteresis,
 which applies to all limits. This register can be written by writing into
 temp1_crit_hyst. Other hysteresis attributes are read-only.
 
+If the BIOS has configured the sensor for automatic temperature management, it
+is likely that it has locked the registers, i.e., that the temperature limits
+cannot be changed.
+
 Sysfs entries
 -------------
 
 temp1_input            Temperature (RO)
-temp1_min              Minimum temperature (RW)
-temp1_max              Maximum temperature (RW)
-temp1_crit             Critical high temperature (RW)
+temp1_min              Minimum temperature (RO or RW)
+temp1_max              Maximum temperature (RO or RW)
+temp1_crit             Critical high temperature (RO or RW)
 
-temp1_crit_hyst                Critical hysteresis temperature (RW)
+temp1_crit_hyst                Critical hysteresis temperature (RO or RW)
 temp1_max_hyst         Maximum hysteresis temperature (RO)
 
 temp1_min_alarm                Temperature low alarm