diff options
| author | Keerthy <j-keerthy@ti.com> | 2011-09-26 12:24:48 +0100 |
|---|---|---|
| committer | Andy Green <andy.green@linaro.org> | 2011-09-26 12:24:48 +0100 |
| commit | a868bc087563eed43cdd81975c9b068ab24557b7 (patch) | |
| tree | 798d6a703abe446b5d51ac5a2545aa96dab0f7ee /Documentation | |
| parent | beabd54efefa48ccda5fab1790e9140ea4bbcaf2 (diff) | |
hwmon: OMAP4: On die temperature sensor driver
On chip temperature sensor driver. The driver monitors the temperature of
the MPU subsystem of the OMAP4. It sends notifications to the user space if
the temperature crosses user defined thresholds via kobject_uevent interface.
The user is allowed to configure the temperature thresholds vis sysfs nodes
exposed using hwmon interface.
Signed-off-by: Keerthy <j-keerthy@ti.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/hwmon/omap_temp_sensor | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/Documentation/hwmon/omap_temp_sensor b/Documentation/hwmon/omap_temp_sensor new file mode 100644 index 00000000000..357f09a9387 --- /dev/null +++ b/Documentation/hwmon/omap_temp_sensor @@ -0,0 +1,26 @@ +Kernel driver omap_temp_sensor +============================== + +Supported chips: + * Texas Instruments OMAP4460 + Prefix: 'omap_temp_sensor' + +Author: + J Keerthy <j-keerthy@ti.com> + +Description +----------- + +The Texas Instruments OMAP4 family of chips have a bandgap temperature sensor. +The temperature sensor feature is used to convert the temperature of the device +into a decimal value coded on 10 bits. An internal ADC is used for conversion. +The recommended operating temperatures must be in the range -40 degree Celsius +to 123 degree celsius for standard conversion. +The thresholds are programmable and upon crossing the thresholds an interrupt +is generated. The OMAP temperature sensor has a programmable update rate in +milli seconds. +(Currently the driver programs a default of 2000 milliseconds). + +The driver provides the common sysfs-interface for temperatures (see +Documentation/hwmon/sysfs-interface under Temperatures). + |