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of: thermal: Introduce sustainable power for a thermal zone

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Introduce an optional property called, sustainable-power, which
represents the power (in mW) which the thermal zone can safely
dissipate.

If provided the property is parsed and associated with the thermal
zone via the thermal zone parameters.

Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
This commit is contained in:
Punit Agrawal 2015-02-26 19:00:32 +00:00 committed by Eduardo Valentin
parent 6828a4711f
commit 647f99255d
2 changed files with 13 additions and 0 deletions
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9
Documentation/devicetree/bindings/thermal/thermal.txt
View File

@ -167,6 +167,13 @@ Optional property:
by means of sensor ID. Additional coefficients are
interpreted as constant offset.
- sustainable-power: An estimate of the sustainable power (in mW) that the
Type: unsigned thermal zone can dissipate at the desired
Size: one cell control temperature. For reference, the
sustainable power of a 4'' phone is typically
2000mW, while on a 10'' tablet is around
4500mW.
Note: The delay properties are bound to the maximum dT/dt (temperature
derivative over time) in two situations for a thermal zone:
(i) - when passive cooling is activated (polling-delay-passive); and
@ -546,6 +553,8 @@ thermal-zones {
*/
coefficients = <1200 -345 890>;
sustainable-power = <2500>;
trips {
/* Trips are based on resulting linear equation */
cpu_trip: cpu-trip {

4
drivers/thermal/of-thermal.c
View File

@ -866,6 +866,7 @@ int __init of_parse_thermal_zones(void)
for_each_child_of_node(np, child) {
struct thermal_zone_device *zone;
struct thermal_zone_params *tzp;
u32 prop;
/* Check whether child is enabled or not */
if (!of_device_is_available(child))
@ -892,6 +893,9 @@ int __init of_parse_thermal_zones(void)
/* No hwmon because there might be hwmon drivers registering */
tzp->no_hwmon = true;
if (!of_property_read_u32(child, "sustainable-power", &prop))
tzp->sustainable_power = prop;
zone = thermal_zone_device_register(child->name, tz->ntrips,
0, tz,
ops, tzp,