[PATCH v2 6/7] of: thermal: Introduce sustainable power for a thermal zone

Javi Merino
2015-02-26T19:00:32Z

From: Punit Agrawal <punit.agrawal@arm.com>

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>
---
Documentation/devicetree/bindings/thermal/thermal.txt | 9 +++++++++
drivers/thermal/of-thermal.c | 4 ++++
2 files changed, 13 insertions(+)

diff --git a/Documentation/devicetree/bindings/thermal/thermal.txt b/Documentation/devicetree/bindings/thermal/thermal.txt
index 29fe0bfae38e..8a49362dea6e 100644
--- a/Documentation/devicetree/bindings/thermal/thermal.txt
+++ b/Documentation/devicetree/bindings/thermal/thermal.txt
@@ -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 {
diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
index c606b85ea9f4..705b21d01f1c 100644
--- a/drivers/thermal/of-thermal.c
+++ b/drivers/thermal/of-thermal.c
@@ -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,
--
1.9.1