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Date:	Thu, 10 Jul 2014 15:18:48 +0100
From:	"Javi Merino" <>
	Zhang Rui <>,
	Eduardo Valentin <>
Subject: [RFC PATCH v5 10/10] of: thermal: Introduce sustainable power for a thermal zone

From: Punit Agrawal <>

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

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

Cc: Zhang Rui <>
Cc: Eduardo Valentin <>
Signed-off-by: Punit Agrawal <>
 Documentation/devicetree/bindings/thermal/thermal.txt | 4 ++++
 drivers/thermal/of-thermal.c                          | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/thermal/thermal.txt b/Documentation/devicetree/bindings/thermal/thermal.txt
index f5db6b72a36f..c6eb9a8d2aed 100644
--- a/Documentation/devicetree/bindings/thermal/thermal.txt
+++ b/Documentation/devicetree/bindings/thermal/thermal.txt
@@ -167,6 +167,10 @@ 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.
+  Size: one cell
 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
diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
index 04b1be7fa018..eaf81ea654b9 100644
--- a/drivers/thermal/of-thermal.c
+++ b/drivers/thermal/of-thermal.c
@@ -769,6 +769,7 @@ 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;
 		tz = thermal_of_build_thermal_zone(child);
 		if (IS_ERR(tz)) {
@@ -791,6 +792,9 @@ 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,

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