[PATCH v3 05/10] ARM: tegra: tf701t: Add thermal zones for nct1008 sensor

ASUS TF701T has an additional thermal sensor for more accurate readings.
Add thermal zones for this sensor.

Signed-off-by: Svyatoslav Ryhel <[email protected]>
Reviewed-by: Mikko Perttunen <[email protected]>
---
 .../boot/dts/nvidia/tegra114-asus-tf701t.dts  | 83 +++++++++++++++++++
 1 file changed, 83 insertions(+)

diff --git a/arch/arm/boot/dts/nvidia/tegra114-asus-tf701t.dts b/arch/arm/boot/dts/nvidia/tegra114-asus-tf701t.dts
index a27d3c4f2c63c..83f8dd84d28a2 100644
--- a/arch/arm/boot/dts/nvidia/tegra114-asus-tf701t.dts
+++ b/arch/arm/boot/dts/nvidia/tegra114-asus-tf701t.dts
@@ -4,6 +4,7 @@
 
 #include <dt-bindings/input/gpio-keys.h>
 #include <dt-bindings/input/input.h>
+#include <dt-bindings/thermal/thermal.h>
 
 #include "tegra114.dtsi"
 
@@ -2682,4 +2683,86 @@ vdd_1v8_touch: regulator-touch-vio {
 		enable-active-high;
 		vin-supply = <&vdd_3v3_sys>;
 	};
+
+	thermal-zones {
+		/*
+		 * NCT72 has two sensors:
+		 *
+		 *	0: internal that monitors ambient/skin temperature
+		 *	1: external that is connected to the CPU's diode
+		 *
+		 * Ideally we should use userspace thermal governor,
+		 * but it's a much more complex solution. The "skin"
+		 * zone exists as a simpler solution which prevents
+		 * Transformer from getting too hot from a user's
+		 * tactile perspective. The CPU zone is intended to
+		 * protect silicon from damage.
+		 */
+
+		nct72-skin-thermal {
+			polling-delay-passive = <1000>; /* milliseconds */
+			polling-delay = <5000>; /* milliseconds */
+
+			thermal-sensors = <&temp_sensor 0>;
+
+			trips {
+				skin_alert_trip: skin-alert {
+					/* throttle at 57C until temperature drops to 56.5C */
+					temperature = <57000>;
+					hysteresis = <500>;
+					type = "passive";
+				};
+
+				skin-crit {
+					/* shut down at 65C */
+					temperature = <65000>;
+					hysteresis = <2000>;
+					type = "critical";
+				};
+			};
+
+			cooling-maps {
+				map-skin {
+					trip = <&skin_alert_trip>;
+					cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+							 <&cpu1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+							 <&cpu2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+							 <&cpu3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+				};
+			};
+		};
+
+		nct72-cpu-thermal {
+			polling-delay-passive = <1000>; /* milliseconds */
+			polling-delay = <5000>; /* milliseconds */
+
+			thermal-sensors = <&temp_sensor 1>;
+
+			trips {
+				cpu_alert_trip: cpu-alert {
+					/* throttle at 75C until temperature drops to 74.5C */
+					temperature = <75000>;
+					hysteresis = <500>;
+					type = "passive";
+				};
+
+				cpu-crit {
+					/* shut down at 105C */
+					temperature = <105000>;
+					hysteresis = <2000>;
+					type = "critical";
+				};
+			};
+
+			cooling-maps {
+				map-cpu {
+					trip = <&cpu_alert_trip>;
+					cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+							 <&cpu1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+							 <&cpu2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+							 <&cpu3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+				};
+			};
+		};
+	};
 };
-- 
2.53.0