linux-kernel - [PATCH 15/15] ARM: dts: microchip: sama7d65: add thermal zones node

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Message-ID: <20250804100219.63325-16-varshini.rajendran@microchip.com>
Date: Mon, 4 Aug 2025 15:32:19 +0530
From: Varshini Rajendran <varshini.rajendran@...rochip.com>
To: <eugen.hristev@...aro.org>, <jic23@...nel.org>, <dlechner@...libre.com>,
	<nuno.sa@...log.com>, <andy@...nel.org>, <robh@...nel.org>,
	<krzk+dt@...nel.org>, <conor+dt@...nel.org>, <nicolas.ferre@...rochip.com>,
	<alexandre.belloni@...tlin.com>, <claudiu.beznea@...on.dev>,
	<srini@...nel.org>, <linux-iio@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
CC: <varshini.rajendran@...rochip.com>
Subject: [PATCH 15/15] ARM: dts: microchip: sama7d65: add thermal zones node

Add thermal zones node with its associated trips and cooling-maps.
It uses CPUFreq as cooling device for temperatures in the interval
[90, 100) degrees Celsius and describe the temperature of 100 degrees
Celsius as critical temperature. System will be is shutting down when
reaching critical temperature.

Signed-off-by: Varshini Rajendran <varshini.rajendran@...rochip.com>
---
 arch/arm/boot/dts/microchip/sama7d65.dtsi | 42 +++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/arch/arm/boot/dts/microchip/sama7d65.dtsi b/arch/arm/boot/dts/microchip/sama7d65.dtsi
index aefdd72cb59c..a4e5ef6a9cf2 100644
--- a/arch/arm/boot/dts/microchip/sama7d65.dtsi
+++ b/arch/arm/boot/dts/microchip/sama7d65.dtsi
@@ -16,6 +16,7 @@
 #include <dt-bindings/interrupt-controller/irq.h>
 #include <dt-bindings/mfd/at91-usart.h>
 #include <dt-bindings/nvmem/microchip,sama7g5-otpc.h>
+#include <dt-bindings/thermal/thermal.h>
 
 / {
 	model = "Microchip SAMA7D65 family SoC";
@@ -35,6 +36,7 @@ cpu0: cpu@0 {
 			clocks = <&pmc PMC_TYPE_CORE PMC_CPUPLL>;
 			clock-names = "cpu";
 			operating-points-v2 = <&cpu_opp_table>;
+			#cooling-cells = <2>; /* min followed by max */
 		};
 	};
 
@@ -110,6 +112,46 @@ thermal_sensor: thermal-sensor {
 		io-channel-names = "sensor-channel";
 	};
 
+	thermal-zones {
+		cpu_thermal: cpu-thermal {
+			polling-delay-passive = <1000>;
+			polling-delay = <5000>;
+			thermal-sensors = <&thermal_sensor>;
+
+			trips {
+				cpu_normal: cpu-alert0 {
+					temperature = <90000>;
+					hysteresis = <0>;
+					type = "passive";
+				};
+
+				cpu_hot: cpu-alert1 {
+					temperature = <95000>;
+					hysteresis = <0>;
+					type = "passive";
+				};
+
+				cpu_critical: cpu-critical {
+					temperature = <100000>;
+					hysteresis = <0>;
+					type = "critical";
+				};
+			};
+
+			cooling-maps {
+				map0 {
+					trip = <&cpu_normal>;
+					cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+				};
+
+				map1 {
+					trip = <&cpu_hot>;
+					cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+				};
+			};
+		};
+	};
+
 	soc {
 		compatible = "simple-bus";
 		ranges;
-- 
2.34.1