[PATCH v2 3/3] ARM: dts: sti: add thermal-zones support on stih418

[Raphael Gallais-Pou]

Add a 'thermal-zones' node for stih418.

A thermal-zone needs three components:
  - thermal sensors, described in an earlier commit[1]
  - cooling devices, specified for each CPU
  - a thermal zone, describing the overall behavior.

The thermal zone needs references to both CPUs and thermal sensors,
which phandle are also added. The thermal management will then be
achieved on CPUs using the cpufreq framework.

[1] https://lore.kernel.org/lkml/20240320-thermal-v3-2-700296694c4a@gmail.com/

Reviewed-by: Patrice Chotard <patrice.chotard at foss.st.com>
Signed-off-by: Raphael Gallais-Pou <rgallaispou at gmail.com>
---
 arch/arm/boot/dts/st/stih407-family.dtsi |  6 +++--
 arch/arm/boot/dts/st/stih418.dtsi        | 41 +++++++++++++++++++++++++++++---
 2 files changed, 42 insertions(+), 5 deletions(-)

diff --git a/arch/arm/boot/dts/st/stih407-family.dtsi b/arch/arm/boot/dts/st/stih407-family.dtsi
index 29302e74aa1d..35a55aef7f4b 100644
--- a/arch/arm/boot/dts/st/stih407-family.dtsi
+++ b/arch/arm/boot/dts/st/stih407-family.dtsi
@@ -33,7 +33,7 @@ delta_reserved: rproc at 44000000 {
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
-		cpu at 0 {
+		cpu0: cpu at 0 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a9";
 			reg = <0>;
@@ -52,8 +52,9 @@ cpu at 0 {
 			clock-latency = <100000>;
 			cpu0-supply = <&pwm_regulator>;
 			st,syscfg = <&syscfg_core 0x8e0>;
+			#cooling-cells = <2>;
 		};
-		cpu at 1 {
+		cpu1: cpu at 1 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a9";
 			reg = <1>;
@@ -66,6 +67,7 @@ cpu at 1 {
 					    1200000 0
 					    800000  0
 					    500000  0>;
+			#cooling-cells = <2>;
 		};
 	};
 
diff --git a/arch/arm/boot/dts/st/stih418.dtsi b/arch/arm/boot/dts/st/stih418.dtsi
index b35b9b7a7ccc..6622ffa8ecfa 100644
--- a/arch/arm/boot/dts/st/stih418.dtsi
+++ b/arch/arm/boot/dts/st/stih418.dtsi
@@ -6,23 +6,26 @@
 #include "stih418-clock.dtsi"
 #include "stih407-family.dtsi"
 #include "stih410-pinctrl.dtsi"
+#include <dt-bindings/thermal/thermal.h>
 / {
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
-		cpu at 2 {
+		cpu2: cpu at 2 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a9";
 			reg = <2>;
 			/* u-boot puts hpen in SBC dmem at 0xa4 offset */
 			cpu-release-addr = <0x94100A4>;
+			#cooling-cells = <2>;
 		};
-		cpu at 3 {
+		cpu3: cpu at 3 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a9";
 			reg = <3>;
 			/* u-boot puts hpen in SBC dmem at 0xa4 offset */
 			cpu-release-addr = <0x94100A4>;
+			#cooling-cells = <2>;
 		};
 	};
 
@@ -44,6 +47,38 @@ usb2_picophy2: phy3 {
 		reset-names = "global", "port";
 	};
 
+	thermal-zones {
+		cpu_thermal: cpu-thermal {
+			polling-delay-passive = <250>;  /* 250ms */
+			polling-delay = <1000>;         /* 1000ms */
+
+			thermal-sensors = <&thermal>;
+
+			trips {
+				cpu_crit: cpu-crit {
+					temperature = <95000>;  /* 95C */
+					hysteresis = <2000>;
+					type = "critical";
+				};
+				cpu_alert: cpu-alert {
+					temperature = <85000>;  /* 85C */
+					hysteresis = <2000>;
+					type = "passive";
+				};
+			};
+
+			cooling-maps {
+				map {
+					trip = <&cpu_alert>;
+					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>;
+				};
+			};
+		};
+	};
+
 	soc {
 		rng11: rng at 8a8a000 {
 			status = "disabled";
@@ -107,7 +142,7 @@ mmc0: sdhci at 9060000 {
 			assigned-clock-rates = <200000000>;
 		};
 
-		thermal at 91a0000 {
+		thermal: thermal at 91a0000 {
 			compatible = "st,stih407-thermal";
 			reg = <0x91a0000 0x28>;
 			clock-names = "thermal";

-- 
2.45.2