[PATCH 1/3] arm64: dts: ti: k3-am62a: Enable CPU freq throttling on thermal alert

[Daniel Schultz <d.schultz@phytec.de>]

Enable throttling down the CPU frequency when an alert temperature
threshold (lower than the critical threshold) is reached.

Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
---
 arch/arm64/boot/dts/ti/k3-am62a-thermal.dtsi | 57 ++++++++++++++++++--
 arch/arm64/boot/dts/ti/k3-am62a7.dtsi        |  4 ++
 2 files changed, 58 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/ti/k3-am62a-thermal.dtsi b/arch/arm64/boot/dts/ti/k3-am62a-thermal.dtsi
index c7486fb2a5b4..39ff9118b6c4 100644
--- a/arch/arm64/boot/dts/ti/k3-am62a-thermal.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62a-thermal.dtsi
@@ -12,12 +12,29 @@ main0_thermal: main0-thermal {
 		thermal-sensors = <&wkup_vtm0 0>;
 
 		trips {
+			main0_alert: main0-alert {
+				temperature = <95000>;
+				hysteresis = <2000>;
+				type = "passive";
+			};
+
 			main0_crit: main0-crit {
 				temperature = <125000>;	/* milliCelsius */
 				hysteresis = <2000>;	/* milliCelsius */
 				type = "critical";
 			};
 		};
+
+		cooling-maps {
+			map0 {
+				trip = <&main0_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>;
+			};
+		};
 	};
 
 	main1_thermal: main1-thermal {
@@ -26,25 +43,59 @@ main1_thermal: main1-thermal {
 		thermal-sensors = <&wkup_vtm0 1>;
 
 		trips {
+			main1_alert: main1-alert {
+				temperature = <95000>;
+				hysteresis = <2000>;
+				type = "passive";
+			};
+
 			main1_crit: main1-crit {
 				temperature = <125000>;	/* milliCelsius */
 				hysteresis = <2000>;	/* milliCelsius */
 				type = "critical";
 			};
 		};
+
+		cooling-maps {
+			map0 {
+				trip = <&main1_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>;
+			};
+		};
 	};
 
 	main2_thermal: main2-thermal {
-	       polling-delay-passive = <250>;	/* milliSeconds */
-	       polling-delay = <500>;		/* milliSeconds */
-	       thermal-sensors = <&wkup_vtm0 2>;
+		polling-delay-passive = <250>;	/* milliSeconds */
+		polling-delay = <500>;		/* milliSeconds */
+		thermal-sensors = <&wkup_vtm0 2>;
 
 		trips {
+			main2_alert: main2-alert {
+				temperature = <95000>;
+				hysteresis = <2000>;
+				type = "passive";
+			};
+
 			main2_crit: main2-crit {
 				temperature = <125000>;	/* milliCelsius */
 				hysteresis = <2000>;	/* milliCelsius */
 				type = "critical";
 			};
 		};
+
+		cooling-maps {
+			map0 {
+				trip = <&main2_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>;
+			};
+		};
 	};
 };
diff --git a/arch/arm64/boot/dts/ti/k3-am62a7.dtsi b/arch/arm64/boot/dts/ti/k3-am62a7.dtsi
index 6c99221beb6b..b6e5eee99370 100644
--- a/arch/arm64/boot/dts/ti/k3-am62a7.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62a7.dtsi
@@ -50,6 +50,7 @@ cpu0: cpu@0 {
 			next-level-cache = <&L2_0>;
 			operating-points-v2 = <&a53_opp_table>;
 			clocks = <&k3_clks 135 0>;
+			#cooling-cells = <2>;
 		};
 
 		cpu1: cpu@1 {
@@ -66,6 +67,7 @@ cpu1: cpu@1 {
 			next-level-cache = <&L2_0>;
 			operating-points-v2 = <&a53_opp_table>;
 			clocks = <&k3_clks 136 0>;
+			#cooling-cells = <2>;
 		};
 
 		cpu2: cpu@2 {
@@ -82,6 +84,7 @@ cpu2: cpu@2 {
 			next-level-cache = <&L2_0>;
 			operating-points-v2 = <&a53_opp_table>;
 			clocks = <&k3_clks 137 0>;
+			#cooling-cells = <2>;
 		};
 
 		cpu3: cpu@3 {
@@ -98,6 +101,7 @@ cpu3: cpu@3 {
 			next-level-cache = <&L2_0>;
 			operating-points-v2 = <&a53_opp_table>;
 			clocks = <&k3_clks 138 0>;
+			#cooling-cells = <2>;
 		};
 	};
 
-- 
2.25.1