ARM: sun8i: a33: Add devfreq-based GPU cooling

This adds GPU thermal throttling for the Allwinner A33.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>

arch/arm/boot/dts/sun8i-a23-a33.dtsi

@@ -492,6 +492,7 @@ mali: gpu@1c40000 {
 			clocks = <&ccu CLK_BUS_GPU>, <&ccu CLK_GPU>;
 			clock-names = "bus", "core";
 			resets = <&ccu RST_BUS_GPU>;
+			#cooling-cells = <2>;
 
 			assigned-clocks = <&ccu CLK_GPU>;
 			assigned-clock-rates = <408000000>;

arch/arm/boot/dts/sun8i-a33.dtsi

@@ -407,6 +407,16 @@ map1 {
 					trip = <&cpu_alert1>;
 					cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
 				};
+
+				map2 {
+					trip = <&gpu_alert0>;
+					cooling-device = <&mali 1 THERMAL_NO_LIMIT>;
+				};
+
+				map3 {
+					trip = <&gpu_alert1>;
+					cooling-device = <&mali 2 THERMAL_NO_LIMIT>;
+				};
 			};
 
 			trips {
@@ -417,6 +427,13 @@ cpu_alert0: cpu_alert0 {
 					type = "passive";
 				};
 
+				gpu_alert0: gpu_alert0 {
+					/* milliCelsius */
+					temperature = <85000>;
+					hysteresis = <2000>;
+					type = "passive";
+				};
+
 				cpu_alert1: cpu_alert1 {
 					/* milliCelsius */
 					temperature = <90000>;
@@ -424,6 +441,13 @@ cpu_alert1: cpu_alert1 {
 					type = "hot";
 				};
 
+				gpu_alert1: gpu_alert1 {
+					/* milliCelsius */
+					temperature = <95000>;
+					hysteresis = <2000>;
+					type = "hot";
+				};
+
 				cpu_crit: cpu_crit {
 					/* milliCelsius */
 					temperature = <110000>;