arm64: dts: rockchip: add passive GPU cooling on RK3588

As the GPU support on RK3588 has been merged upstream, along with OPP
values, add a corresponding cooling map for passive cooling using the GPU.
Signed-off-by: Alexey Charkov <alchark@gmail.com>
Link: https://lore.kernel.org/r/20240617-rk-dts-additions-v5-3-c1f5f3267f1e@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3588-base.dtsi

@@ -2493,17 +2493,31 @@ center_crit: center-crit {
 		};
 
 		gpu_thermal: gpu-thermal {
-			polling-delay-passive = <0>;
+			polling-delay-passive = <100>;
 			polling-delay = <0>;
 			thermal-sensors = <&tsadc 5>;
 
 			trips {
+				gpu_alert: gpu-alert {
+					temperature = <85000>;
+					hysteresis = <2000>;
+					type = "passive";
+				};
+
 				gpu_crit: gpu-crit {
 					temperature = <115000>;
 					hysteresis = <0>;
 					type = "critical";
 				};
 			};
+
+			cooling-maps {
+				map0 {
+					trip = <&gpu_alert>;
+					cooling-device =
+						<&gpu THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+				};
+			};
 		};
 
 		npu_thermal: npu-thermal {