mvebu: enable thermal zone polling for IEI Puzzle devices

Marvell's thermal sensors do not support interrupts, so we need to
poll them. Reading temperature every second should be enough to
control the fan.
While at it, also make sure fan speed is reduced again if temperature
goes down.

Signed-off-by: Daniel Golle <[email protected]>

target/linux/mvebu/files/arch/arm64/boot/dts/marvell/puzzle-thermal.dtsi

@@ -1,4 +1,7 @@
 #define PUZZLE_FAN_THERMAL(_cname, _fan)					\
+	polling-delay-passive = <500>;						\
+	polling-delay = <1000>;							\
+										\
 	trips {									\
 		_cname##_active_high: cpu-active-high {				\
 			temperature = <80000>;					\
@@ -28,14 +31,14 @@
 		};								\
 		cpu-active-med {						\
 			trip = <&_cname##_active_med>;				\
-			cooling-device = <_fan 2 THERMAL_NO_LIMIT>;		\
+			cooling-device = <_fan 2 3>;				\
 		};								\
 		cpu-active-low {						\
 			trip = <&_cname##_active_low>;				\
-			cooling-device = <_fan 1 THERMAL_NO_LIMIT>;		\
+			cooling-device = <_fan 1 2>;				\
 		};								\
 		cpu-active-idle {						\
 			trip = <&_cname##_active_idle>;				\
-			cooling-device = <_fan 0 THERMAL_NO_LIMIT>;		\
+			cooling-device = <_fan 0 0>;				\
 		};								\
 	}