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ARM: dts: exynos: Add CPU cooling on Arndale Octa
Arndale Octa board comes without fan so proper CPU cooling is necessary to avoid critical shutdowns when CPUs are busy. Although thermal zones were present but CPU cooling was missing in DTS. Adjust the trip points and add respective cooling nodes for each CPU thermal zone. The CPU throttling will start at 60 degrees of C, intensify at 80 degrees of C and slow down CPUs as much as possible at 110 degrees of C. With this configuration, when running four CPU intensive tasks, the temperatures did not exceed 90 degrees of Celsius mostly oscillating around 88 degrees in hottest thermal zone. Test was however done with only four CPUs online (big cluster, Cortex A15) because of errors when booting secondary CPUs. Signed-off-by: Krzysztof Kozlowski <[email protected]>
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‎arch/arm/boot/dts/exynos5420-arndale-octa.dts

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@@ -59,6 +59,270 @@
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cpu-supply = <&buck6_reg>;
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};
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&cpu0_thermal {
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trips {
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cpu0_alert0: cpu-alert-0 {
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temperature = <60000>; /* millicelsius */
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hysteresis = <5000>; /* millicelsius */
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type = "passive";
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};
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cpu0_alert1: cpu-alert-1 {
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temperature = <80000>; /* millicelsius */
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hysteresis = <10000>; /* millicelsius */
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type = "passive";
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};
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cpu0_alert2: cpu-alert-2 {
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temperature = <110000>; /* millicelsius */
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hysteresis = <10000>; /* millicelsius */
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type = "passive";
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};
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cpu0_crit0: cpu-crit-0 {
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temperature = <120000>; /* millicelsius */
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hysteresis = <0>; /* millicelsius */
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type = "critical";
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};
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};
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cooling-maps {
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/*
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* Reduce the CPU speed by 2 steps, down to: 1600 MHz
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* and 1100 MHz.
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*/
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map0 {
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trip = <&cpu0_alert0>;
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cooling-device = <&cpu0 0 2>,
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<&cpu1 0 2>,
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<&cpu2 0 2>,
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<&cpu3 0 2>,
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<&cpu4 0 2>,
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<&cpu5 0 2>,
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<&cpu6 0 2>,
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<&cpu7 0 2>;
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};
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/*
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* Reduce the CPU speed down to 1200 MHz big (6 steps)
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* and 800 MHz LITTLE (5 steps).
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*/
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map1 {
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trip = <&cpu0_alert1>;
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cooling-device = <&cpu0 3 6>,
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<&cpu1 3 6>,
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<&cpu2 3 6>,
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<&cpu3 3 6>,
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<&cpu4 3 5>,
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<&cpu5 3 5>,
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<&cpu6 3 5>,
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<&cpu7 3 5>;
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};
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/*
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* Reduce the CPU speed as much as possible, down to 700 MHz
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* big (11 steps) and 600 MHz LITTLE (7 steps).
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*/
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map2 {
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trip = <&cpu0_alert2>;
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cooling-device = <&cpu0 6 11>,
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<&cpu1 6 11>,
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<&cpu2 6 11>,
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<&cpu3 6 11>,
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<&cpu4 5 7>,
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<&cpu5 5 7>,
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<&cpu6 5 7>,
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<&cpu7 5 7>;
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};
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};
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};
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&cpu1_thermal {
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trips {
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cpu1_alert0: cpu-alert-0 {
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temperature = <60000>; /* millicelsius */
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hysteresis = <5000>; /* millicelsius */
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type = "passive";
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};
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cpu1_alert1: cpu-alert-1 {
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temperature = <80000>; /* millicelsius */
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hysteresis = <10000>; /* millicelsius */
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type = "passive";
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};
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cpu1_alert2: cpu-alert-2 {
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temperature = <110000>; /* millicelsius */
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hysteresis = <10000>; /* millicelsius */
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type = "passive";
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};
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cpu1_crit0: cpu-crit-0 {
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temperature = <120000>; /* millicelsius */
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hysteresis = <0>; /* millicelsius */
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type = "critical";
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};
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};
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cooling-maps {
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map0 {
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trip = <&cpu1_alert0>;
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cooling-device = <&cpu0 0 2>,
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<&cpu1 0 2>,
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<&cpu2 0 2>,
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<&cpu3 0 2>,
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<&cpu4 0 2>,
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<&cpu5 0 2>,
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<&cpu6 0 2>,
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<&cpu7 0 2>;
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};
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map1 {
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trip = <&cpu1_alert1>;
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cooling-device = <&cpu0 3 6>,
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<&cpu1 3 6>,
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<&cpu2 3 6>,
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<&cpu3 3 6>,
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<&cpu4 3 5>,
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<&cpu5 3 5>,
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<&cpu6 3 5>,
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<&cpu7 3 5>;
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};
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map2 {
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trip = <&cpu1_alert2>;
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cooling-device = <&cpu0 6 11>,
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<&cpu1 6 11>,
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<&cpu2 6 11>,
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<&cpu3 6 11>,
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<&cpu4 5 7>,
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<&cpu5 5 7>,
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<&cpu6 5 7>,
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<&cpu7 5 7>;
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};
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};
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};
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&cpu2_thermal {
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trips {
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cpu2_alert0: cpu-alert-0 {
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temperature = <60000>; /* millicelsius */
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hysteresis = <5000>; /* millicelsius */
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type = "passive";
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};
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cpu2_alert1: cpu-alert-1 {
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temperature = <80000>; /* millicelsius */
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hysteresis = <10000>; /* millicelsius */
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type = "passive";
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};
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cpu2_alert2: cpu-alert-2 {
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temperature = <110000>; /* millicelsius */
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hysteresis = <10000>; /* millicelsius */
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type = "passive";
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};
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cpu2_crit0: cpu-crit-0 {
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temperature = <120000>; /* millicelsius */
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hysteresis = <0>; /* millicelsius */
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type = "critical";
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};
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};
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cooling-maps {
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map0 {
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trip = <&cpu2_alert0>;
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cooling-device = <&cpu0 0 2>,
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<&cpu1 0 2>,
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<&cpu2 0 2>,
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<&cpu3 0 2>,
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<&cpu4 0 2>,
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<&cpu5 0 2>,
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<&cpu6 0 2>,
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<&cpu7 0 2>;
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};
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map1 {
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trip = <&cpu2_alert1>;
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cooling-device = <&cpu0 3 6>,
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<&cpu1 3 6>,
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<&cpu2 3 6>,
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<&cpu3 3 6>,
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<&cpu4 3 5>,
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<&cpu5 3 5>,
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<&cpu6 3 5>,
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<&cpu7 3 5>;
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};
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map2 {
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trip = <&cpu2_alert2>;
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cooling-device = <&cpu0 6 11>,
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<&cpu1 6 11>,
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<&cpu2 6 11>,
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<&cpu3 6 11>,
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<&cpu4 6 7>,
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<&cpu5 6 7>,
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<&cpu6 6 7>,
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<&cpu7 6 7>;
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};
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};
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};
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&cpu3_thermal {
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trips {
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cpu3_alert0: cpu-alert-0 {
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temperature = <60000>; /* millicelsius */
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hysteresis = <5000>; /* millicelsius */
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type = "passive";
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};
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cpu3_alert1: cpu-alert-1 {
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temperature = <80000>; /* millicelsius */
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hysteresis = <10000>; /* millicelsius */
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type = "passive";
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};
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cpu3_alert2: cpu-alert-2 {
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temperature = <110000>; /* millicelsius */
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hysteresis = <10000>; /* millicelsius */
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type = "passive";
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};
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cpu3_crit0: cpu-crit-0 {
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temperature = <120000>; /* millicelsius */
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hysteresis = <0>; /* millicelsius */
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type = "critical";
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};
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};
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cooling-maps {
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map0 {
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trip = <&cpu3_alert0>;
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cooling-device = <&cpu0 0 2>,
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<&cpu1 0 2>,
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<&cpu2 0 2>,
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<&cpu3 0 2>,
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<&cpu4 0 2>,
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<&cpu5 0 2>,
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<&cpu6 0 2>,
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<&cpu7 0 2>;
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};
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map1 {
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trip = <&cpu3_alert1>;
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cooling-device = <&cpu0 3 6>,
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<&cpu1 3 6>,
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<&cpu2 3 6>,
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<&cpu3 3 6>,
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<&cpu4 3 5>,
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<&cpu5 3 5>,
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<&cpu6 3 5>,
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<&cpu7 3 5>;
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};
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map2 {
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trip = <&cpu3_alert2>;
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cooling-device = <&cpu0 6 11>,
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<&cpu1 6 11>,
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<&cpu2 6 11>,
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<&cpu3 6 11>,
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<&cpu4 5 7>,
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<&cpu5 5 7>,
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<&cpu6 5 7>,
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<&cpu7 5 7>;
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};
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};
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};
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&usbdrd_dwc3_1 {
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dr_mode = "host";
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};

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