arch/arm/boot/dts/exynos5422-cpu-thermal.dtsi

   1 /*
   2  * Device tree sources for Exynos5422 thermal zone
   3  *
   4  * Copyright (c) 2015 Lukasz Majewski <l.majewski@samsung.com>
   5  *                      Anand Moon <linux.amoon@gmail.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  */
  12
  13 #include <dt-bindings/thermal/thermal.h>
  14
  15 / {
  16         thermal-zones {
  17                 cpu0_thermal: cpu0-thermal {
  18                         thermal-sensors = <&tmu_cpu0 0>;
  19                         polling-delay-passive = <250>;
  20                         polling-delay = <0>;
  21                         trips {
  22                                 cpu_alert0: cpu-alert-0 {
  23                                         temperature = <50000>; /* millicelsius */
  24                                         hysteresis = <5000>; /* millicelsius */
  25                                         type = "active";
  26                                 };
  27                                 cpu_alert1: cpu-alert-1 {
  28                                         temperature = <60000>; /* millicelsius */
  29                                         hysteresis = <5000>; /* millicelsius */
  30                                         type = "active";
  31                                 };
  32                                 cpu_alert2: cpu-alert-2 {
  33                                         temperature = <70000>; /* millicelsius */
  34                                         hysteresis = <5000>; /* millicelsius */
  35                                         type = "active";
  36                                 };
  37                                 cpu_crit0: cpu-crit-0 {
  38                                         temperature = <120000>; /* millicelsius */
  39                                         hysteresis = <0>; /* millicelsius */
  40                                         type = "critical";
  41                                 };
  42                                 /*
  43                                  * Exyunos542x support only 4 trip-points
  44                                  * so for these polling mode is required.
  45                                  * Start polling at temperature level of last
  46                                  * interrupt-driven trip: cpu_alert2
  47                                  */
  48                                 cpu_alert3: cpu-alert-3 {
  49                                         temperature = <70000>; /* millicelsius */
  50                                         hysteresis = <10000>; /* millicelsius */
  51                                         type = "passive";
  52                                 };
  53                                 cpu_alert4: cpu-alert-4 {
  54                                         temperature = <85000>; /* millicelsius */
  55                                         hysteresis = <10000>; /* millicelsius */
  56                                         type = "passive";
  57                                 };
  58
  59                         };
  60                         cooling-maps {
  61                                 map0 {
  62                                      trip = <&cpu_alert0>;
  63                                      cooling-device = <&fan0 0 1>;
  64                                 };
  65                                 map1 {
  66                                      trip = <&cpu_alert1>;
  67                                      cooling-device = <&fan0 1 2>;
  68                                 };
  69                                 map2 {
  70                                      trip = <&cpu_alert2>;
  71                                      cooling-device = <&fan0 2 3>;
  72                                 };
  73                                 /*
  74                                  * When reaching cpu_alert3, reduce CPU
  75                                  * by 2 steps. On Exynos5422/5800 that would
  76                                  * be: 1500 MHz and 1100 MHz.
  77                                  */
  78                                 map3 {
  79                                      trip = <&cpu_alert3>;
  80                                      cooling-device = <&cpu0 0 2>;
  81                                 };
  82                                 map4 {
  83                                      trip = <&cpu_alert3>;
  84                                      cooling-device = <&cpu4 0 2>;
  85                                 };
  86
  87                                 /*
  88                                  * When reaching cpu_alert4, reduce CPU
  89                                  * further, down to 600 MHz (11 steps for big,
  90                                  * 7 steps for LITTLE).
  91                                  */
  92                                 map5 {
  93                                      trip = <&cpu_alert4>;
  94                                      cooling-device = <&cpu0 3 7>;
  95                                 };
  96                                 map6 {
  97                                      trip = <&cpu_alert4>;
  98                                      cooling-device = <&cpu4 3 11>;
  99                                 };
 100                         };
 101                 };
 102         };
 103 };