Documentation/devicetree/bindings/thermal/uniphier-thermal.txt

   1 * UniPhier Thermal bindings
   2
   3 This describes the devicetree bindings for thermal monitor supported by
   4 PVT(Process, Voltage and Temperature) monitoring unit implemented on Socionext
   5 UniPhier SoCs.
   6
   7 Required properties:
   8 - compatible :
   9   - "socionext,uniphier-pxs2-thermal" : For UniPhier PXs2 SoC
  10   - "socionext,uniphier-ld20-thermal" : For UniPhier LD20 SoC
  11 - interrupts : IRQ for the temperature alarm
  12 - #thermal-sensor-cells : Should be 0. See ./thermal.txt for details.
  13
  14 Optional properties:
  15 - socionext,tmod-calibration: A pair of calibrated values referred from PVT,
  16                               in case that the values aren't set on SoC,
  17                               like a reference board.
  18
  19 Example:
  20
  21         sysctrl@61840000 {
  22                 compatible = "socionext,uniphier-ld20-sysctrl",
  23                              "simple-mfd", "syscon";
  24                 reg = <0x61840000 0x10000>;
  25                 ...
  26                 pvtctl: pvtctl {
  27                         compatible = "socionext,uniphier-ld20-thermal";
  28                         interrupts = <0 3 1>;
  29                         #thermal-sensor-cells = <0>;
  30                 };
  31                 ...
  32         };
  33
  34         thermal-zones {
  35                 cpu_thermal {
  36                         polling-delay-passive = <250>;  /* 250ms */
  37                         polling-delay = <1000>;         /* 1000ms */
  38                         thermal-sensors = <&pvtctl>;
  39
  40                         trips {
  41                                 cpu_crit: cpu_crit {
  42                                         temperature = <110000>; /* 110C */
  43                                         hysteresis = <2000>;
  44                                         type = "critical";
  45                                 };
  46                                 cpu_alert: cpu_alert {
  47                                         temperature = <100000>; /* 100C */
  48                                         hysteresis = <2000>;
  49                                         type = "passive";
  50                                 };
  51                         };
  52
  53                         cooling-maps {
  54                                 map0 {
  55                                         trip = <&cpu_alert>;
  56                                         cooling-device = <&cpu0 (-1) (-1)>;
  57                                 };
  58                                 map1 {
  59                                         trip = <&cpu_alert>;
  60                                         cooling-device = <&cpu2 (-1) (-1)>;
  61                                 };
  62                         };
  63                 };
  64         };