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   - "socionext,uniphier-pxs3-thermal" : For UniPhier PXs3 SoC
  12 - interrupts : IRQ for the temperature alarm
  13 - #thermal-sensor-cells : Should be 0. See ./thermal.txt for details.
  14
  15 Optional properties:
  16 - socionext,tmod-calibration: A pair of calibrated values referred from PVT,
  17                               in case that the values aren't set on SoC,
  18                               like a reference board.
  19
  20 Example:
  21
  22         sysctrl@61840000 {
  23                 compatible = "socionext,uniphier-ld20-sysctrl",
  24                              "simple-mfd", "syscon";
  25                 reg = <0x61840000 0x10000>;
  26                 ...
  27                 pvtctl: pvtctl {
  28                         compatible = "socionext,uniphier-ld20-thermal";
  29                         interrupts = <0 3 1>;
  30                         #thermal-sensor-cells = <0>;
  31                 };
  32                 ...
  33         };
  34
  35         thermal-zones {
  36                 cpu_thermal {
  37                         polling-delay-passive = <250>;  /* 250ms */
  38                         polling-delay = <1000>;         /* 1000ms */
  39                         thermal-sensors = <&pvtctl>;
  40
  41                         trips {
  42                                 cpu_crit: cpu_crit {
  43                                         temperature = <110000>; /* 110C */
  44                                         hysteresis = <2000>;
  45                                         type = "critical";
  46                                 };
  47                                 cpu_alert: cpu_alert {
  48                                         temperature = <100000>; /* 100C */
  49                                         hysteresis = <2000>;
  50                                         type = "passive";
  51                                 };
  52                         };
  53
  54                         cooling-maps {
  55                                 map0 {
  56                                         trip = <&cpu_alert>;
  57                                         cooling-device = <&cpu0 (-1) (-1)>;
  58                                 };
  59                                 map1 {
  60                                         trip = <&cpu_alert>;
  61                                         cooling-device = <&cpu2 (-1) (-1)>;
  62                                 };
  63                         };
  64                 };
  65         };