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

   1 * Temperature Sensor ADC (TSADC) on rockchip SoCs
   2
   3 Required properties:
   4 - compatible : should be "rockchip,<name>-tsadc"
   5    "rockchip,rk3228-tsadc": found on RK3228 SoCs
   6    "rockchip,rk3288-tsadc": found on RK3288 SoCs
   7    "rockchip,rk3368-tsadc": found on RK3368 SoCs
   8    "rockchip,rk3399-tsadc": found on RK3399 SoCs
   9 - reg : physical base address of the controller and length of memory mapped
  10         region.
  11 - interrupts : The interrupt number to the cpu. The interrupt specifier format
  12                depends on the interrupt controller.
  13 - clocks : Must contain an entry for each entry in clock-names.
  14 - clock-names : Shall be "tsadc" for the converter-clock, and "apb_pclk" for
  15                 the peripheral clock.
  16 - resets : Must contain an entry for each entry in reset-names.
  17            See ../reset/reset.txt for details.
  18 - reset-names : Must include the name "tsadc-apb".
  19 - pinctrl-names : The pin control state names;
  20 - pinctrl-0 : The "init" pinctrl state, it will be set before device probe.
  21 - pinctrl-1 : The "default" pinctrl state, it will be set after reset the
  22               TSADC controller.
  23 - pinctrl-2 : The "sleep" pinctrl state, it will be in for suspend.
  24 - #thermal-sensor-cells : Should be 1. See ./thermal.txt for a description.
  25 - rockchip,hw-tshut-temp : The hardware-controlled shutdown temperature value.
  26 - rockchip,hw-tshut-mode : The hardware-controlled shutdown mode 0:CRU 1:GPIO.
  27 - rockchip,hw-tshut-polarity : The hardware-controlled active polarity 0:LOW
  28                                1:HIGH.
  29
  30 Exiample:
  31 tsadc: tsadc@ff280000 {
  32         compatible = "rockchip,rk3288-tsadc";
  33         reg = <0xff280000 0x100>;
  34         interrupts = <GIC_SPI 37 IRQ_TYPE_LEVEL_HIGH>;
  35         clocks = <&cru SCLK_TSADC>, <&cru PCLK_TSADC>;
  36         clock-names = "tsadc", "apb_pclk";
  37         resets = <&cru SRST_TSADC>;
  38         reset-names = "tsadc-apb";
  39         pinctrl-names = "init", "default", "sleep";
  40         pinctrl-0 = <&otp_gpio>;
  41         pinctrl-1 = <&otp_out>;
  42         pinctrl-2 = <&otp_gpio>;
  43         #thermal-sensor-cells = <1>;
  44         rockchip,hw-tshut-temp = <95000>;
  45         rockchip,hw-tshut-mode = <0>;
  46         rockchip,hw-tshut-polarity = <0>;
  47 };
  48
  49 Example: referring to thermal sensors:
  50 thermal-zones {
  51         cpu_thermal: cpu_thermal {
  52                 polling-delay-passive = <1000>; /* milliseconds */
  53                 polling-delay = <5000>; /* milliseconds */
  54
  55                 /* sensor       ID */
  56                 thermal-sensors = <&tsadc       1>;
  57
  58                 trips {
  59                         cpu_alert0: cpu_alert {
  60                                 temperature = <70000>; /* millicelsius */
  61                                 hysteresis = <2000>; /* millicelsius */
  62                                 type = "passive";
  63                         };
  64                         cpu_crit: cpu_crit {
  65                                 temperature = <90000>; /* millicelsius */
  66                                 hysteresis = <2000>; /* millicelsius */
  67                                 type = "critical";
  68                         };
  69                 };
  70
  71                 cooling-maps {
  72                         map0 {
  73                                 trip = <&cpu_alert0>;
  74                                 cooling-device =
  75                                     <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
  76                         };
  77                 };
  78         };
  79 };