qcom-spmi-adc-tm-hc.yaml

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    1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/thermal/qcom-spmi-adc-tm-hc.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: Qualcomm's SPMI PMIC ADC HC Thermal Monitoring
    8 maintainers:
    9   - Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
   10 
   11 properties:
   12   compatible:
   13     const: qcom,spmi-adc-tm-hc
   14 
   15   reg:
   16     maxItems: 1
   17 
   18   interrupts:
   19     maxItems: 1
   20 
   21   "#thermal-sensor-cells":
   22     const: 1
   23     description:
   24       Number of cells required to uniquely identify the thermal sensors. Since
   25       we have multiple sensors this is set to 1
   26 
   27   "#address-cells":
   28     const: 1
   29 
   30   "#size-cells":
   31     const: 0
   32 
   33   qcom,avg-samples:
   34     $ref: /schemas/types.yaml#/definitions/uint32
   35     description: Number of samples to be used for measurement.
   36     enum:
   37       - 1
   38       - 2
   39       - 4
   40       - 8
   41       - 16
   42     default: 1
   43 
   44   qcom,decimation:
   45     $ref: /schemas/types.yaml#/definitions/uint32
   46     description: This parameter is used to decrease ADC sampling rate.
   47             Quicker measurements can be made by reducing decimation ratio.
   48     enum:
   49       - 256
   50       - 512
   51       - 1024
   52     default: 1024
   53 
   54 patternProperties:
   55   "^([-a-z0-9]*)@[0-7]$":
   56     type: object
   57     description:
   58       Represent one thermal sensor.
   59 
   60     properties:
   61       reg:
   62         description: Specify the sensor channel. There are 8 channels in PMIC5's ADC TM
   63         minimum: 0
   64         maximum: 7
   65 
   66       io-channels:
   67         description:
   68           From common IIO binding. Used to pipe PMIC ADC channel to thermal monitor
   69 
   70       qcom,ratiometric:
   71         $ref: /schemas/types.yaml#/definitions/flag
   72         description:
   73           Channel calibration type.
   74           If this property is specified VADC will use the VDD reference
   75           (1.875V) and GND for channel calibration. If property is not found,
   76           channel will be calibrated with 0V and 1.25V reference channels,
   77           also known as absolute calibration.
   78 
   79       qcom,hw-settle-time-us:
   80         description: Time between AMUX getting configured and the ADC starting conversion.
   81         enum: [0, 100, 200, 300, 400, 500, 600, 700, 1000, 2000, 4000, 6000, 8000, 10000]
   82 
   83       qcom,pre-scaling:
   84         $ref: /schemas/types.yaml#/definitions/uint32-array
   85         description: Used for scaling the channel input signal before the
   86           signal is fed to VADC. The configuration for this node is to know the
   87           pre-determined ratio and use it for post scaling. It is a pair of
   88           integers, denoting the numerator and denominator of the fraction by
   89           which input signal is multiplied. For example, <1 3> indicates the
   90           signal is scaled down to 1/3 of its value before ADC measurement.  If
   91           property is not found default value depending on chip will be used.
   92         items:
   93           - const: 1
   94           - enum: [ 1, 3, 4, 6, 20, 8, 10 ]
   95 
   96     required:
   97       - reg
   98       - io-channels
   99 
  100     additionalProperties:
  101       false
  102 
  103 required:
  104   - compatible
  105   - reg
  106   - interrupts
  107   - "#address-cells"
  108   - "#size-cells"
  109   - "#thermal-sensor-cells"
  110 
  111 additionalProperties: false
  112 
  113 examples:
  114   - |
  115     #include <dt-bindings/iio/qcom,spmi-vadc.h>
  116     #include <dt-bindings/interrupt-controller/irq.h>
  117     spmi_bus {
  118         #address-cells = <1>;
  119         #size-cells = <0>;
  120         pm8998_adc: adc@3100 {
  121             reg = <0x3100>;
  122             compatible = "qcom,spmi-adc-rev2";
  123             #address-cells = <1>;
  124             #size-cells = <0>;
  125             #io-channel-cells = <1>;
  126 
  127             /* Other propreties are omitted */
  128             adc-chan@4c {
  129                 reg = <ADC5_XO_THERM_100K_PU>;
  130             };
  131         };
  132 
  133         pm8998_adc_tm: adc-tm@3400 {
  134             compatible = "qcom,spmi-adc-tm-hc";
  135             reg = <0x3400>;
  136             interrupts = <0x2 0x34 0x0 IRQ_TYPE_EDGE_RISING>;
  137             #thermal-sensor-cells = <1>;
  138             #address-cells = <1>;
  139             #size-cells = <0>;
  140 
  141             thermistor@1 {
  142                 reg = <1>;
  143                 io-channels = <&pm8998_adc ADC5_XO_THERM_100K_PU>;
  144                 qcom,ratiometric;
  145                 qcom,hw-settle-time-us = <200>;
  146             };
  147         };
  148     };
  149 ...

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sys/contrib/device-tree/Bindings/thermal/qcom-spmi-adc-tm-hc.yaml