xref: /linux/Documentation/devicetree/bindings/thermal/qcom-spmi-adc-tm-hc.yaml (revision a1ff5a7d78a036d6c2178ee5acd6ba4946243800) 
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
7title: Qualcomm's SPMI PMIC ADC HC Thermal Monitoring
8maintainers:
9  - Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
10
11$ref: thermal-sensor.yaml#
12
13properties:
14  compatible:
15    const: qcom,spmi-adc-tm-hc
16
17  reg:
18    maxItems: 1
19
20  interrupts:
21    maxItems: 1
22
23  "#thermal-sensor-cells":
24    const: 1
25
26  "#address-cells":
27    const: 1
28
29  "#size-cells":
30    const: 0
31
32  qcom,avg-samples:
33    $ref: /schemas/types.yaml#/definitions/uint32
34    description: Number of samples to be used for measurement.
35    enum:
36      - 1
37      - 2
38      - 4
39      - 8
40      - 16
41    default: 1
42
43  qcom,decimation:
44    $ref: /schemas/types.yaml#/definitions/uint32
45    description: This parameter is used to decrease ADC sampling rate.
46            Quicker measurements can be made by reducing decimation ratio.
47    enum:
48      - 256
49      - 512
50      - 1024
51    default: 1024
52
53patternProperties:
54  "^([-a-z0-9]*)@[0-7]$":
55    type: object
56    description:
57      Represent one thermal sensor.
58
59    properties:
60      reg:
61        description: Specify the sensor channel. There are 8 channels in PMIC5's ADC TM
62        minimum: 0
63        maximum: 7
64
65      io-channels:
66        description:
67          From common IIO binding. Used to pipe PMIC ADC channel to thermal monitor
68
69      qcom,ratiometric:
70        $ref: /schemas/types.yaml#/definitions/flag
71        description:
72          Channel calibration type.
73          If this property is specified VADC will use the VDD reference
74          (1.875V) and GND for channel calibration. If property is not found,
75          channel will be calibrated with 0V and 1.25V reference channels,
76          also known as absolute calibration.
77
78      qcom,hw-settle-time-us:
79        description: Time between AMUX getting configured and the ADC starting conversion.
80        enum: [0, 100, 200, 300, 400, 500, 600, 700, 1000, 2000, 4000, 6000, 8000, 10000]
81
82      qcom,pre-scaling:
83        $ref: /schemas/types.yaml#/definitions/uint32-array
84        description: Used for scaling the channel input signal before the
85          signal is fed to VADC. The configuration for this node is to know the
86          pre-determined ratio and use it for post scaling. It is a pair of
87          integers, denoting the numerator and denominator of the fraction by
88          which input signal is multiplied. For example, <1 3> indicates the
89          signal is scaled down to 1/3 of its value before ADC measurement.  If
90          property is not found default value depending on chip will be used.
91        items:
92          - const: 1
93          - enum: [ 1, 3, 4, 6, 20, 8, 10 ]
94
95    required:
96      - reg
97      - io-channels
98
99    additionalProperties:
100      false
101
102required:
103  - compatible
104  - reg
105  - interrupts
106  - "#address-cells"
107  - "#size-cells"
108
109unevaluatedProperties: false
110
111examples:
112  - |
113    #include <dt-bindings/iio/qcom,spmi-vadc.h>
114    #include <dt-bindings/interrupt-controller/irq.h>
115
116    pmic {
117        #address-cells = <1>;
118        #size-cells = <0>;
119
120        pm8998_adc: adc@3100 {
121            compatible = "qcom,spmi-adc-rev2";
122            reg = <0x3100>;
123            #address-cells = <1>;
124            #size-cells = <0>;
125            #io-channel-cells = <1>;
126
127            /* Other properties are omitted */
128            channel@4c {
129                reg = <ADC5_XO_THERM_100K_PU>;
130            };
131        };
132
133        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...
150