xref: /linux/Documentation/devicetree/bindings/thermal/qcom-spmi-adc-tm-hc.yaml (revision 4b660dbd9ee2059850fd30e0df420ca7a38a1856) 
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
11properties:
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    $ref: /schemas/types.yaml#/definitions/uint32
46    description: This parameter is used to decrease ADC sampling rate.
47            Quicker measurements can be made by reducing decimation ratio.
48    enum:
49      - 256
50      - 512
51      - 1024
52    default: 1024
53
54patternProperties:
55  "^([-a-z0-9]*)@[0-7]$":
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
103required:
104  - compatible
105  - reg
106  - interrupts
107  - "#address-cells"
108  - "#size-cells"
109  - "#thermal-sensor-cells"
110
111additionalProperties: false
112
113examples:
114  - |
115    #include <dt-bindings/iio/qcom,spmi-vadc.h>
116    #include <dt-bindings/interrupt-controller/irq.h>
117
118    pmic {
119        #address-cells = <1>;
120        #size-cells = <0>;
121
122        pm8998_adc: adc@3100 {
123            compatible = "qcom,spmi-adc-rev2";
124            reg = <0x3100>;
125            #address-cells = <1>;
126            #size-cells = <0>;
127            #io-channel-cells = <1>;
128
129            /* Other properties are omitted */
130            channel@4c {
131                reg = <ADC5_XO_THERM_100K_PU>;
132            };
133        };
134
135        adc-tm@3400 {
136            compatible = "qcom,spmi-adc-tm-hc";
137            reg = <0x3400>;
138            interrupts = <0x2 0x34 0x0 IRQ_TYPE_EDGE_RISING>;
139            #thermal-sensor-cells = <1>;
140            #address-cells = <1>;
141            #size-cells = <0>;
142
143            thermistor@1 {
144                reg = <1>;
145                io-channels = <&pm8998_adc ADC5_XO_THERM_100K_PU>;
146                qcom,ratiometric;
147                qcom,hw-settle-time-us = <200>;
148            };
149        };
150    };
151...
152