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 $ref: thermal-sensor.yaml#
12
13 properties:
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 $ref: /schemas/types.yaml#/definitions/uint32
45 description: This parameter is used to decrease ADC sampling rate.
46 Quicker measurements can be made by reducing decimation ratio.
47 enum:
48 - 256
49 - 512
50 - 1024
51 default: 1024
52
53 patternProperties:
54 "^([-a-z0-9]*)@[0-7]$":
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
102 required:
103 - compatible
104 - reg
105 - interrupts
106 - "#address-cells"
107 - "#size-cells"
108
109 unevaluatedProperties: false
110
111 examples:
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 ...
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