1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/thermal/ti,j72xx-thermal.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Texas Instruments J72XX VTM (DTS)
8
9 maintainers:
10 - Keerthy <j-keerthy@ti.com>
11
12 description: |
13 The TI K3 family of SoCs typically have a Voltage & Thermal
14 Management (VTM) device to control up to 8 temperature diode
15 sensors to measure silicon junction temperatures from different
16 hotspots of the chip as well as provide temperature, interrupt
17 and alerting information.
18
19 The following polynomial equation can then be used to convert
20 value returned by this device into a temperature in Celsius
21
22 Temp(C) = (-9.2627e-12) * x^4 + (6.0373e-08) * x^3 + \
23 (-1.7058e-04) * x^2 + (3.2512e-01) * x + (-4.9003e+01)
24
25 $ref: thermal-sensor.yaml#
26
27 properties:
28 compatible:
29 enum:
30 - ti,j721e-vtm
31 - ti,j7200-vtm
32
33 reg:
34 items:
35 - description: VTM cfg1 register space
36 - description: VTM cfg2 register space
37 - description: |
38 A software trimming method must be applied to some Jacinto
39 devices to function properly. This eFuse region provides
40 the information needed for these SoCs to report
41 temperatures accurately.
42 minItems: 2
43
44 power-domains:
45 maxItems: 1
46
47 "#thermal-sensor-cells":
48 const: 1
49
50 allOf:
51 - if:
52 properties:
53 compatible:
54 contains:
55 const: ti,j721e-vtm
56 then:
57 properties:
58 reg:
59 minItems: 3
60 else:
61 properties:
62 reg:
63 maxItems: 2
64
65 required:
66 - compatible
67 - reg
68 - power-domains
69
70 unevaluatedProperties: false
71
72 examples:
73 - |
74 #include <dt-bindings/soc/ti,sci_pm_domain.h>
75 wkup_vtm0: thermal-sensor@42040000 {
76 compatible = "ti,j721e-vtm";
77 reg = <0x42040000 0x350>,
78 <0x42050000 0x350>,
79 <0x43000300 0x10>;
80 power-domains = <&k3_pds 154 TI_SCI_PD_EXCLUSIVE>;
81 #thermal-sensor-cells = <1>;
82 };
83
84 mpu_thermal: mpu-thermal {
85 polling-delay-passive = <250>; /* milliseconds */
86 polling-delay = <500>; /* milliseconds */
87 thermal-sensors = <&wkup_vtm0 0>;
88
89 trips {
90 mpu_crit: mpu-crit {
91 temperature = <125000>; /* milliCelsius */
92 hysteresis = <2000>; /* milliCelsius */
93 type = "critical";
94 };
95 };
96 };
97 ...
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