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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/thermal/ti,j72xx-thermal.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Texas Instruments J72XX VTM (DTS)
maintainers:
- Keerthy <j-keerthy@ti.com>
description: |
The TI K3 family of SoCs typically have a Voltage & Thermal
Management (VTM) device to control up to 8 temperature diode
sensors to measure silicon junction temperatures from different
hotspots of the chip as well as provide temperature, interrupt
and alerting information.
The following polynomial equation can then be used to convert
value returned by this device into a temperature in Celsius
Temp(C) = (-9.2627e-12) * x^4 + (6.0373e-08) * x^3 + \
(-1.7058e-04) * x^2 + (3.2512e-01) * x + (-4.9003e+01)
$ref: thermal-sensor.yaml#
properties:
compatible:
enum:
- ti,j721e-vtm
- ti,j7200-vtm
reg:
items:
- description: VTM cfg1 register space
- description: VTM cfg2 register space
- description: |
A software trimming method must be applied to some Jacinto
devices to function properly. This eFuse region provides
the information needed for these SoCs to report
temperatures accurately.
minItems: 2
power-domains:
maxItems: 1
"#thermal-sensor-cells":
const: 1
allOf:
- if:
properties:
compatible:
contains:
const: ti,j721e-vtm
then:
properties:
reg:
minItems: 3
else:
properties:
reg:
maxItems: 2
required:
- compatible
- reg
- power-domains
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/soc/ti,sci_pm_domain.h>
wkup_vtm0: thermal-sensor@42040000 {
compatible = "ti,j721e-vtm";
reg = <0x42040000 0x350>,
<0x42050000 0x350>,
<0x43000300 0x10>;
power-domains = <&k3_pds 154 TI_SCI_PD_EXCLUSIVE>;
#thermal-sensor-cells = <1>;
};
mpu_thermal: mpu-thermal {
polling-delay-passive = <250>; /* milliseconds */
polling-delay = <500>; /* milliseconds */
thermal-sensors = <&wkup_vtm0 0>;
trips {
mpu_crit: mpu-crit {
temperature = <125000>; /* milliCelsius */
hysteresis = <2000>; /* milliCelsius */
type = "critical";
};
};
};
...
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