| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 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 | properties: |
| 26 | compatible: |
| 27 | enum: |
| 28 | - ti,j721e-vtm |
| 29 | - ti,j7200-vtm |
| 30 | |
| 31 | reg: |
| 32 | items: |
| 33 | - description: VTM cfg1 register space |
| 34 | - description: VTM cfg2 register space |
| 35 | - description: | |
| 36 | A software trimming method must be applied to some Jacinto |
| 37 | devices to function properly. This eFuse region provides |
| 38 | the information needed for these SoCs to report |
| 39 | temperatures accurately. |
| 40 | minItems: 2 |
| 41 | |
| 42 | power-domains: |
| 43 | maxItems: 1 |
| 44 | |
| 45 | "#thermal-sensor-cells": |
| 46 | const: 1 |
| 47 | |
| 48 | allOf: |
| 49 | - if: |
| 50 | properties: |
| 51 | compatible: |
| 52 | contains: |
| 53 | const: ti,j721e-vtm |
| 54 | then: |
| 55 | properties: |
| 56 | reg: |
| 57 | minItems: 3 |
| 58 | else: |
| 59 | properties: |
| 60 | reg: |
| 61 | maxItems: 2 |
| 62 | |
| 63 | required: |
| 64 | - compatible |
| 65 | - reg |
| 66 | - power-domains |
| 67 | - "#thermal-sensor-cells" |
| 68 | |
| 69 | additionalProperties: false |
| 70 | |
| 71 | examples: |
| 72 | - | |
| 73 | #include <dt-bindings/soc/ti,sci_pm_domain.h> |
| 74 | wkup_vtm0: thermal-sensor@42040000 { |
| 75 | compatible = "ti,j721e-vtm"; |
| 76 | reg = <0x42040000 0x350>, |
| 77 | <0x42050000 0x350>, |
| 78 | <0x43000300 0x10>; |
| 79 | power-domains = <&k3_pds 154 TI_SCI_PD_EXCLUSIVE>; |
| 80 | #thermal-sensor-cells = <1>; |
| 81 | }; |
| 82 | |
| 83 | mpu_thermal: mpu-thermal { |
| 84 | polling-delay-passive = <250>; /* milliseconds */ |
| 85 | polling-delay = <500>; /* milliseconds */ |
| 86 | thermal-sensors = <&wkup_vtm0 0>; |
| 87 | |
| 88 | trips { |
| 89 | mpu_crit: mpu-crit { |
| 90 | temperature = <125000>; /* milliCelsius */ |
| 91 | hysteresis = <2000>; /* milliCelsius */ |
| 92 | type = "critical"; |
| 93 | }; |
| 94 | }; |
| 95 | }; |
| 96 | ... |