dt-bindings: thermal: Add yaml bindings for thermal sensors

# SPDX-License-Identifier: (GPL-2.0)

# Copyright 2020 Linaro Ltd.

%YAML 1.2

---

$id: http://devicetree.org/schemas/thermal/thermal-sensor.yaml#

$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Thermal sensor binding

maintainers:

  - Amit Kucheria <amitk@kernel.org>

description: |

  Thermal management is achieved in devicetree by describing the sensor hardware

  and the software abstraction of thermal zones required to take appropriate

  action to mitigate thermal overloads.

  The following node types are used to completely describe a thermal management

  system in devicetree:

   - thermal-sensor: device that measures temperature, has SoC-specific bindings

   - cooling-device: device used to dissipate heat either passively or actively

   - thermal-zones: a container of the following node types used to describe all

     thermal data for the platform

  This binding describes the thermal-sensor.

  Thermal sensor devices provide temperature sensing capabilities on thermal

  zones. Typical devices are I2C ADC converters and bandgaps. Thermal sensor

  devices may control one or more internal sensors.

properties:

  "#thermal-sensor-cells":

    description:

      Used to uniquely identify a thermal sensor instance within an IC. Will be

      0 on sensor nodes with only a single sensor and at least 1 on nodes

      containing several internal sensors.

    enum: [0, 1]

examples:

  - |

    #include <dt-bindings/interrupt-controller/arm-gic.h>

    // Example 1: SDM845 TSENS

    soc: soc@0 {

            #address-cells = <2>;

            #size-cells = <2>;

            /* ... */

            tsens0: thermal-sensor@c263000 {

                    compatible = "qcom,sdm845-tsens", "qcom,tsens-v2";

                    reg = <0 0x0c263000 0 0x1ff>, /* TM */

                          <0 0x0c222000 0 0x1ff>; /* SROT */

                    #qcom,sensors = <13>;

                    interrupts = <GIC_SPI 506 IRQ_TYPE_LEVEL_HIGH>,

                                 <GIC_SPI 508 IRQ_TYPE_LEVEL_HIGH>;

                    interrupt-names = "uplow", "critical";

                    #thermal-sensor-cells = <1>;

            };

            tsens1: thermal-sensor@c265000 {

                    compatible = "qcom,sdm845-tsens", "qcom,tsens-v2";

                    reg = <0 0x0c265000 0 0x1ff>, /* TM */

                          <0 0x0c223000 0 0x1ff>; /* SROT */

                    #qcom,sensors = <8>;

                    interrupts = <GIC_SPI 507 IRQ_TYPE_LEVEL_HIGH>,

                                 <GIC_SPI 509 IRQ_TYPE_LEVEL_HIGH>;

                    interrupt-names = "uplow", "critical";

                    #thermal-sensor-cells = <1>;

            };

    };

...