linux-kernel - [PATCH v2 1/3] dt-bindings: thermal: Add yaml bindings for thermal sensors

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Date:   Thu,  5 Mar 2020 18:26:41 +0530
From:   Amit Kucheria <amit.kucheria@...aro.org>
To:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        swboyd@...omium.org, mka@...omium.org, daniel.lezcano@...aro.org,
        Amit Kucheria <amit.kucheria@...durent.com>,
        Zhang Rui <rui.zhang@...el.com>
Cc:     linux-pm@...r.kernel.org, devicetree@...r.kernel.org
Subject: [PATCH v2 1/3] dt-bindings: thermal: Add yaml bindings for thermal sensors

As part of moving the thermal bindings to YAML, split it up into 3
bindings: thermal sensors, cooling devices and thermal zones.

The property #thermal-sensor-cells is required in each device that acts
as a thermal sensor. It is used to uniquely identify the instance of the
thermal sensor inside the system.

Signed-off-by: Amit Kucheria <amit.kucheria@...aro.org>
---
 .../bindings/thermal/thermal-sensor.yaml      | 72 +++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/thermal/thermal-sensor.yaml

diff --git a/Documentation/devicetree/bindings/thermal/thermal-sensor.yaml b/Documentation/devicetree/bindings/thermal/thermal-sensor.yaml
new file mode 100644
index 0000000000000..920ee7667591d
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/thermal-sensor.yaml
@@ -0,0 +1,72 @@
+# 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@...nel.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 artively
+   - 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@...3000 {
+                    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@...5000 {
+                    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>;
+            };
+    };
+...
-- 
2.20.1