linux-kernel - [PATCH v3 1/2] dt-bindings: Add DT bindings for the DT-based virtual sensor driver

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Date:   Fri, 29 Oct 2021 17:08:56 +0200
From:   Alexandre Bailon <abailon@...libre.com>
To:     rafael@...nel.org, rui.zhang@...el.com, daniel.lezcano@...aro.org,
        amitk@...nel.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        ben.tseng@...iatek.com, khilman@...libre.com, mka@...omium.org,
        Alexandre Bailon <abailon@...libre.com>
Subject: [PATCH v3 1/2] dt-bindings: Add DT bindings for the DT-based virtual sensor driver

This adds the DT bindings for the DT-based virtual sensor driver.
This driver provides a way, using DT, to aggregate the temperature
of multiple thermal zones and get some useful data from it.

Signed-off-by: Alexandre Bailon <abailon@...libre.com>
---
 .../thermal/virtual,thermal-sensor.yaml       | 86 +++++++++++++++++++
 include/dt-bindings/thermal/virtual-sensor.h  | 15 ++++
 2 files changed, 101 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/thermal/virtual,thermal-sensor.yaml
 create mode 100644 include/dt-bindings/thermal/virtual-sensor.h

diff --git a/Documentation/devicetree/bindings/thermal/virtual,thermal-sensor.yaml b/Documentation/devicetree/bindings/thermal/virtual,thermal-sensor.yaml
new file mode 100644
index 000000000000..b404fd4b2b38
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/virtual,thermal-sensor.yaml
@@ -0,0 +1,86 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright 2021 BayLibre
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/thermal/virtual,thermal-sensor.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Virtual thermal sensor binding
+
+maintainers:
+  - Alexandre Bailon <abailon@...libre.com>
+
+description: |
+  The virtual thermal sensor device provides a way to aggregate the temperature
+  from multiple thermal zones. Basically, this could be used to get the
+  maximum, minimum or average temperature.
+
+allOf:
+  - $ref: thermal-sensor.yaml#
+
+properties:
+  compatible:
+    const: virtual,thermal-sensor
+
+  aggregation-function:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Used to select the operations to perform on the sensors to get the virtual
+      sensor temperature.
+    enum:
+      - VIRTUAL_THERMAL_SENSOR_MIN_VAL
+      - VIRTUAL_THERMAL_SENSOR_MAX_VAL
+      - VIRTUAL_THERMAL_SENSOR_AVG_VAL
+
+  thermal-sensors:
+    $ref: /schemas/types.yaml#/definitions/string-array
+    description:
+      The names of the thermal zone to aggregate.
+
+required:
+  - aggregation-function
+  - thermal-sensors
+
+additionalProperties: true
+
+examples:
+  - |
+    #include <dt-bindings/thermal/thermal.h>
+    #include <dt-bindings/thermal/virtual-sensor.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/mt8192-clk.h>
+
+    lvts: lvts@...0b000 {
+        compatible = "mediatek,mt6873-lvts";
+        reg = <0x1100b000 0x1000>;
+        clocks = <&infracfg CLK_INFRA_THERM>;
+        clock-names = "lvts_clk";
+        #thermal-sensor-cells = <1>;
+        interrupts = <GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH>;
+    };
+
+    cpu_max_sensor: cpu_max_sensor {
+      compatible = "virtual,thermal-sensor";
+      #thermal-sensor-cells = <1>;
+      aggregation-function = <VIRTUAL_THERMAL_SENSOR_MAX_VAL>;
+      thermal-sensors = "cpu1", "cpu2";
+    };
+
+    thermal_zones: thermal-zones {
+      cpu1 {
+        polling-delay = <0>; /* milliseconds */
+        polling-delay-passive = <0>; /* milliseconds */
+        thermal-sensors = <&lvts 0>;
+      };
+      cpu2 {
+        polling-delay = <0>; /* milliseconds */
+        polling-delay-passive = <0>; /* milliseconds */
+        thermal-sensors = <&lvts 1>;
+      };
+      cpu_max {
+        polling-delay = <0>; /* milliseconds */
+        polling-delay-passive = <0>; /* milliseconds */
+        thermal-sensors = <&cpu_max_sensor 0>;
+      };
+    };
+...
diff --git a/include/dt-bindings/thermal/virtual-sensor.h b/include/dt-bindings/thermal/virtual-sensor.h
new file mode 100644
index 000000000000..6254b2aa8f5c
--- /dev/null
+++ b/include/dt-bindings/thermal/virtual-sensor.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * This header provides constants for virtual thermal sensor bindings.
+ *
+ * Copyright (C) 2021 BayLibre
+ */
+
+#ifndef _DT_BINDINGS_THERMAL_VIRTUAL_SENSOR_H
+#define _DT_BINDINGS_THERMAL_VIRTUAL_SENSOR_H
+
+#define VIRTUAL_THERMAL_SENSOR_MIN_VAL 0
+#define VIRTUAL_THERMAL_SENSOR_MAX_VAL 1
+#define VIRTUAL_THERMAL_SENSOR_AVG_VAL 2
+
+#endif /* _DT_BINDINGS_THERMAL_VIRTUAL_SENSOR_H */
-- 
2.32.0