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Message-Id: <20221011175235.3191509-1-robh@kernel.org>
Date: Tue, 11 Oct 2022 12:52:35 -0500
From: Rob Herring <robh@...nel.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Amit Kucheria <amitk@...nel.org>,
Zhang Rui <rui.zhang@...el.com>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Laxman Dewangan <ldewangan@...dia.com>
Cc: linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] dt-bindings: thermal: Convert generic-adc-thermal to DT schema
Convert the 'generic-adc-thermal' binding to DT schema format.
The binding said '#thermal-sensor-cells' should be 1, but all in tree
users are 0 and 1 doesn't make sense for a single channel.
Drop the example's related providers and consumers of the
'generic-adc-thermal' node as the convention is to not have those in
the examples.
Signed-off-by: Rob Herring <robh@...nel.org>
---
.../bindings/thermal/generic-adc-thermal.yaml | 84 ++++++++++++++++
.../bindings/thermal/thermal-generic-adc.txt | 95 -------------------
2 files changed, 84 insertions(+), 95 deletions(-)
create mode 100644 Documentation/devicetree/bindings/thermal/generic-adc-thermal.yaml
delete mode 100644 Documentation/devicetree/bindings/thermal/thermal-generic-adc.txt
diff --git a/Documentation/devicetree/bindings/thermal/generic-adc-thermal.yaml b/Documentation/devicetree/bindings/thermal/generic-adc-thermal.yaml
new file mode 100644
index 000000000000..f1fc3b0d8608
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/generic-adc-thermal.yaml
@@ -0,0 +1,84 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/thermal/generic-adc-thermal.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: General Purpose Analog To Digital Converter (ADC) based thermal sensor
+
+maintainers:
+ - Laxman Dewangan <ldewangan@...dia.com>
+
+description:
+ On some of platforms, thermal sensor like thermistors are connected to
+ one of ADC channel and sensor resistance is read via voltage across the
+ sensor resistor. The voltage read across the sensor is mapped to
+ temperature using voltage-temperature lookup table.
+
+properties:
+ compatible:
+ const: generic-adc-thermal
+
+ '#thermal-sensor-cells':
+ const: 0
+
+ io-channels:
+ maxItems: 1
+
+ io-channel-names:
+ const: sensor-channel
+
+ temperature-lookup-table:
+ description: |
+ Lookup table to map the relation between ADC value and temperature.
+ When ADC is read, the value is looked up on the table to get the
+ equivalent temperature.
+
+ If not specified, driver assumes the ADC channel gives milliCelsius
+ directly.
+ $ref: /schemas/types.yaml#/definitions/int32-matrix
+ items:
+ items:
+ - description: Temperature in milliCelsius
+ - description: ADC read value
+
+required:
+ - compatible
+ - '#thermal-sensor-cells'
+ - io-channels
+ - io-channel-names
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/thermal/thermal.h>
+
+ thermal-sensor {
+ compatible = "generic-adc-thermal";
+ #thermal-sensor-cells = <0>;
+ io-channels = <&ads1015 1>;
+ io-channel-names = "sensor-channel";
+ temperature-lookup-table = <
+ (-40000) 2578
+ (-39000) 2577
+ (-38000) 2576
+ (-37000) 2575
+ (-36000) 2574
+ (-35000) 2573
+ (-34000) 2572
+ (-33000) 2571
+ (-32000) 2569
+ (-31000) 2568
+ (-30000) 2567
+ /* skip */
+ 118000 254
+ 119000 247
+ 120000 240
+ 121000 233
+ 122000 226
+ 123000 220
+ 124000 214
+ 125000 208>;
+ };
+...
diff --git a/Documentation/devicetree/bindings/thermal/thermal-generic-adc.txt b/Documentation/devicetree/bindings/thermal/thermal-generic-adc.txt
deleted file mode 100644
index e136946a2f4f..000000000000
--- a/Documentation/devicetree/bindings/thermal/thermal-generic-adc.txt
+++ /dev/null
@@ -1,95 +0,0 @@
-General Purpose Analog To Digital Converter (ADC) based thermal sensor.
-
-On some of platforms, thermal sensor like thermistors are connected to
-one of ADC channel and sensor resistance is read via voltage across the
-sensor resistor. The voltage read across the sensor is mapped to
-temperature using voltage-temperature lookup table.
-
-Required properties:
-===================
-- compatible: Must be "generic-adc-thermal".
-- #thermal-sensor-cells: Should be 1. See Documentation/devicetree/bindings/thermal/thermal-sensor.yaml for a description
- of this property.
-Optional properties:
-===================
-- temperature-lookup-table: Two dimensional array of Integer; lookup table
- to map the relation between ADC value and
- temperature. When ADC is read, the value is
- looked up on the table to get the equivalent
- temperature.
-
- The first value of the each row of array is the
- temperature in milliCelsius and second value of
- the each row of array is the ADC read value.
-
- If not specified, driver assumes the ADC channel
- gives milliCelsius directly.
-
-Example :
-#include <dt-bindings/thermal/thermal.h>
-
-i2c@...0c400 {
- ads1015: ads1015@4a {
- reg = <0x4a>;
- compatible = "ads1015";
- sampling-frequency = <3300>;
- #io-channel-cells = <1>;
- };
-};
-
-tboard_thermistor: thermal-sensor {
- compatible = "generic-adc-thermal";
- #thermal-sensor-cells = <0>;
- io-channels = <&ads1015 1>;
- io-channel-names = "sensor-channel";
- temperature-lookup-table = < (-40000) 2578
- (-39000) 2577
- (-38000) 2576
- (-37000) 2575
- (-36000) 2574
- (-35000) 2573
- (-34000) 2572
- (-33000) 2571
- (-32000) 2569
- (-31000) 2568
- (-30000) 2567
- ::::::::::
- 118000 254
- 119000 247
- 120000 240
- 121000 233
- 122000 226
- 123000 220
- 124000 214
- 125000 208>;
-};
-
-dummy_cool_dev: dummy-cool-dev {
- compatible = "dummy-cooling-dev";
- #cooling-cells = <2>; /* min followed by max */
-};
-
-thermal-zones {
- Tboard {
- polling-delay = <15000>; /* milliseconds */
- polling-delay-passive = <0>; /* milliseconds */
- thermal-sensors = <&tboard_thermistor>;
-
- trips {
- therm_est_trip: therm_est_trip {
- temperature = <40000>;
- type = "active";
- hysteresis = <1000>;
- };
- };
-
- cooling-maps {
- map0 {
- trip = <&therm_est_trip>;
- cooling-device = <&dummy_cool_dev THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
- contribution = <100>;
- };
-
- };
- };
-};
--
2.35.1
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