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authorDmitry Osipenko <digetx@gmail.com>2021-06-16 22:04:12 +0300
committerDaniel Lezcano <daniel.lezcano@linaro.org>2021-07-04 19:28:04 +0300
commit1aab6b81af3c96e3181911140d2528e112335bef (patch)
tree03a8c90917bee07526fde5071ad8b6f5ee42c9e9 /Documentation/devicetree
parentd8ac5bb4ae653e092d7429a7587b73f1662d6ad7 (diff)
downloadlinux-1aab6b81af3c96e3181911140d2528e112335bef.tar.xz
dt-bindings: thermal: Add binding for Tegra30 thermal sensor
All NVIDIA Tegra30 SoCs have on-chip sensors which monitor temperature and voltage of the SoC. Sensors also controls CPU x2 freq throttle and emits emergency shutdown signal. TSENSOR has has two separate channels for each sensor placed in a different parts of the SoC. Add binding for the sensor hardware. Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20210616190417.32214-2-digetx@gmail.com
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/thermal/nvidia,tegra30-tsensor.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NVIDIA Tegra30 Thermal Sensor
+
+maintainers:
+ - Dmitry Osipenko <digetx@gmail.com>
+ - Jon Hunter <jonathanh@nvidia.com>
+ - Thierry Reding <thierry.reding@gmail.com>
+
+description: |
+ TSENSOR provides thermal and voltage sensors which monitor temperature
+ and voltage of the chip. Sensors are placed across the die to gauge the
+ temperature of the whole chip. The TSENSOR module:
+
+ Generates an interrupt to SW to lower temperature via DVFS on reaching
+ a certain thermal/voltage threshold.
+
+ Generates a signal to the CAR to reduce CPU frequency by half on reaching
+ a certain thermal/voltage threshold.
+
+ Generates a signal to the PMC when the temperature reaches dangerously high
+ levels to reset the chip and sets a flag in the PMC.
+
+ TSENSOR has two channels which monitor two different spots of the SoC.
+
+properties:
+ compatible:
+ const: nvidia,tegra30-tsensor
+
+ reg:
+ maxItems: 1
+
+ clocks:
+ maxItems: 1
+
+ resets:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ "#thermal-sensor-cells":
+ const: 1
+
+ assigned-clock-parents: true
+ assigned-clock-rates: true
+ assigned-clocks: true
+
+required:
+ - compatible
+ - reg
+ - clocks
+ - resets
+ - interrupts
+ - "#thermal-sensor-cells"
+
+additionalProperties: false
+
+examples:
+ - |
+ thermal-sensor@70014000 {
+ compatible = "nvidia,tegra30-tsensor";
+ reg = <0x70014000 0x500>;
+ interrupts = <0 102 4>;
+ clocks = <&clk 100>;
+ resets = <&rst 100>;
+
+ #thermal-sensor-cells = <1>;
+ };