[PATCH 3/6] dt-bindings: thermal: r9a08g045-tsu: Document the TSU unit

Claudiu
2025-01-03T16:38:35Z

From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

The Renesas RZ/G3S SoC includes a Thermal Sensor Unit (TSU) block designed
to measure the junction temperature. The temperature is measured using
the RZ/G3S ADC, with a dedicated ADC channel directly connected to the TSU.
Add documentation for it.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
---
.../thermal/renesas,r9a08g045-tsu.yaml | 93 +++++++++++++++++++
1 file changed, 93 insertions(+)
create mode 100644 Documentation/devicetree/bindings/thermal/renesas,r9a08g045-tsu.yaml

diff --git a/Documentation/devicetree/bindings/thermal/renesas,r9a08g045-tsu.yaml b/Documentation/devicetree/bindings/thermal/renesas,r9a08g045-tsu.yaml
new file mode 100644
index 000000000000..573e2b9d3752
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/renesas,r9a08g045-tsu.yaml
@@ -0,0 +1,93 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/thermal/renesas,r9a08g045-tsu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas RZ/G3S Thermal Sensor Unit
+
+description:
+ The thermal sensor unit (TSU) measures the temperature(Tj) inside
+ the LSI.
+
+maintainers:
+ - Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
+
+$ref: thermal-sensor.yaml#
+
+properties:
+ compatible:
+ const: renesas,r9a08g045-tsu
+
+ reg:
+ maxItems: 1
+
+ clocks:
+ items:
+ - description: TSU module clock
+
+ power-domains:
+ maxItems: 1
+
+ resets:
+ items:
+ - description: TSU module reset
+
+ io-channels:
+ items:
+ - description: ADC channel which reports the TSU temperature
+
+ io-channel-names:
+ items:
+ - const: tsu
+
+ "#thermal-sensor-cells":
+ const: 0
+
+required:
+ - compatible
+ - reg
+ - clocks
+ - power-domains
+ - resets
+ - io-channels
+ - io-channel-names
+ - '#thermal-sensor-cells'
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/clock/r9a08g045-cpg.h>
+
+ tsu: thermal@10059000 {
+ compatible = "renesas,r9a08g045-tsu";
+ reg = <0x10059000 0x1000>;
+ clocks = <&cpg CPG_MOD R9A08G045_TSU_PCLK>;
+ resets = <&cpg R9A08G045_TSU_PRESETN>;
+ power-domains = <&cpg>;
+ #thermal-sensor-cells = <0>;
+ io-channels = <&adc 8>;
+ io-channel-names = "tsu";
+ };
+
+ thermal-zones {
+ cpu-thermal {
+ polling-delay-passive = <250>;
+ polling-delay = <1000>;
+ thermal-sensors = <&tsu>;
+
+ trips {
+ sensor_crit: sensor-crit {
+ temperature = <125000>;
+ hysteresis = <1000>;
+ type = "critical";
+ };
+ target: trip-point {
+ temperature = <100000>;
+ hysteresis = <1000>;
+ type = "passive";
+ };
+ };
+ };
+ };
--
2.43.0