[PATCH v2 02/13] dt-bindings: thermal: tegra: Document throttle temperature

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From: Thierry Reding <treding@xxxxxxxxxx>

Each throttling configuration needs to specify the temperature threshold
at which it should start throttling. Previously this was tied to a given
trip point as a cooling device and used the temperature specified for
that trip point. This doesn't work well because the throttling mechanism
is not a cooling device in the traditional sense.

Instead, allow device trees to specify the throttle temperature in the
throttle configuration directly so that the throttle doesn't need to be
exposed as a cooling device.

Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
Changes in v2:
- rename temperature to temperature-millicelsius and drop $ref
- add hysteresis-millicelsius property

 .../bindings/thermal/nvidia,tegra124-soctherm.yaml | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.yaml b/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.yaml
index 04a2ba1aa946..0eb6277082fe 100644
--- a/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.yaml
+++ b/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.yaml
@@ -121,6 +121,20 @@ properties:
               # high (85%, TEGRA_SOCTHERM_THROT_LEVEL_HIGH)
               - 3
 
+          temperature-millicelsius:
+            minimum: -273000
+            maximum: 200000
+            description: The temperature threshold (in millicelsius) that,
+              when crossed, will trigger the configured automatic throttling.
+
+          hysteresis-millicelsius:
+            description: An unsigned integer expressing the hysteresis delta
+              (in millicelsius) with respect to the threshold temperature
+              property above. Throttling will be initiated when the
+              temperature falls below (temperature - hysteresis). This avoids
+              situations where throttling is repeatedly initiated and stopped
+              because of minor temperature variations.
+
           # optional
           # Tegra210 specific and valid only for OCx throttle events
           nvidia,count-threshold:
-- 
2.42.0





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