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From: Thierry Reding <thierry.reding@gmail.com>
To: Daniel Lezcano <daniel.lezcano@linaro.org>,
	"Rafael J . Wysocki" <rafael@kernel.org>,
	Thierry Reding <thierry.reding@gmail.com>,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>
Cc: Amit Kucheria <amitk@kernel.org>, Zhang Rui <rui.zhang@intel.com>,
	Jon Hunter <jonathanh@nvidia.com>,
	linux-pm@vger.kernel.org, devicetree@vger.kernel.org,
	linux-tegra@vger.kernel.org
Subject: [PATCH v2 02/13] dt-bindings: thermal: tegra: Document throttle temperature
Date: Thu, 12 Oct 2023 19:58:23 +0200	[thread overview]
Message-ID: <20231012175836.3408077-3-thierry.reding@gmail.com> (raw)
In-Reply-To: <20231012175836.3408077-1-thierry.reding@gmail.com>

From: Thierry Reding <treding@nvidia.com>

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@nvidia.com>
---
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


  parent reply	other threads:[~2023-10-12 17:58 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-10-12 17:58 [PATCH v2 00/13] thermal: tegra: Do not register cooling device Thierry Reding
2023-10-12 17:58 ` [PATCH v2 01/13] thermal: Store device tree node for thermal zone devices Thierry Reding
2023-10-12 17:58 ` Thierry Reding [this message]
2023-10-16 14:02   ` [PATCH v2 02/13] dt-bindings: thermal: tegra: Document throttle temperature Rob Herring
2023-11-10 13:58     ` Thierry Reding
2023-10-12 17:58 ` [PATCH v2 03/13] dt-bindings: thermal: tegra: Add nvidia,thermal-zones property Thierry Reding
2023-10-13 15:59   ` Daniel Lezcano
2023-10-12 17:58 ` [PATCH v2 04/13] thermal: tegra: Use driver-private data consistently Thierry Reding
2023-10-13  8:04   ` Daniel Lezcano
2023-10-13 11:40     ` Thierry Reding
2023-10-12 17:58 ` [PATCH v2 05/13] thermal: tegra: Constify SoC-specific data Thierry Reding
2023-10-12 17:58 ` [PATCH v2 06/13] thermal: tegra: Do not register cooling device Thierry Reding
2023-10-13 15:57   ` Daniel Lezcano
2023-11-10 13:55     ` Thierry Reding
2023-11-10 14:52       ` Thierry Reding
2023-10-12 17:58 ` [PATCH v2 07/13] thermal: tegra: Use unsigned int where appropriate Thierry Reding
2023-10-12 17:58 ` [PATCH v2 08/13] thermal: tegra: Avoid over-allocation of temporary array Thierry Reding
2023-10-12 17:58 ` [PATCH v2 09/13] thermal: tegra: Remove gratuitous error assignment Thierry Reding
2023-10-12 17:58 ` [PATCH v2 10/13] thermal: tegra: Minor stylistic cleanups Thierry Reding
2023-10-12 17:58 ` [PATCH v2 11/13] arm64: tegra: Rework SOCTHERM on Tegra132 and Tegra210 Thierry Reding
2023-10-12 17:58 ` [PATCH v2 11/13] ARM: tegra: Rework SOCTHERM on Tegra124 Thierry Reding
2023-10-12 17:58 ` [PATCH v2 12/13] arm64: tegra: Rework SOCTHERM on Tegra132 and Tegra210 Thierry Reding
2023-10-12 17:58 ` [PATCH v2 12/13] ARM: tegra: Rework SOCTHERM on Tegra124 Thierry Reding
2023-10-12 17:58 ` [PATCH v2 13/13] thermal: Enforce self-encapsulation Thierry Reding
2023-10-13  9:14 ` [PATCH v2 00/13] thermal: tegra: Do not register cooling device Nicolas Chauvet
2023-10-13 11:43   ` Thierry Reding
2023-10-13 12:45     ` Nicolas Chauvet
2023-10-13 13:13       ` Thierry Reding
2023-10-13 13:55         ` Nicolas Chauvet
2023-10-13 15:45           ` Thierry Reding

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