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From: Matthias Kaehlcke <mka@chromium.org>
To: Andy Gross <andy.gross@linaro.org>,
	David Brown <david.brown@linaro.org>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Zhang Rui <rui.zhang@intel.com>,
	Eduardo Valentin <edubezval@gmail.com>
Cc: linux-soc@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
	linux-pm@vger.kernel.org, David Collins <collinsd@codeaurora.org>,
	Douglas Anderson <dianders@chromium.org>,
	Stephen Boyd <sboyd@kernel.org>,
	Matthias Kaehlcke <mka@chromium.org>
Subject: [PATCH v6 2/5] dt-bindings: thermal: qcom-spmi-temp-alarm: Improve thermal zone in example
Date: Tue, 31 Jul 2018 11:59:14 -0700
Message-ID: <20180731185917.176074-2-mka@chromium.org> (raw)
In-Reply-To: <20180731185917.176074-1-mka@chromium.org>

The current example for a thermal zone isn't very useful as reference
since it would result in a hardware shutdown at 145°C, instead of
allowing the system to try to shutdown gracefully. Without an ADC
channel a maximum of two trip points is useful in practice for this
sensor, with temperatures corresponding to the stage 1 and stage 2
'hardware trip points'. A critical trip point at stage 2 may allow the
system to shutdown before a hardware shutdown at stage 3 kicks in. It
should be noted though that by default the chip performs a 'partial
shutdown' when the temperature reaches stage 2, which may prevent an
orderly shutdown. The 'partial shutdown' can be disabled by software.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
---
Changes in v6:
- patch added to the series
---
 .../bindings/thermal/qcom-spmi-temp-alarm.txt         | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/Documentation/devicetree/bindings/thermal/qcom-spmi-temp-alarm.txt b/Documentation/devicetree/bindings/thermal/qcom-spmi-temp-alarm.txt
index 86fb41fe772f..0273a92a2a84 100644
--- a/Documentation/devicetree/bindings/thermal/qcom-spmi-temp-alarm.txt
+++ b/Documentation/devicetree/bindings/thermal/qcom-spmi-temp-alarm.txt
@@ -35,19 +35,14 @@ Example:
 			thermal-sensors = <&pm8941_temp>;
 
 			trips {
-				passive {
-					temperature = <1050000>;
+				stage1 {
+					temperature = <105000>;
 					hysteresis = <2000>;
 					type = "passive";
 				};
-				alert {
+				stage2 {
 					temperature = <125000>;
 					hysteresis = <2000>;
-					type = "hot";
-				};
-				crit {
-					temperature = <145000>;
-					hysteresis = <2000>;
 					type = "critical";
 				};
 			};
-- 
2.18.0.345.g5c9ce644c3-goog


  reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-31 18:59 [PATCH v6 1/5] dt-bindings: thermal: qcom-spmi-temp-alarm: Fix documentation of 'reg' Matthias Kaehlcke
2018-07-31 18:59 ` Matthias Kaehlcke [this message]
2018-07-31 19:20   ` [PATCH v6 2/5] dt-bindings: thermal: qcom-spmi-temp-alarm: Improve thermal zone in example Rob Herring
2018-07-31 18:59 ` [PATCH v6 3/5] thermal: qcom-spmi: Use PMIC thermal stage 2 for critical trip points Matthias Kaehlcke
2018-08-09 21:28   ` Doug Anderson
2018-07-31 18:59 ` [PATCH v6 4/5] arm64: dts: qcom: pm8998: Add spmi-temp-alarm node Matthias Kaehlcke
2018-07-31 18:59 ` [PATCH v6 5/5] arm64: dts: qcom: pm8998: Add pm8998 thermal zone Matthias Kaehlcke
2018-07-31 19:18 ` [PATCH v6 1/5] dt-bindings: thermal: qcom-spmi-temp-alarm: Fix documentation of 'reg' Rob Herring
2018-08-24 23:11 ` Eduardo Valentin
  -- strict thread matches above, loose matches on Subject: below --
2018-07-31 18:45 Matthias Kaehlcke
2018-07-31 18:45 ` [PATCH v6 2/5] dt-bindings: thermal: qcom-spmi-temp-alarm: Improve thermal zone in example Matthias Kaehlcke

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