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[109.252.193.91]) by smtp.gmail.com with ESMTPSA id z23sm2360662lfq.241.2021.05.10.13.28.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 May 2021 13:28:07 -0700 (PDT) From: Dmitry Osipenko To: Thierry Reding , Jonathan Hunter , Agneli , Paul Fertser , Svyatoslav Ryhel Cc: linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v1 06/10] ARM: tegra: paz00: Add CPU thermal zone Date: Mon, 10 May 2021 23:25:56 +0300 Message-Id: <20210510202600.12156-7-digetx@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210510202600.12156-1-digetx@gmail.com> References: <20210510202600.12156-1-digetx@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add thermal zone with a passive cooling trip for CPU. Attach it to the LM90 sensor which monitors CPU temperature. Now CPU frequencies will be throttled once trip point is reached, preventing critical overheat. Tested-by: Agneli Tested-by: Paul Fertser Signed-off-by: Dmitry Osipenko --- arch/arm/boot/dts/tegra20-paz00.dts | 42 +++++++++++++++++++++++++++-- 1 file changed, 40 insertions(+), 2 deletions(-) diff --git a/arch/arm/boot/dts/tegra20-paz00.dts b/arch/arm/boot/dts/tegra20-paz00.dts index 63d62418d4b8..3180bff90756 100644 --- a/arch/arm/boot/dts/tegra20-paz00.dts +++ b/arch/arm/boot/dts/tegra20-paz00.dts @@ -2,6 +2,8 @@ /dts-v1/; #include +#include + #include "tegra20.dtsi" #include "tegra20-cpu-opp.dtsi" #include "tegra20-cpu-opp-microvolt.dtsi" @@ -498,9 +500,10 @@ ldo_rtc { }; }; - adt7461@4c { + adt7461: temperature-sensor@4c { compatible = "adi,adt7461"; reg = <0x4c>; + #thermal-sensor-cells = <1>; }; }; @@ -655,11 +658,46 @@ cpus { cpu0: cpu@0 { cpu-supply = <&cpu_vdd_reg>; operating-points-v2 = <&cpu0_opp_table>; + #cooling-cells = <2>; }; - cpu@1 { + cpu1: cpu@1 { cpu-supply = <&cpu_vdd_reg>; operating-points-v2 = <&cpu0_opp_table>; + #cooling-cells = <2>; + }; + }; + + thermal-zones { + cpu-thermal { + polling-delay-passive = <500>; /* milliseconds */ + polling-delay = <1500>; /* milliseconds */ + + thermal-sensors = <&adt7461 1>; + + trips { + trip0: cpu-alert0 { + /* start throttling at 80C */ + temperature = <80000>; + hysteresis = <200>; + type = "passive"; + }; + + trip1: cpu-crit { + /* shut down at 85C */ + temperature = <85000>; + hysteresis = <2000>; + type = "critical"; + }; + }; + + cooling-maps { + map0 { + trip = <&trip0>; + cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>, + <&cpu1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>; + }; + }; }; }; }; -- 2.30.2