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Tue, 07 Jul 2026 12:22:31 -0700 (PDT) Received: from juillet.box.freepro.com ([2a05:6e02:1041:c10:8029:bbc1:63:ed84]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-493e0f3677asm70025515e9.4.2026.07.07.12.22.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Jul 2026 12:22:30 -0700 (PDT) From: Daniel Lezcano To: sre@kernel.org, hansg@kernel.org, ilpo.jarvinen@linux.intel.com, linux@roeck-us.net, andersson@kernel.org, konradybcio@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org Cc: bryan.odonoghue@linaro.org, platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, neil.armstrong@linaro.org, gaurav.kohli@oss.qualcomm.com, manaf.pallikunhi@oss.qualcomm.com, priyansh.jain@oss.qualcomm.com Subject: [PATCH v6 0/3] Lenovo ThinkPad T14s EC thermal monitoring and thermal zone integration Date: Tue, 7 Jul 2026 21:22:25 +0200 Message-ID: <20260707192228.14647-1-daniel.lezcano@oss.qualcomm.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: platform-driver-x86@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; 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The EC provides access to several platform temperature sensors covering the SoC, keyboard area, bottom cover, charging circuitry, QTM module and SSD. These sensors are currently used by the firmware for thermal management but are not exposed to Linux. The first patch adds hwmon support for the EC temperature sensors. The second patch exposes the EC as a thermal sensor provider in the device tree and defines thermal zones for the keyboard skin temperature and the charging circuitry temperature. This allows the generic thermal framework to react to EC-reported temperatures and apply standard Linux thermal mitigation policies. As the EC protocol is not fully decoded, the passive trip points get/set actions are missing, so it is not possible to program a threshold and receive an interrupt when crossed the way up or down. Consequently, the thermal zone related to the charging circuitry is polled every two seconds until we can set the trip points in the EC. This series fixes critical thermal issues happening on this platform where a kernel compilation, or heavy workloads, lead to a system reboot. Tested on a Lenovo ThinkPad T14s Gen 6 (Snapdragon X Elite). Please make sure scmi-cpufreq.ko is loaded before testing Thanks, Daniel --- Changelog: v6: - Added Reviewed-by tag (Dmitry Baryshkov) - Removed required property for #thermal-sensor-cells (Krzysztof Kozlowski) v5: - Added Reviewed-by tag (Ilpo Järvinen) - Added the '#thermal-sensor-cells' property DT binding (Sashiko) v4: - Added the missing HWMON_C_REGISTER_TZ attribute (Sashiko) - Fixed dependency with HWMON (Sashiko) - Added Tested-by tag (Neil Armstrong) v3: - Removed event based because trip point are not yet well supported - Added an empty line after variable declaration (Ilpo Järvinen) - Used MILLIDEGREE_PER_DEGREE from units.h (Ilpo Järvinen) - Made switch consistent (Ilpo Järvinen) v2: - Fixed patch 1 subject prefix - Removed the fan information part - Added HWMON_T_ALARM - Fixed DT change description to reflect what it does really Daniel Lezcano (3): dt-bindings: embedded-controller: Add Lenovo ThinkPad T14s thermal sensor provider support platform: arm64: lenovo-thinkpad-t14s-ec: Add hwmon support for temperatures arm64: dts: qcom: x1e78100-t14s: Add thermal zones for keyboard skin and charging sensors .../lenovo,thinkpad-t14s-ec.yaml | 4 + .../qcom/x1e78100-lenovo-thinkpad-t14s.dtsi | 67 ++++++++- drivers/platform/arm64/Kconfig | 1 + drivers/platform/arm64/lenovo-thinkpad-t14s.c | 131 ++++++++++++++++++ 4 files changed, 202 insertions(+), 1 deletion(-) -- 2.53.0