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[84.217.220.205]) by smtp.gmail.com with ESMTPSA id y18sm4107961lja.12.2019.11.15.04.17.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Nov 2019 04:17:37 -0800 (PST) From: Niklas Cassel To: linux-pm@vger.kernel.org, linux-arm-msm@vger.kernel.org Cc: amit.kucheria@linaro.org, sboyd@kernel.org, vireshk@kernel.org, bjorn.andersson@linaro.org, ulf.hansson@linaro.org, Niklas Cassel , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v5 0/5] Add support for QCOM Core Power Reduction Date: Fri, 15 Nov 2019 13:15:37 +0100 Message-Id: <20191115121544.2339036-1-niklas.cassel@linaro.org> X-Mailer: git-send-email 2.23.0 MIME-Version: 1.0 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org This series adds support for Core Power Reduction (CPR), a form of Adaptive Voltage Scaling (AVS), found on certain Qualcomm SoCs. This series is based on top of the qcs404 cpufreq patch series that hasn't landed yet: https://patchwork.kernel.org/project/linux-arm-msm/list/?series=173423 as well as that series' matching device tree changes: https://patchwork.kernel.org/project/linux-arm-msm/list/?series=165457 CPR is a technology that reduces core power on a CPU or on other device. It reads voltage settings from efuses (that have been written in production), it uses these voltage settings as initial values, for each OPP. After moving to a certain OPP, CPR monitors dynamic factors such as temperature, etc. and adjusts the voltage for that frequency accordingly to save power and meet silicon characteristic requirements. This driver has been developed together with Jorge Ramirez-Ortiz, and is based on an RFC by Stephen Boyd[1], which in turn is based on work by others on codeaurora.org[2]. [1] https://lkml.org/lkml/2015/9/18/833 [2] https://www.codeaurora.org/cgit/quic/la/kernel/msm-3.10/tree/drivers/regulator/cpr-regulator.c?h=msm-3.10 Changes since V4: Implemented review comments from Stephen Boyd. Removed suspend()/resume(), since they did the same things as ->power_on()/ ->power_off() genpd callbacks. Niklas Cassel (5): dt-bindings: power: avs: Add support for CPR (Core Power Reduction) power: avs: Add support for CPR (Core Power Reduction) arm64: dts: qcom: qcs404: Add CPR and populate OPP table arm64: defconfig: enable CONFIG_QCOM_CPR arm64: defconfig: enable CONFIG_ARM_QCOM_CPUFREQ_NVMEM .../bindings/power/avs/qcom,cpr.txt | 130 ++ MAINTAINERS | 8 + arch/arm64/boot/dts/qcom/qcs404.dtsi | 132 +- arch/arm64/configs/defconfig | 2 + drivers/power/avs/Kconfig | 15 + drivers/power/avs/Makefile | 1 + drivers/power/avs/qcom-cpr.c | 1755 +++++++++++++++++ 7 files changed, 2035 insertions(+), 8 deletions(-) create mode 100644 Documentation/devicetree/bindings/power/avs/qcom,cpr.txt create mode 100644 drivers/power/avs/qcom-cpr.c -- 2.23.0