Hello, This series adds clock provider support to the Qcom CPUFreq driver for supplying the clocks to the CPU cores in Qcom SoCs. The Qualcomm platforms making use of CPUFreq HW Engine (EPSS/OSM) supply clocks to the CPU cores. But this is not represented clearly in devicetree. There is no clock coming out of the CPUFreq HW node to the CPU. This created an issue [1] with the OPP core when a recent enhancement series was submitted. Eventhough the issue got fixed in the OPP framework in the meantime, that's not a proper solution and this series aims to fix it properly. There was also an attempt made by Viresh [2] to fix the issue by moving the clocks supplied to the CPUFreq HW node to the CPU. But that was not accepted since those clocks belong to the CPUFreq HW node only. The proposal here is to add clock provider support to the Qcom CPUFreq HW driver to supply clocks to the CPUs that comes out of the EPSS/OSM block. This correctly reflects the hardware implementation. The clock provider is a simple one that just provides the frequency of the clocks supplied to each frequency domain in the SoC using .recalc_rate() callback. The frequency supplied by the driver will be the actual frequency that comes out of the EPSS/OSM block after the DCVS operation. This frequency is not same as what the CPUFreq framework has set but it is the one that gets supplied to the CPUs after throttling by LMh. This series has been tested on SM8450 based dev board and hence there is a DTS change only for that platform. Once this series gets accepted, rest of the platform DTS can also be modified and finally the hack on the OPP core can be dropped. Thanks, Mani [1] https://lore.kernel.org/lkml/YsxSkswzsqgMOc0l@xxxxxxxxxxxxxxxxxxxx/ [2] https://lore.kernel.org/lkml/20220801054255.GA12039@thinkpad/t/ Manivannan Sadhasivam (4): cpufreq: qcom-hw: Remove un-necessary cpumask_empty() check dt-bindings: cpufreq: cpufreq-qcom-hw: Add cpufreq clock provider cpufreq: qcom-hw: Add CPU clock provider support arm64: dts: qcom: sm8450: Supply clock from cpufreq node to CPUs .../bindings/cpufreq/cpufreq-qcom-hw.yaml | 12 ++++ arch/arm64/boot/dts/qcom/sm8450.dtsi | 9 +++ drivers/cpufreq/qcom-cpufreq-hw.c | 72 ++++++++++++++++--- 3 files changed, 84 insertions(+), 9 deletions(-) -- 2.25.1
