On MSM8996 two CPU clusters are interconnected using the Core Bus Fabric (CBF). In order for the CPU clusters to function properly, it should be clocked following the core's frequencies to provide adequate bandwidth. On the other hand the CBF's clock rate can be used by other drivers (e.g. by the pending SPDM driver to provide input on the CPU performance). Thus register CBF as a clock (required for CPU to boot) and add a tiny interconnect layer on top of it to let cpufreq/opp scale the CBF clock. Dependencies: [1], [2] [1] https://lore.kernel.org/linux-arm-msm/20230111191453.2509468-1-dmitry.baryshkov@xxxxxxxxxx/ [2] https://lore.kernel.org/linux-arm-msm/20230111191634.2509616-1-dmitry.baryshkov@xxxxxxxxxx/ Dmitry Baryshkov (5): dt-bindings: clock: qcom,msm8996-cbf: Describe the MSM8996 CBF clock controller clk: qcom: add msm8996 Core Bus Framework (CBF) support clk: qcom: cbf-msm8996: scale CBF clock according to the CPUfreq arm64: dts: qcom: msm8996: add CBF device entry arm64: dts: qcom: msm8996: scale CBF clock according to the CPUfreq .../bindings/clock/qcom,msm8996-cbf.yaml | 53 ++ arch/arm64/boot/dts/qcom/msm8996.dtsi | 57 +++ drivers/clk/qcom/Makefile | 2 +- drivers/clk/qcom/clk-cbf-8996.c | 457 ++++++++++++++++++ 4 files changed, 568 insertions(+), 1 deletion(-) create mode 100644 Documentation/devicetree/bindings/clock/qcom,msm8996-cbf.yaml create mode 100644 drivers/clk/qcom/clk-cbf-8996.c -- 2.30.2
