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[0/5] clk: qcom: msm8996: add support for the CBF clock

Message ID 20230111195754.2593134-1-dmitry.baryshkov@linaro.org
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Series clk: qcom: msm8996: add support for the CBF clock | expand

Message

Dmitry Baryshkov Jan. 11, 2023, 7:57 p.m. UTC 
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@linaro.org/
[2] https://lore.kernel.org/linux-arm-msm/20230111191634.2509616-1-dmitry.baryshkov@linaro.org/

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