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[v2,0/7] clk: qcom: msm8996: add support for the CBF clock

Message ID 20230117225824.1552604-1-dmitry.baryshkov@linaro.org
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Series clk: qcom: msm8996: add support for the CBF clock | expand

Message

Dmitry Baryshkov Jan. 17, 2023, 10:58 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]

[1] https://lore.kernel.org/linux-arm-msm/20230111191453.2509468-1-dmitry.baryshkov@linaro.org/

- Relicensed schema to GPL-2.0 + BSD-2-Clause (Krzysztof)
- Changed clock driver to use parent_hws (Konrad)
- Fixed indentation in CBF clock driver (Konrad)
- Changed MODULE_LICENSE of CBF clock driver to GPL from GPL-v2
- Switched CBF to use RPM_SMD_XO_CLK_SRC as one of the parents
- Enabled RPM_SMD_XO_CLK_SRC on msm8996 platform and switch to it from
  RPM_SMD_BB_CLK1 clock

Dmitry Baryshkov (7):
  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
  clk: qcom: smd-rpm: provide RPM_SMD_XO_CLK_SRC on MSM8996 platform
  arm64: qcom: dts: msm8996 switch from RPM_SMD_BB_CLK1 to
    RPM_SMD_XO_CLK_SRC
  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         |  71 ++-
 drivers/clk/qcom/Makefile                     |   2 +-
 drivers/clk/qcom/clk-cbf-8996.c               | 456 ++++++++++++++++++
 drivers/clk/qcom/clk-smd-rpm.c                |   2 +
 5 files changed, 576 insertions(+), 8 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/clock/qcom,msm8996-cbf.yaml
 create mode 100644 drivers/clk/qcom/clk-cbf-8996.c