Hi Dmitry, On Thu, 19 Jan 2023 at 23:14, Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> wrote: > > 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@xxxxxxxxxx/ > > Changes since v2: > - Added interconnect-related bindings > - Switched CPU and CBF clocks to RPM_SMD_XO_A_CLK_SRC > > Changes since v1: > - 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 (8): > dt-bindings: clock: qcom,msm8996-cbf: Describe the MSM8996 CBF clock > controller > dt-bindints: interconnect/msm8996-cbf: add defines to be used by CBF > 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 | 72 ++- > drivers/clk/qcom/Makefile | 2 +- > drivers/clk/qcom/clk-cbf-8996.c | 458 ++++++++++++++++++ > drivers/clk/qcom/clk-smd-rpm.c | 2 + > .../interconnect/qcom,msm8996-cbf.h | 12 + > 6 files changed, 591 insertions(+), 8 deletions(-) > create mode 100644 Documentation/devicetree/bindings/clock/qcom,msm8996-cbf.yaml > create mode 100644 drivers/clk/qcom/clk-cbf-8996.c > create mode 100644 include/dt-bindings/interconnect/qcom,msm8996-cbf.h > > -- > 2.39.0 > Could you please tell me which dev board this is targeting and where I can get one? Also could you please point me to the SoC documentation? Thanks, Simon
