Re: [PATCH v3 0/8] clk: qcom: msm8996: add support for the CBF clock

[Simon Glass <sjg@chromium.org>]

Hi Dmitry,

On Thu, 19 Jan 2023 at 23:14, Dmitry Baryshkov
<dmitry.baryshkov@linaro.org> 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@linaro.org/
>
> 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