On 20/01/2023 17:08, Simon Glass wrote:
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?
This is targeting db820c, which is available from arrow.com. Note, this
patchset is related only msm8996 aka Snapdragon 820, it has limited
applicability to msm8996-pro and is of no concern to most of other chipsets.
Also could you please point me to the SoC documentation?
https://developer.qualcomm.com/hardware/apq-8096sg/tools
Thanks,
Simon
--
With best wishes
Dmitry
