This RFC series aims to add cpu based scaling support to the passive governor and scale DDR with a generic interconnect bandwidth based devfreq driver on SDM845 SoC. This series achieves similar functionality to Georgi's Patch series (https://patchwork.kernel.org/cover/10850817/) and can be used with MSM8916/MSM8996/QCS404 SoCs. [patches 1,6 - Add and export export helpers to get avg/peak bandwidth and update voltage of an disabled opp respectively] [patch 3 - Adds cpu based scaling support to passive governor] To achieve this, it listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor depends one of the following: * Constructs a CPU frequency to device frequency mapping table from required-opps property of the devfreq device's opp_table * Scales the device frequency in proportion to the CPU frequency by performing interpolation. [patch 7 - Parses and updates opps from the frequency/voltage read from the look up tables] The patch series depends on opp-bw-MBs bindings introduced in: https://patchwork.kernel.org/cover/10850817/ Saravana Kannan (2): PM / devfreq: Add cpu based scaling support to passive_governor PM / devfreq: Add devfreq driver for interconnect bandwidth voting Sibi Sankar (7): OPP: Add and export helpers to get avg/peak bw OPP: Export a number of helpers to prevent code duplication dt-bindings: devfreq: Add bindings for devfreq dev-icbw driver OPP: Add and export helper to update voltage cpufreq: qcom: Add support to update cpu node's OPP tables arm64: dts: qcom: sdm845: Add cpu OPP tables arm64: dts: qcom: sdm845: Add nodes for icbw driver and opp tables .../devicetree/bindings/devfreq/icbw.txt | 146 +++++++++ arch/arm64/boot/dts/qcom/sdm845.dtsi | 262 +++++++++++++++++ drivers/cpufreq/qcom-cpufreq-hw.c | 29 +- drivers/devfreq/Kconfig | 19 ++ drivers/devfreq/Makefile | 1 + drivers/devfreq/devfreq_icbw.c | 132 +++++++++ drivers/devfreq/governor_passive.c | 276 +++++++++++++++++- drivers/opp/core.c | 100 +++++++ drivers/opp/of.c | 13 +- include/linux/devfreq.h | 43 ++- include/linux/pm_opp.h | 35 +++ 11 files changed, 1044 insertions(+), 12 deletions(-) create mode 100644 Documentation/devicetree/bindings/devfreq/icbw.txt create mode 100644 drivers/devfreq/devfreq_icbw.c -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
