On 29/12/2020 07:17, Hector Yuan wrote: > The CPUfreq HW present in some Mediatek chipsets offloads the steps necessary for changing the frequency of CPUs. > The driver implements the cpufreq driver interface for this hardware engine. > This patch depends on MT6779 DTS patchset[1] submitted by Hanks Chen. This dependency got resolved, the patch is mainline since v5.11. Please delete it in further revisions of the patch set to minimize confusion. Thanks! > > From v8 to v9, there are three more modifications. > 1. Based on patchset[2], align binding with scmi for performance domain. > 2. Add the CPUFREQ fast switch function support and define DVFS latency. > 3. Based on patchser[3], add energy model API parameter for mW. > > From v7 to v8, there are three more patches based on patchset v8[4]. > This patchset is about to register power table to Energy model for EAS and thermal usage. > 1. EM CPU power table > - Register energy model table for EAS and thermal cooling device usage. > - Read the coresponding LUT for power table. > 2. SVS initialization > - The SVS(Smart Voltage Scaling) engine is a hardware which is > used to calculate optimized voltage values for CPU power domain. > DVFS driver could apply those optimized voltage values to reduce power consumption. > - Driver will polling if HW engine is done for SVS initialization. > After that, driver will read power table and register it to EAS. > - CPUs must be in power on state when doing SVS. Use pm_qos to block cpu-idle state for SVS initializing. > 3. Cooling device flag > - Add cooling device flag for thermal > > [1] https://lkml.org/lkml/2020/8/4/1094 > [2] https://lore.kernel.org/lkml/20201116181356.804590-1-sudeep.holla@xxxxxxx/ > [3] https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git/commit/?h=linux-next&id=c250d50fe2ce627ca9805d9c8ac11cbbf922a4a6 > [4] https://lkml.org/lkml/2020/9/23/384 > > > Hector.Yuan (2): > cpufreq: mediatek-hw: Add support for CPUFREQ HW > dt-bindings: cpufreq: add bindings for MediaTek cpufreq HW > > .../bindings/cpufreq/cpufreq-mediatek-hw.yaml | 116 ++++++ > drivers/cpufreq/Kconfig.arm | 12 + > drivers/cpufreq/Makefile | 1 + > drivers/cpufreq/mediatek-cpufreq-hw.c | 370 ++++++++++++++++++++ > 4 files changed, 499 insertions(+) > create mode 100644 Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek-hw.yaml > create mode 100644 drivers/cpufreq/mediatek-cpufreq-hw.c >
