This series attempts to add devfreq support for imx8mm, covering dynamic scaling of internal buses and dram. Actual scaling is performed through the clk framework: The NOC and main NICs are driven by composite clks and a new 'imx8m-dram' clk is used for scaling dram using firmware calls. Frequency target is set via "clk_set_min_rate", this allows an unrelated subsystem (for example interconnect) to also request minimum rates as a form for proactive scaling. The dram controller (DDRC) has a performance monitoring block attached for which a perf driver already exists. Instead of reimplementing that as devfreq-events the perf in-kernel API is used. Changes since v2: * Solve review comments * Add yaml binding doc * Add perf event support Link to v2: https://patchwork.kernel.org/patch/11021571/ DRAM frequency switching through clk framework is here: * https://patchwork.kernel.org/patch/11049429/ That part might not be accepted in clk and it might have to be moved to devfreq also. Leonard Crestez (3): dt-bindings: devfreq: Add initial bindings for i.MX PM / devfreq: Add imx driver PM / devfreq: Add imx perf event support .../devicetree/bindings/devfreq/imx.yaml | 59 ++++ drivers/devfreq/Kconfig | 10 + drivers/devfreq/Makefile | 1 + drivers/devfreq/imx-devfreq.c | 278 ++++++++++++++++++ 4 files changed, 348 insertions(+) create mode 100644 Documentation/devicetree/bindings/devfreq/imx.yaml create mode 100644 drivers/devfreq/imx-devfreq.c -- 2.17.1
