linux-kernel - [RFCv2 0/3] PM / devfreq: Add imx driver

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Date:   Wed, 24 Jul 2019 15:38:43 +0300
From:   Leonard Crestez <leonard.crestez@....com>
To:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Will Deacon <will@...nel.org>, Stephen Boyd <sboyd@...nel.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Jacky Bai <ping.bai@....com>,
        Anson Huang <Anson.Huang@....com>,
        Abel Vesa <abel.vesa@....com>,
        Dong Aisheng <aisheng.dong@....com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Alexandre Bailon <abailon@...libre.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Mark Rutland <mark.rutland@....com>,
        Frank Li <Frank.li@....com>, Rob Herring <robh+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [RFCv2 0/3] PM / devfreq: Add imx driver

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