From: Leonard Crestez <leonard.crestez@nxp.com>
To: MyungJoo Ham <myungjoo.ham@samsung.com>,
Kyungmin Park <kyungmin.park@samsung.com>,
Will Deacon <will@kernel.org>, Stephen Boyd <sboyd@kernel.org>
Cc: Michael Turquette <mturquette@baylibre.com>,
Jacky Bai <ping.bai@nxp.com>, Anson Huang <Anson.Huang@nxp.com>,
Abel Vesa <abel.vesa@nxp.com>,
Dong Aisheng <aisheng.dong@nxp.com>,
Viresh Kumar <viresh.kumar@linaro.org>,
Georgi Djakov <georgi.djakov@linaro.org>,
Alexandre Bailon <abailon@baylibre.com>,
Chanwoo Choi <cw00.choi@samsung.com>,
Mark Rutland <mark.rutland@arm.com>, Frank Li <Frank.li@nxp.com>,
Rob Herring <robh+dt@kernel.org>, Shawn Guo <shawnguo@kernel.org>,
Sascha Hauer <s.hauer@pengutronix.de>,
Pengutronix Kernel Team <kernel@pengutronix.de>,
Fabio Estevam <festevam@gmail.com>,
NXP Linux Team <linux-imx@nxp.com>,
linux-pm@vger.kernel.org, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [RFCv2 0/3] PM / devfreq: Add imx driver
Date: Wed, 24 Jul 2019 15:38:43 +0300 [thread overview]
Message-ID: <cover.1563971855.git.leonard.crestez@nxp.com> (raw)
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
next reply other threads:[~2019-07-24 12:38 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-24 12:38 Leonard Crestez [this message]
2019-07-24 12:38 ` [RFCv3 1/3] dt-bindings: devfreq: Add initial bindings for i.MX Leonard Crestez
2019-07-25 14:23 ` Chanwoo Choi
2019-07-24 12:38 ` [RFCv3 2/3] PM / devfreq: Add imx driver Leonard Crestez
2019-07-24 12:38 ` [RFCv3 3/3] PM / devfreq: Add imx perf event support Leonard Crestez
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