From: Leonard Crestez <leonard.crestez@nxp•com>
To: Stephen Boyd <sboyd@kernel•org>, Shawn Guo <shawnguo@kernel•org>,
MyungJoo Ham <myungjoo.ham@samsung•com>,
Chanwoo Choi <cw00.choi@samsung•com>,
Rob Herring <robh+dt@kernel•org>
Cc: "Mark Rutland" <mark.rutland@arm•com>,
"Artur Świgoń" <a.swigon@partner•samsung.com>,
"Abel Vesa" <abel.vesa@nxp•com>,
"Saravana Kannan" <saravanak@google•com>,
"Anson Huang" <Anson.Huang@nxp•com>,
linux-arm-kernel@lists•infradead.org,
"Viresh Kumar" <viresh.kumar@linaro•org>,
"Michael Turquette" <mturquette@baylibre•com>,
linux-pm@vger•kernel.org, linux-imx@nxp•com,
"Krzysztof Kozlowski" <krzk@kernel•org>,
linux-clk@vger•kernel.org,
"Kyungmin Park" <kyungmin.park@samsung•com>,
"Alexandre Bailon" <abailon@baylibre•com>,
kernel@pengutronix•de, "Dong Aisheng" <aisheng.dong@nxp•com>,
"Fabio Estevam" <fabio.estevam@nxp•com>,
"Georgi Djakov" <georgi.djakov@linaro•org>,
devicetree@vger•kernel.org, "Jacky Bai" <ping.bai@nxp•com>
Subject: [PATCH v2 0/7] PM / devfreq: Add initial imx support
Date: Tue, 20 Aug 2019 18:45:05 +0300 [thread overview]
Message-ID: <cover.1566315740.git.leonard.crestez@nxp.com> (raw)
This adds devfreq support for imx8mm, covering dynamic scaling of
internal NOC and DDR Controller
Scaling for simple busses (NIC/NOC) is done through the clk framework
while DRAM scaling is performed in firmware with an "imx-ddrc" wrapper
for devfreq.
Changes since v1:
* bindings: Stop using "contains" for "compatible"
* bindings: Set "additionalProperties: false" and document missing stuff.
* Remove (c) from NXP copyright notice
* Fix various checkpatch issues
* Remove unused dram_alt_root clk from imx-ddrc
Link to v1: https://patchwork.kernel.org/project/linux-arm-kernel/list/?series=158773
Changes since RFC v3:
* Implement passive support and set NOC's parent to DDRC
* Drop scaling AHB/AXI for now (NOC/DDRC use most power anyway)
* Stop relying on clk_min_rate
* Split into two devreq drivers (and bindings) because the ddrc is
really a distinct piece of hardware.
* Perform DRAM frequency inside devfreq instead of clk, mostly due to
objections to earlier RFCs for imx8m-dram-clk.
* Fetch info about dram clk parents from firmware instead of
hardcoding in driver. This can more easily support additional rates.
* Link: https://patchwork.kernel.org/cover/11056779/
* Link: https://patchwork.kernel.org/patch/11049429/
Scaling buses can cause problems for devices with realtime bandwith
requirements such as display, the intention is to use the interconnect
framework to make DEV_PM_QOS_MIN_FREQUENCY to devfreq. There are
separate patches for that:
* https://patchwork.kernel.org/cover/11104055/
* https://patchwork.kernel.org/cover/11078671/
Leonard Crestez (7):
clk: imx8m: Set CLK_GET_RATE_NOCACHE on dram_alt/apb
dt-bindings: devfreq: Add bindings for generic imx buses
PM / devfreq: Add generic imx bus driver
dt-bindings: devfreq: Add bindings for imx ddr controller
PM / devfreq: Add dynamic scaling for imx ddr controller
PM / devfreq: imx-ddrc: Measure bandwidth with perf
arm64: dts: imx8mm: Add devfreq nodes
.../devicetree/bindings/devfreq/imx-ddrc.yaml | 60 ++
.../devicetree/bindings/devfreq/imx.yaml | 68 +++
arch/arm64/boot/dts/freescale/imx8mm.dtsi | 53 +-
drivers/clk/imx/clk-imx8mm.c | 6 +-
drivers/clk/imx/clk-imx8mn.c | 6 +-
drivers/clk/imx/clk-imx8mq.c | 7 +-
drivers/devfreq/Kconfig | 12 +
drivers/devfreq/Makefile | 1 +
drivers/devfreq/imx-ddrc.c | 514 ++++++++++++++++++
drivers/devfreq/imx-devfreq.c | 148 +++++
10 files changed, 867 insertions(+), 8 deletions(-)
create mode 100644 Documentation/devicetree/bindings/devfreq/imx-ddrc.yaml
create mode 100644 Documentation/devicetree/bindings/devfreq/imx.yaml
create mode 100644 drivers/devfreq/imx-ddrc.c
create mode 100644 drivers/devfreq/imx-devfreq.c
--
2.17.1
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next reply other threads:[~2019-08-20 15:45 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-20 15:45 Leonard Crestez [this message]
2019-08-20 15:45 ` [PATCH v2 1/7] clk: imx8m: Set CLK_GET_RATE_NOCACHE on dram_alt/apb Leonard Crestez
2019-09-16 20:33 ` Stephen Boyd
2019-09-16 23:03 ` Leonard Crestez
2019-09-17 16:32 ` Stephen Boyd
2019-09-17 16:59 ` Leonard Crestez
2019-08-20 15:45 ` [PATCH v2 2/7] dt-bindings: devfreq: Add bindings for generic imx buses Leonard Crestez
2019-08-20 15:45 ` [PATCH v2 3/7] PM / devfreq: Add generic imx bus driver Leonard Crestez
2019-08-20 15:45 ` [PATCH v2 4/7] dt-bindings: devfreq: Add bindings for imx ddr controller Leonard Crestez
2019-08-20 15:45 ` [PATCH v2 5/7] PM / devfreq: Add dynamic scaling " Leonard Crestez
2019-08-20 15:45 ` [PATCH v2 6/7] PM / devfreq: imx-ddrc: Measure bandwidth with perf Leonard Crestez
2019-08-20 15:45 ` [PATCH v2 7/7] arm64: dts: imx8mm: Add devfreq nodes Leonard Crestez
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