From: Chanwoo Choi <cw00.choi@samsung.com>
To: myungjoo.ham@samsung.com, k.kozlowski@samsung.com, kgene@kernel.org
Cc: kyungmin.park@samsung.com, robh+dt@kernel.org,
pawel.moll@arm.com, mark.rutland@arm.com,
ijc+devicetree@hellion.org.uk, galak@codeaurora.org,
linux@arm.linux.org.uk, tjakobi@math.uni-bielefeld.de,
linux.amoon@gmail.com, cw00.choi@samsung.com,
linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
linux-samsung-soc@vger.kernel.org, devicetree@vger.kernel.org
Subject: [PATCH v3 00/20] PM / devferq: Add generic exynos bus frequency driver and new passive governor
Date: Fri, 11 Dec 2015 14:07:39 +0900 [thread overview]
Message-ID: <1449810479-14763-1-git-send-email-cw00.choi@samsung.com> (raw)
This patch-set includes the two features as following. The generic exynos bus
frequency driver is able to support almost Exynos SoCs for bus frequency
scaling. And the new passive governor is able to make the dependency on
between devices for frequency/voltage scaling. I had posted the patch-set[2]
with the similiar concept. This is is revised version for exynos bus frequency.
- Generic exynos bus frequency driver
- New passive governor of DEVFREQ framework
Depend on:
- next-20151210 tag of linux-next (master branch).
- Merge the latest devfreq patches on devfreq.git[2] (for-rafael branch).
[1] https://git.kernel.org/cgit/linux/kernel/git/mzx/devfreq.git/ (branch: for-rafael)
[2] https://lkml.org/lkml/2015/1/7/872
: [PATCHv3 0/8] devfreq: Add generic exynos memory-bus frequency driver
Changes from v2:
(https://lkml.org/lkml/2015/12/8/869)
- Fix typo on documentation
- Modify the more appropriate sentence on patch description
- Add the detailed description about both parent and passive bus device
- Modify the DMC frequency for Exynos4x12 DMC bus (200MHz -> 267MHz)
- Modify the voltage of 200MHz was included in Exynos3250 DMC bus (800mV -> 825mV)
- Rename OPP nodes as 'opp@<opp-hz>'
- Delete the duplicate 'opp-microvolt' property of passive devfreq device
- Reorder the 'bus_xxx' device tree node alphabetically in exynos3250-rinato/monk.dts
- Reorder the 'bus_xxx' device tree node alphabetically in exynos4412-trats/odroidu3
- Add new exynos4412-ppmu-common.dtsi to remove the duplicate PPMU dt node
on rinato/monk/trats2/odroid-u3 board
- Add the log message if bus device is registered to devfreq framework successfully
- Add the reviewed-by tag from Krzysztof Kozlowski
- Add the tested-by tag from Anand Moon on Odroid U3
- Add 'SAMSUNG BUS FREQUENCY DRIVER' entry to MAINTAINERS
Changes from v1:
(https://lkml.org/lkml/2015/11/26/260)
- Check whether the instance of regulator is NULL or not
when executing regulator_disable() because of only parent
devfreq device has the regulator instance. After fixing it,
the wake-up from suspend state is well working. (patch1)
- Fix bug which checks 'bus-clk' instead of 'bus->regulator'
after calling devm_clk_get() (on patch1)
- Update the documentation to remove the description about
DEVFREQ-EVENT subsystem (on patch2)
- Add the full name of DMC (Dynamic Memory Controller) (on patch2)
- Modify the detailed correlation of buses for Exynos3250
on documentation (patch2)
- Add the MFC bus node for Exynos3250 (on patch11, patch12)
- Fix the duplicate frequency of bus_display on Exynos4x12.dtsi
- Add the PPMU node for exynos4412-odroidu3
- Add the support of bus frequency for exynos4412-odroidu3
Detailed descirption for patch-set:
1. Add generic exynos bus frequency driver
: This patch-set adds the generic exynos bus frequency driver for AXI bus
of sub-blocks in exynos SoC. The Samsung Exynos SoC have the common
architecture for bus between DRAM and sub-blocks in SoC.
There are the different buses according to Exynos SoC because Exynos SoC
has the differnt sub-blocks and bus speed. In spite of this difference
among Exynos SoCs, this driver is able to support almost Exynos SoC by adding
unique data of each bus in the devicetree file.
In devicetree, each bus node has a bus clock, regulator, operation-point
and devfreq-event devices which measure the utilization of each bus block.
For example,
- The bus of DMC block in exynos3250.dtsi are listed below:
bus_dmc: bus_dmc {
compatible = "samsung,exynos-bus";
clocks = <&cmu_dmc CLK_DIV_DMC>;
clock-names = "bus";
operating-points-v2 = <&bus_dmc_opp_table>;
status = "disabled";
};
bus_dmc_opp_table: opp_table1 {
compatible = "operating-points-v2";
opp-shared;
opp@50000000 {
opp-hz = /bits/ 64 <50000000>;
opp-microvolt = <800000>;
};
opp@100000000 {
opp-hz = /bits/ 64 <100000000>;
opp-microvolt = <800000>;
};
opp@134000000 {
opp-hz = /bits/ 64 <134000000>;
opp-microvolt = <800000>;
};
opp@200000000 {
opp-hz = /bits/ 64 <200000000>;
opp-microvolt = <825000>;
};
opp@400000000 {
opp-hz = /bits/ 64 <400000000>;
opp-microvolt = <875000>;
};
};
- Usage case to handle the frequency and voltage of bus on runtime
in exynos3250-rinato.dts are listed below:
&bus_dmc {
devfreq-events = <&ppmu_dmc0_3>, <&ppmu_dmc1_3>;
vdd-supply = <&buck1_reg>; /* VDD_MIF */
status = "okay";
};
2. Add new passive governor of DEVFREQ framework (patch5-patch7)
: This patch-set add the new passive governor for DEVFREQ framework.
The existing governors (ondemand, performance and so on) are used for DVFS
(Dynamic Voltage and Frequency Scaling) drivers. The existing governors
are independently used for specific device driver which don't give the
influence to other device drviers and also don't receive the effect from
other device drivers.
The passive governor depends on operation of parent driver with existing
governors(ondemand, performance and so on) extremely and is not able to
decide the new frequency by oneself. According to the decided new frequency
of parent driver with governor, the passive governor uses it to decide
the appropriate frequency for own device driver. The passive governor
must need the following information from device tree:
For exameple,
There are one more bus device drivers in Exynos3250 which need to
change their source clock according to their utilization on runtime.
But, they share the same power line (e.g., regulator). So, LEFTBUS bus
driver is operated as parent with ondemand governor and then the rest
device driver with passive governor.
The buses of Internal block in exynos3250.dtsi are listed below:
When LEFTBUS bus driver (parent) changes the bus frequency with
ondemand governor on runtime, the rest bus devices which sharing
the same power line (VDD_INT) will change the each bus frequency
according to the decision of LEFTBUS bus driver (parent).
- INT (Internal) block
: VDD_INT |--- LEFTBUS
|--- PERIL
|--- MFC
|--- G3D
|--- RIGHTBUS
|--- FSYS
|--- LCD0
|--- PERIR
|--- ISP
|--- CAM
- The buss of INT block in exynos3250.dtsi are listed below:
bus_leftbus: bus_leftbus {
compatible = "samsung,exynos-bus";
clocks = <&cmu CLK_DIV_GDL>;
clock-names = "bus";
operating-points-v2 = <&bus_leftbus_opp_table>;
status = "disabled";
};
bus_rightbus: bus_rightbus {
compatible = "samsung,exynos-bus";
clocks = <&cmu CLK_DIV_GDR>;
clock-names = "bus";
operating-points-v2 = <&bus_leftbus_opp_table>;
status = "disabled";
};
(Omit the rest bus dt node)
- Usage case to handle the frequency and voltage of bus on runtime
in exynos3250-rinato.dts are listed below:
/* Parent bus device of VDD_INT */
&bus_leftbus {
devfreq-events = <&ppmu_leftbus_3>, <&ppmu_rightbus_3>;
vdd-supply = <&buck3_reg>;
status = "okay";
};
/* Passive bus device depend on LEFTBUS bus. */
&bus_rightbus {
devfreq = <&bus_leftbus>; /* 'devfreq' property indicates
the phandle of parent device. */
status = "okay";
};
(Omit the rest bus dt node)
Chanwoo Choi (20):
PM / devfreq: exynos: Add generic exynos bus frequency driver
PM / devfreq: exynos: Add documentation for generic exynos bus frequency driver
ARM: dts: Add DMC bus node for Exynos3250
ARM: dts: Add DMC bus frequency for exynos3250-rinato/monk
PM / devfreq: Add new passive governor
PM / devfreq: Add devfreq_get_devfreq_by_phandle()
PM / devfreq: Show the related information according to governor type
PM / devfreq: exynos: Add support of bus frequency of sub-blocks using passive governor
PM / devfreq: exynos: Update documentation for bus devices using passive governor
PM / devfreq: exynos: Add the detailed correlation between sub-blocks and power line
PM / devfreq: exynos: Remove unused exynos4/5 busfreq driver
MAINTAINERS: Add samsung bus frequency driver entry
ARM: dts: Add bus nodes using VDD_INT for Exynos3250
ARM: dts: Add bus nodes using VDD_MIF for Exynos4x12
ARM: dts: Add bus nodes using VDD_INT for Exynos4x12
ARM: dts: Add bus nodes using VDD_MIF for Exynos4210
ARM: dts: Add exynos4412-ppmu-common dtsi to delete duplicate PPMU node
ARM: dts: Add support of bus frequency using VDD_INT for exynos3250-rinato
ARM: dts: Expand the voltage range of buck1/3 regulator for exynos4412-odroidu3
ARM: dts: Add support of bus frequency for exynos4412-trats/odroidu3
.../devicetree/bindings/devfreq/exynos-bus.txt | 388 +++++++
MAINTAINERS | 9 +
arch/arm/boot/dts/exynos3250-monk.dts | 47 +-
arch/arm/boot/dts/exynos3250-rinato.dts | 88 +-
arch/arm/boot/dts/exynos3250.dtsi | 181 ++++
arch/arm/boot/dts/exynos4210.dtsi | 159 +++
arch/arm/boot/dts/exynos4412-odroid-common.dtsi | 54 +-
arch/arm/boot/dts/exynos4412-ppmu-common.dtsi | 49 +
arch/arm/boot/dts/exynos4412-trats2.dts | 89 +-
arch/arm/boot/dts/exynos4x12.dtsi | 174 ++++
drivers/devfreq/Kconfig | 37 +-
drivers/devfreq/Makefile | 2 +
drivers/devfreq/devfreq.c | 120 ++-
drivers/devfreq/exynos/Makefile | 3 +-
drivers/devfreq/exynos/exynos-bus.c | 556 +++++++++++
drivers/devfreq/exynos/exynos4_bus.c | 1055 --------------------
drivers/devfreq/exynos/exynos4_bus.h | 110 --
drivers/devfreq/exynos/exynos5_bus.c | 431 --------
drivers/devfreq/exynos/exynos_ppmu.c | 119 ---
drivers/devfreq/exynos/exynos_ppmu.h | 86 --
drivers/devfreq/governor.h | 7 +
drivers/devfreq/governor_passive.c | 109 ++
drivers/devfreq/governor_performance.c | 1 +
drivers/devfreq/governor_powersave.c | 1 +
drivers/devfreq/governor_simpleondemand.c | 1 +
drivers/devfreq/governor_userspace.c | 1 +
include/linux/devfreq.h | 26 +
27 files changed, 1955 insertions(+), 1948 deletions(-)
create mode 100644 Documentation/devicetree/bindings/devfreq/exynos-bus.txt
create mode 100644 arch/arm/boot/dts/exynos4412-ppmu-common.dtsi
create mode 100644 drivers/devfreq/exynos/exynos-bus.c
delete mode 100644 drivers/devfreq/exynos/exynos4_bus.c
delete mode 100644 drivers/devfreq/exynos/exynos4_bus.h
delete mode 100644 drivers/devfreq/exynos/exynos5_bus.c
delete mode 100644 drivers/devfreq/exynos/exynos_ppmu.c
delete mode 100644 drivers/devfreq/exynos/exynos_ppmu.h
create mode 100644 drivers/devfreq/governor_passive.c
--
1.9.1
next reply other threads:[~2015-12-11 5:28 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-11 5:07 Chanwoo Choi [this message]
2015-12-11 5:07 ` [PATCH v3 01/20] PM / devfreq: exynos: Add generic exynos bus frequency driver Chanwoo Choi
2015-12-11 7:52 ` Chanwoo Choi
2015-12-11 8:03 ` Krzysztof Kozlowski
2015-12-14 7:14 ` Chanwoo Choi
2015-12-11 5:07 ` [PATCH v3 02/20] PM / devfreq: exynos: Add documentation for " Chanwoo Choi
2015-12-11 6:35 ` Krzysztof Kozlowski
2015-12-11 5:07 ` [PATCH v3 03/20] ARM: dts: Add DMC bus node for Exynos3250 Chanwoo Choi
2015-12-11 6:36 ` Krzysztof Kozlowski
2015-12-11 5:07 ` [PATCH v3 04/20] ARM: dts: Add DMC bus frequency for exynos3250-rinato/monk Chanwoo Choi
2015-12-11 5:07 ` [PATCH v3 05/20] PM / devfreq: Add new passive governor Chanwoo Choi
2015-12-11 5:07 ` Chanwoo Choi
2015-12-11 5:07 ` [PATCH v3 06/20] PM / devfreq: Add devfreq_get_devfreq_by_phandle() Chanwoo Choi
2015-12-11 5:07 ` [PATCH v3 07/20] PM / devfreq: Show the related information according to governor type Chanwoo Choi
2015-12-11 5:07 ` [PATCH v3 08/20] PM / devfreq: exynos: Add support of bus frequency of sub-blocks using passive governor Chanwoo Choi
2015-12-11 5:07 ` [PATCH v3 09/20] PM / devfreq: exynos: Update documentation for bus devices " Chanwoo Choi
2015-12-11 5:07 ` Chanwoo Choi
2015-12-11 5:07 ` [PATCH v3 10/20] PM / devfreq: exynos: Add the detailed correlation between sub-blocks and power line Chanwoo Choi
2015-12-11 5:07 ` [PATCH v3 11/20] PM / devfreq: exynos: Remove unused exynos4/5 busfreq driver Chanwoo Choi
2015-12-11 5:07 ` [PATCH v3 12/20] MAINTAINERS: Add samsung bus frequency driver entry Chanwoo Choi
2015-12-11 5:07 ` [PATCH v3 13/20] ARM: dts: Add bus nodes using VDD_INT for Exynos3250 Chanwoo Choi
2015-12-11 6:55 ` Krzysztof Kozlowski
2015-12-11 5:07 ` [PATCH v3 14/20] ARM: dts: Add bus nodes using VDD_MIF for Exynos4x12 Chanwoo Choi
2015-12-11 7:01 ` Krzysztof Kozlowski
2015-12-11 5:07 ` [PATCH v3 15/20] ARM: dts: Add bus nodes using VDD_INT " Chanwoo Choi
2015-12-11 7:03 ` Krzysztof Kozlowski
2015-12-11 5:07 ` [PATCH v3 16/20] ARM: dts: Add bus nodes using VDD_MIF for Exynos4210 Chanwoo Choi
2015-12-11 7:04 ` Krzysztof Kozlowski
2015-12-11 5:07 ` [PATCH v3 17/20] ARM: dts: Add exynos4412-ppmu-common dtsi to delete duplicate PPMU node Chanwoo Choi
2015-12-11 7:15 ` Krzysztof Kozlowski
2015-12-11 7:15 ` Krzysztof Kozlowski
2015-12-11 7:25 ` Chanwoo Choi
2015-12-11 5:07 ` [PATCH v3 18/20] ARM: dts: Add support of bus frequency using VDD_INT for exynos3250-rinato Chanwoo Choi
2015-12-11 7:18 ` Krzysztof Kozlowski
2015-12-11 7:28 ` Chanwoo Choi
2015-12-11 5:07 ` [PATCH v3 19/20] ARM: dts: Expand the voltage range of buck1/3 regulator for exynos4412-odroidu3 Chanwoo Choi
2015-12-11 5:07 ` [PATCH v3 20/20] ARM: dts: Add support of bus frequency for exynos4412-trats/odroidu3 Chanwoo Choi
2015-12-11 7:20 ` Krzysztof Kozlowski
2015-12-11 8:35 ` Chanwoo Choi
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