[PATCH v2 0/7] Add CPU Frequency scaling support on Armada 37xx

[Gregory CLEMENT <gregory.clement-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>]

Hi,

This is the second version of a series adding the CPU Frequency
support on Armada 37xx using DVFS. It is based on the initial work of
Evan Wang and Victor Gu.

The main change since the first version was a bug fixed in the
"cpufreq: Add DVFS support for Armada 37xx" patch which was preventing
to register the opp. An other noticeable change is the 4th patch which
is new adding the use of dev_pm_opp_remove and removing an comment
became wrong. The other changes are described in the change log.

DVFS control is done by a set of registers from the North Bridge Power
Management block. The binding for this block is documented in patch 1.

While adding a new cpufreq driver I found that the Kconfig and
Makefile were no more in order, so it is fixed by patch 2 and 3.

The 5th patch is just about updating the MAINTAINERS file with the new
driver.

The next patch is the real purpose of the series. The main goal of
this driver is to setup the CPU load level in the hardware to
associate them to CPU frequencies and register a standard cpufreq
driver. Note that the hardware also capable of doing AVS (Adaptive
Voltage Scaling), by associating a voltage on each level beside the
CPU frequency. However, this support is not yet ready, so it is not
part of this series.

Finally, the last patch is for arm-soc the arm-soc subsystem through
mvebu and update the device tree to support the CPU frequency scaling.

An update on the CPU clock driver is needed in order to take into
account the DVFS setting. It's the purpose of an other series already
sent, but is no dependencies between the series (for building or at
runtime).

Thanks,

Gregory

Changelog:

v1 -> v2:

 - using syscon instead of nb_pm for the binding of the North bridge
   power management unit: reported by Rob Herring

 - fix sorting inside the big LITTLE section for the Kconfig: reported
   by Viresh Kumar

 - fix the bogus freq calculation in armada37xx_cpufreq_driver_init,
   bug reported by Andre Heider

 - use dev_pm_opp_remove() on the previous opp if dev_pm_opp_add()
   failed, reported by Viresh Kumar

 - add the Tested-by flag from Andre Heider on "cpufreq: Add DVFS
   support for Armada 37xx" patch

Gregory CLEMENT (7):
  dt-bindings: marvell: Add documentation for the North Bridge PM on
    Armada 37xx
  cpufreq: ARM: sort the Kconfig menu
  cpufreq: sort the drivers in ARM part
  cpufreq: mvebu: Use dev_pm_opp_remove()
  MAINTAINERS: add new entries for Armada 37xx cpufreq driver
  cpufreq: Add DVFS support for Armada 37xx
  arm64: dts: marvell: armada-37xx: add nodes allowing cpufreq support

 .../bindings/arm/marvell/armada-37xx.txt           |  19 ++
 MAINTAINERS                                        |   1 +
 arch/arm64/boot/dts/marvell/armada-372x.dtsi       |   1 +
 arch/arm64/boot/dts/marvell/armada-37xx.dtsi       |   7 +
 drivers/cpufreq/Kconfig.arm                        |  89 ++++----
 drivers/cpufreq/Makefile                           |   9 +-
 drivers/cpufreq/armada-37xx-cpufreq.c              | 241 +++++++++++++++++++++
 drivers/cpufreq/mvebu-cpufreq.c                    |  11 +-
 8 files changed, 327 insertions(+), 51 deletions(-)
 create mode 100644 drivers/cpufreq/armada-37xx-cpufreq.c

-- 
2.15.0

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