[PATCH 0/6] Add CPU Frequency scaling support on Armada 37xx

[Andre Heider]

Hi Gregory,

I applied this and the dvfs patch set ([PATCH 0/3] Add DVFS support on 
CPU clock for Armada 37xx) on top of 4.14.3 and gave it a try on 
espressobin.

Upon modprobe I get:
[   66.231652] freq_table: Duplicate freq-table entries: 0
[   66.236967] cpu cpu0: cpufreq_init: invalid frequency table: -22
[   66.243534] freq_table: Duplicate freq-table entries: 0
[   66.248575] cpu cpu1: cpufreq_init: invalid frequency table: -22

Is this supposed to work already? Do I miss something?

Oh, and on that scenario it's not possible to rmmod the driver again, EBUSY.

Thanks,
Andre

On 01/12/17 12:25, Gregory CLEMENT <gregory.clement at free-electrons.com> 
wrote:
> Hi,
> 
> This series adds the CPU Frequency support on Armada 37xx using
> DVFS. It is based on the initial work of Evan Wang and Victor Gu.
> 
> 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 4th 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
> 
> Gregory CLEMENT (6):
>    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
>    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 +++++++++++++++++++++
>   7 files changed, 322 insertions(+), 45 deletions(-)
>   create mode 100644 drivers/cpufreq/armada-37xx-cpufreq.c
>