[RESEND,0/5] cpufreq: ti-cpufreq: Enable AM625 CPUFreq

Message

Vibhore Vardhan Nov. 1, 2022, 6:09 p.m. UTC

Apologies, resending because I botched the label in previous series.
Please reply to this series rather than the one sent previously.

Hi,
This series enables CPUFreq for AM625. This version is a fixup and
rebase of the patch series by Dave Gerlach on v6.1-rc3 [1].

It updates the ti-cpufreq driver to support parsing of the speed grade
value out of the JTAG_USER_ID register and adds necessary support code
to use cpufreq-dt.

The operating-points table that gets added support 200,400,600,800 for
all variants and then 1GHz for the S Speed grade only and 1.25 for the T
Speed grade only. 1.4GHz has been added in board specific dts file as it
requires VDD_CORE to be at 0.85V.

The latency between pre and post frequency transition was measured in
CPUFreq driver for all combinations of OPP changes. The average value
was selected as overall clock-latency.

Tested on am62-sk board using manual frequency changes and then reading
back frequency with k3conf, and this shows matching frequency to what
was set.

This should not impact existing K3 platforms that do not have operating
points table defined.

Regards,
Vibhore

[1] https://github.com/dgerlach/linux-pm/tree/v5.18/am62x-cpufreq

Dave Gerlach (4):
  cpufreq: ti-cpufreq: Add support for AM625
  cpufreq: dt-platdev: Blacklist ti,am625 SoC
  arm64: dts: ti: k3-am625: Introduce operating-points table
  cpufreq: ti: Enable ti-cpufreq for ARCH_K3

Vibhore Vardhan (1):
  arm64: dts: ti: k3-am625-sk: Add 1.4GHz OPP

 arch/arm64/boot/dts/ti/k3-am625-sk.dts |  9 +++++
 arch/arm64/boot/dts/ti/k3-am625.dtsi   | 51 ++++++++++++++++++++++++++
 drivers/cpufreq/Kconfig.arm            |  4 +-
 drivers/cpufreq/cpufreq-dt-platdev.c   |  1 +
 drivers/cpufreq/ti-cpufreq.c           | 36 ++++++++++++++++++
 5 files changed, 99 insertions(+), 2 deletions(-)

Comments

Viresh Kumar Nov. 7, 2022, 10:02 a.m. UTC | #1

On 01-11-22, 13:09, Vibhore Vardhan wrote:
> Apologies, resending because I botched the label in previous series.
> Please reply to this series rather than the one sent previously.
> 
> Hi,
> This series enables CPUFreq for AM625. This version is a fixup and
> rebase of the patch series by Dave Gerlach on v6.1-rc3 [1].
> 
> It updates the ti-cpufreq driver to support parsing of the speed grade
> value out of the JTAG_USER_ID register and adds necessary support code
> to use cpufreq-dt.
> 
> The operating-points table that gets added support 200,400,600,800 for
> all variants and then 1GHz for the S Speed grade only and 1.25 for the T
> Speed grade only. 1.4GHz has been added in board specific dts file as it
> requires VDD_CORE to be at 0.85V.
> 
> The latency between pre and post frequency transition was measured in
> CPUFreq driver for all combinations of OPP changes. The average value
> was selected as overall clock-latency.
> 
> Tested on am62-sk board using manual frequency changes and then reading
> back frequency with k3conf, and this shows matching frequency to what
> was set.
> 
> This should not impact existing K3 platforms that do not have operating
> points table defined.

Applied. Thanks.