[V3,00/15] cpufreq: mediatek: Cleanup and support MT8183 and MT8186

Cpufreq is a DVFS driver used for power saving to scale the clock frequency
and supply the voltage for CPUs. This series do some cleanup for MediaTek
cpufreq drivers and add support for MediaTek SVS[2] and MediaTek CCI
devfreq[3] which are supported in MT8183 and MT8186.

Changes for V3:
1. Rebased to linux-next-20220414.
2. Drop accepted patches.
3. Drop "cpufreq: mediatek: Use maximum voltage in init stage" because we
   make sure the voltage we set is safe for both mediatek cci and cpufreq.
4. Rename cci property to mediatek,cci.
5. Adjust order of cleanup patches.
6. Add new patches for cleanup, handle infinite loop and MT8183 dts.
7. Revise drivers from reviewers' suggestion.
8. Revise commit message of some patches to avoid confusion and misunderstand.
9. Revise "cpufreq: mediatek: Link CCI device to CPU".
   We do not return successful to pretend we set the target frequency done
   when cci is not ready. Instead, we find and set a safe voltage so that we
   can set the target cpufrequency.

Changes for V2:
1. Drop the modification of transforming cpufreq-mediatek into yaml and
   only add the MediaTek CCI property for MediaTek cpufreq.
2. Split the original patches into several patches.

Reference series:
[1]: V1 of this series is present by Jia-Wei Chang.
     message-id:20220307122151.11666-1-jia-wei.chang@mediatek.com

[2]: The MediaTek CCI devfreq driver is introduced in another series.
     message-id:20220408052150.22536-1-johnson.wang@mediatek.com

[3]: The MediaTek SVS driver is introduced in another series.
     message-id:20220221063939.14969-1-roger.lu@mediatek.com

Andrew-sh.Cheng (1):
  cpufreq: mediatek: Add opp notification support

Jia-Wei Chang (8):
  dt-bindings: cpufreq: mediatek: Add MediaTek CCI property
  cpufreq: mediatek: Record previous target vproc value
  cpufreq: mediatek: Move voltage limits to platform data
  cpufreq: mediatek: Add .get function
  cpufreq: mediatek: Make sram regulator optional
  cpufreq: mediatek: Refine mtk_cpufreq_voltage_tracking()
  cpufreq: mediatek: Link CCI device to CPU
  cpufreq: mediatek: Add support for MT8186

Rex-BC Chen (6):
  cpufreq: mediatek: Use device print to show logs
  cpufreq: mediatek: Replace old_* with pre_*
  cpufreq: mediatek: Add counter to prevent infinite loop when tracking voltage
  arm64: dts: mediatek: Add opp table and clock property for MT8183 cpufreq
  arm64: dts: mediatek: Add MediaTek CCI node for MT8183
  arm64: dts: mediatek: Add mediatek,cci property for MT8183 cpufreq

 .../bindings/cpufreq/cpufreq-mediatek.txt     |   5 +
 arch/arm64/boot/dts/mediatek/mt8183-evb.dts   |  36 ++
 .../arm64/boot/dts/mediatek/mt8183-kukui.dtsi |   4 +
 arch/arm64/boot/dts/mediatek/mt8183.dtsi      | 285 ++++++++++
 drivers/cpufreq/mediatek-cpufreq.c            | 497 ++++++++++++------
 5 files changed, 664 insertions(+), 163 deletions(-)