[PATCH v6 0/4] Add Mediatek MT8173 cpufreq driver

[Pi-Cheng Chen]

MT8173 is a ARMv8 based SoC with 2 clusters. All CPUs in a single cluster
share the same power and clock domain. This series tries to add cpufreq support
for MT8173 SoC.

changes in v6:
- Move clock and regulator consumer properties document to the device tree
  bindings documents of MT8173 CPU DVFS clock driver
- Add change log to describe what is implemented in the MT8173 cpufreq driver
- Add missed rcu_read_unlock() in the error path
- Move of_init_opp_table() call to make sure all required hardware resources
  are already there before it is called
- Add comments to describe why both platform driver and deivce registration
  codes are put in the initcall function
- Use the term "voltage tracking" instead of "voltage trace" according to an
  internal SoC document

changes in v5:
- Move resource allocation code from init() into probe() and remove some unused
  functions due to this change
- Fix descriptions for device tree binding document
- Address review comments for last version
- Register CPU cooling device

Changes in v4:
- Add bindings for MT8173 cpufreq driver
- Move OPP table back into device tree
- Address comments for last version

Changes in v3:
- Implement MT8173 specific standalone cpufreq driver instead of using
  cpufreq-dt driver
- Define OPP table in the driver source code until new OPP binding is ready

Changes in v2:
- Add intermediate frequency support in cpufreq-dt driver
- Use voltage scaling code of cpufreq-dt for little cluster instead of
  implementaion in notifier of mtk-cpufreq driver
- Code refinement for mtk-cpufreq driver

Pi-Cheng Chen (4):
  dt-bindings: mediatek: Add MT8173 CPU DVFS clock bindings
  dt-bindings: mediatek: Add MT8173 cpufreq driver bindings
  cpufreq: mediatek: Add MT8173 cpufreq driver
  arm64: dts: mt8173: Add mt8173 cpufreq driver support

 .../devicetree/bindings/clock/mt8173-cpu-dvfs.txt  |  83 ++++
 .../devicetree/bindings/cpufreq/cpufreq-mt8173.txt | 134 ++++++
 arch/arm64/boot/dts/mediatek/mt8173-evb.dts        |  18 +
 arch/arm64/boot/dts/mediatek/mt8173.dtsi           |  64 +++
 drivers/cpufreq/Kconfig.arm                        |   7 +
 drivers/cpufreq/Makefile                           |   1 +
 drivers/cpufreq/mt8173-cpufreq.c                   | 524 +++++++++++++++++++++
 7 files changed, 831 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/mt8173-cpu-dvfs.txt
 create mode 100644 Documentation/devicetree/bindings/cpufreq/cpufreq-mt8173.txt
 create mode 100644 drivers/cpufreq/mt8173-cpufreq.c

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1.9.1