clk: intel: Add a new driver for a new clock controller IP

Hi,

This series adds clock driver for Clock Generation Unit(CGU) of
Lightning Mountain(LGM) SoC.

Patch 1 adds common clock framework based clock driver for CGU.
Patch 2 adds bindings document & include file for CGU.

These patches are baselined upon Linux 5.5-rc1 at below Git link:
git git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git

v3:
- Address review concerns:
  Add Kconfig entry in x86 folder instead of modifying clk/Kconfig. (Andy Shevchenko)
  Fix coding style/convention related concerns. (Andy Shevchenko)
  Improve description, licensing info, rename node name correctly in dt bindings
  document & remove CLK_NR_CLKS from dt-bindings header file. (Stephen Boyd)
  Fix a build warning reported by kbuild test robot & Nathan Chancellor
- Add few new clocks & rename few existing clocks.
- Add more ops for ddiv & divider clk_ops.
- Fix few minor bugs.
- Use CLK_IS_CRITICAL flag for clocks which shall never be disabled.

v2:
- Move the driver to x86 folder.
- Remove syscon usage.
- Remove regmap based access. Use direct readl()/write() instead. Add spinlocks.
- Change all enum values to capitals.
- Rename all data structures & functions from intel_* to lgm_*.
- Remove multiple header files. Keep only one header file.
- Make probe fail when any of the clk/pll registration fails.
- Fix few bugs with clk_init_data assignement.
- Address review concerns for code quality/style/convention.

v1:
- Initial version.

Rahul Tanwar (1):
  dt-bindings: clk: intel: Add bindings document & header file for CGU

rtanwar (1):
  clk: intel: Add CGU clock driver for a new SoC

 .../devicetree/bindings/clock/intel,cgu-lgm.yaml   |  40 ++
 drivers/clk/Kconfig                                |   1 +
 drivers/clk/x86/Makefile                           |   1 +
 drivers/clk/x86/clk-cgu-pll.c                      | 189 ++++++
 drivers/clk/x86/clk-cgu.c                          | 714 +++++++++++++++++++++
 drivers/clk/x86/clk-cgu.h                          | 309 +++++++++
 drivers/clk/x86/clk-lgm.c                          | 466 ++++++++++++++
 include/dt-bindings/clock/intel,lgm-clk.h          | 165 +++++
 8 files changed, 1885 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/intel,cgu-lgm.yaml
 create mode 100644 drivers/clk/x86/clk-cgu-pll.c
 create mode 100644 drivers/clk/x86/clk-cgu.c
 create mode 100644 drivers/clk/x86/clk-cgu.h
 create mode 100644 drivers/clk/x86/clk-lgm.c
 create mode 100644 include/dt-bindings/clock/intel,lgm-clk.h

-- 
2.11.0