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

These patches are baselined upon Linux 5.7-rc1 at below Git link:
git git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git

v8:
- Rebase to linux 5.7-rc1.

v7:
- Fix a mistake in comments explaining structure fields.

v6:
- Resolve Kconfig dependencies issues (Randy Dunlap)

v5:
- Address review concerns - mainly below mentioned. (Stephen Boyd)
- Improve commit message, add COMPILE_TEST in KConfig dependency.
- Remove unused header include files, drop unnecessary casts.
- Switch to using readl_poll_timeout() instead of implementing timeout routine.
- Avoid using small functions which are called just once. Inline them or remove them.
- const static --> static const
- Fix coding style/convention related review concerns.
- Use __iomem for all IO addresses variables.
- Consolidate clk_enable & clk_disable ops into a common clk_enable_disable routine to avoid redundant code.
- Remove unnecessary dev pointers for clk data structures.
- Redesign code to use new way of specifying clk_parents i.e. use clk_parent_data.fw_name instead of older parent_name strings.
- Switch from raw_spin_locks() to normal spin_locks() and realign locking.
- Drop __initconst, __init, __refdata.
- Reorder patch series - make dt-binding patch as first patch.
- Add pointer to include file in dt-bindings document.
- Remove CLK_IS_CRITICAL flag for clks for which IGNORE_UNUSED flag is enough. Add comments for clks which are marked as CRITICAL.
- Fix $id path in dt-bindings - drop bindings. (Rob Herring).
- Add Reviewed-by tag from Rob Herring. Thanks Rob.

v4:
- Add drivers/clk/x86/Kconfig file which got missed in v3 by mistake.

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   |  44 ++
 drivers/clk/Kconfig                                |   1 +
 drivers/clk/x86/Kconfig                            |   8 +
 drivers/clk/x86/Makefile                           |   1 +
 drivers/clk/x86/clk-cgu-pll.c                      | 156 +++++
 drivers/clk/x86/clk-cgu.c                          | 636 +++++++++++++++++++++
 drivers/clk/x86/clk-cgu.h                          | 335 +++++++++++
 drivers/clk/x86/clk-lgm.c                          | 492 ++++++++++++++++
 include/dt-bindings/clock/intel,lgm-clk.h          | 165 ++++++
 9 files changed, 1838 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/intel,cgu-lgm.yaml
 create mode 100644 drivers/clk/x86/Kconfig
 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