[PATCH v4 0/3] clk: samsung: Add PM support for ARM64 Exynos chips

[Sam Protsenko]

In order to prepare for PM enablement in clk-exynos850, common PM code
was extracted from clk-exynos5433 to clk-exynos-arm64. Also some related
cleanups were done prior to that. More specifically:

  - patches #1..2: cleanups
  - patch #3: PM code extraction

During the extraction of the exynos5433_cmu_probe() content to
exynos_arm64_register_cmu_pm() some code was reworked a bit, and also
split into smaller functions. In particular:

  - cmu_data structure now contains a pointer to ctx, which is now
    allocated in samsung_clk_init()
  - cmu_data structure initialization was moved into separate function
  - code for configuring gate clocks was added (optional)

Which in turn resulted in somehow modified code of probe function:

  Original
  --------

    ...
    devm_platform_ioremap_resource(...);
    samsung_clk_init(...);
    exynos_arm64_cmu_prepare_pm(...);
    exynos_arm64_enable_bus_clk(...);
    platform_set_drvdata(...);
    ...

  Modified
  --------

    ...
    platform_set_drvdata(...);
    exynos_arm64_cmu_prepare_pm(...);
    exynos_arm64_enable_bus_clk(...);
    exynos_arm64_init_clocks(...);
    devm_platform_ioremap_resource(...);
    samsung_clk_init(...);
    ...

That shouldn't really change the logic or mode of operation. It was
preliminary tested on Exynos850 based board, with some extra patches on
top of this series (will be submitted later).

Changes in v4:
  - Rebased on top of krzk/linux.git/for-next tree
  - Reworked exynos_arm64_enable_bus_clk() users to only print an error
    message if that function fails
  - Removed already applied patches from this series

Changes in v3:
  - Rebased on the most recent soc/for-next tree
  - Added A-b tags from Marek
  - Added Marek's authorship to clk-exynos-arm64.c

Changes in v2:
  - Rebased all patches on top of the latest soc/for-next tree
  - Added Tested-by tag from Marek
  - Addressed comments from the review

Sam Protsenko (3):
  clk: samsung: Extract clocks registration to common function
  clk: samsung: Extract parent clock enabling to common function
  clk: samsung: exynos5433: Extract PM support to common ARM64 layer

 drivers/clk/samsung/clk-exynos-arm64.c | 229 +++++++++++++++++++++++--
 drivers/clk/samsung/clk-exynos-arm64.h |   3 +
 drivers/clk/samsung/clk-exynos5433.c   | 157 +----------------
 drivers/clk/samsung/clk.c              |  46 +++--
 drivers/clk/samsung/clk.h              |   2 +
 5 files changed, 249 insertions(+), 188 deletions(-)

-- 
2.39.2