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[RFC,0/3] Add clk_disable_unprepare_sync()

Message ID 20240131160947.96171-1-biju.das.jz@bp.renesas.com (mailing list archive)
Headers show
Series Add clk_disable_unprepare_sync() | expand

Message

Biju Das Jan. 31, 2024, 4:09 p.m. UTC 
Currently clk_disable() is not synchronous. Consumers just
gate the clock, but it doesn't check actually the clock is
gated.

On RZ/G2L SMARC EVK before starting link reception we need to
make sure the video clock is off, then start reception and
turn video clock back to on.

Introduce clk_disable_unprepare_sync() to synchronize
the clock gate operation.

Note:
 patch#3 depend upon [1]

[1] https://patchwork.kernel.org/project/linux-renesas-soc/patch/20240130164115.116613-5-biju.das.jz@bp.renesas.com/

Biju Das (3):
  clk: Add clk_disable_unprepare_sync()
  clk: renesas: rzg2l: Add disable_sync() callback
  media: platform: rzg2l-cru: rzg2l-video: Use
    clk_disable_unprepare_sync()

 drivers/clk/clk.c                             | 36 ++++++++++++++-----
 drivers/clk/renesas/rzg2l-cpg.c               | 23 ++++++++++++
 .../platform/renesas/rzg2l-cru/rzg2l-csi2.c   |  2 +-
 include/linux/clk-provider.h                  |  4 +++
 include/linux/clk.h                           | 25 +++++++++++++
 5 files changed, 80 insertions(+), 10 deletions(-)