[PATCH RFC 0/5] clk: let clock claim resources

[Jerome Brunet <jbrunet@baylibre.com>]

This patchset is a follow up on this pinky swear [0].
Its purpose is:
 * Clarify the acceptable use of clk_ops init() callback
 * Let the init() callback return an error code in case anything
   fail.
 * Add the terminate() counter part of of init() to release the
   resources which may have been claimed in init()
 * Add a per-clock placeholder for clock runtime data in the clock
   core. This may be useful to init() and save/restore_context()

It was initially suggested to rename these callbacks register/deregister().
But, 'register' is reserved word of C ... :P

In the end, after discussing with Mike, I decided to keep the name "init".
It does not feel that important to change this. I really don't mind
changing this if you feel differently and have a suggestion.

The last patch in this series is just an example of how the above can be
used.

This is sent as an RFC to get the discussion going without bothering too
many people.

In the final series, Patch 2 and 3 will probably be squashed and series
sent to a wider audience.

[0]: https://lkml.kernel.org/r/CAEG3pNB-143Pr_xCTPj=tURhpiTiJqi61xfDGDVdU7zG5H-2tA@mail.gmail.com

Jerome Brunet (5):
  clk: actually call the clock init before any other callback of the
    clock
  clk: let init callback return an error code
  clk: add terminate callback to clk_ops
  clk: add placeholder for clock internal data
  clk: meson: sclk-div: use runtime data

 drivers/clk/clk.c                     | 51 ++++++++++++++-----
 drivers/clk/meson/clk-mpll.c          |  4 +-
 drivers/clk/meson/clk-phase.c         |  4 +-
 drivers/clk/meson/clk-pll.c           |  4 +-
 drivers/clk/meson/sclk-div.c          | 72 +++++++++++++++++++--------
 drivers/clk/meson/sclk-div.h          |  2 -
 drivers/clk/microchip/clk-core.c      |  8 ++-
 drivers/clk/mmp/clk-frac.c            |  4 +-
 drivers/clk/mmp/clk-mix.c             |  4 +-
 drivers/clk/qcom/clk-hfpll.c          |  6 ++-
 drivers/clk/rockchip/clk-pll.c        | 28 +++++++----
 drivers/clk/ti/clock.h                |  2 +-
 drivers/clk/ti/clockdomain.c          |  8 +--
 drivers/net/phy/mdio-mux-meson-g12a.c |  4 +-
 include/linux/clk-provider.h          | 15 ++++--
 15 files changed, 154 insertions(+), 62 deletions(-)

-- 
2.21.0