[PATCH v2 0/9] Simplify MFD Core

[Lee Jones]

MFD currently has one over-complicated user.  CS5535 uses a mixture of
cell cloning, reference counting and subsystem-level call-backs to
achieve its goal of requesting an IO memory region only once across 3
consumers.  The same can be achieved by handling the region centrally
during the parent device's .probe() sequence.  Releasing can be handed
in a similar way during .remove().

While we're here, take the opportunity to provide some clean-ups and
error checking to issues noticed along the way.

This also paves the way for clean cell disabling via Device Tree being
discussed at [0]

[0] https://lkml.org/lkml/2019/10/18/612.

Lee Jones (9):
  mfd: cs5535-mfd: Use PLATFORM_DEVID_* defines and tidy error message
  mfd: cs5535-mfd: Remove mfd_cell->id hack
  mfd: cs5535-mfd: Request shared IO regions centrally
  mfd: cs5535-mfd: Register clients using their own dedicated MFD cell
    entries
  mfd: mfd-core: Remove mfd_clone_cell()
  x86: olpc: Remove invocation of MFD's .enable()/.disable() call-backs
  mfd: mfd-core: Protect against NULL call-back function pointer
  mfd: mfd-core: Remove usage counting for .{en,dis}able() call-backs
  mfd: mfd-core: Move pdev->mfd_cell creation back into mfd_add_device()

 arch/x86/platform/olpc/olpc-xo1-pm.c |   6 --
 drivers/mfd/cs5535-mfd.c             | 124 +++++++++++++--------------
 drivers/mfd/mfd-core.c               | 113 ++++--------------------
 include/linux/mfd/core.h             |  20 -----
 4 files changed, 79 insertions(+), 184 deletions(-)

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2.17.1