[PATCH v2 RESEND 0/2] Add SoundWire detach helper

[Charles Keepax]

Currently, if a SoundWire driver takes an action that causes the
device to detach from the bus it needs to be careful. There will be
a period of time until the detach is recognised by the core, if the
driver immediately calls sdw_slave_wait_for_init() it is possible for
that to complete before the detach has been recognised. Leaving the
driver with a device that is potentially not ready for what follows.

To avoid this race add a new helper that drivers can use to inform
the core the device will detach. This clears the enumeration
completions ensuring that sdw_slave_wait_for_init() can't complete
until the device re-attaches.

This is the third part of a longer series of moving these slave
attach/deatach operations into the core:

https://lore.kernel.org/linux-sound/20260512103022.1154645-1-ckeepax@xxxxxxxxxxxxxxxxxxxxx/
https://lore.kernel.org/linux-sound/20260608102714.2503120-1-ckeepax@xxxxxxxxxxxxxxxxxxxxx/

Changes since v1:
 - Correct kerneldoc

Charles Keepax (2):
  soundwire: Add a helper function to indicate a device will detach
  mfd: cs42l43: Move to core detach helper

 drivers/mfd/cs42l43-sdw.c     |  2 --
 drivers/mfd/cs42l43.c         | 15 +--------------
 drivers/soundwire/bus.h       |  6 ------
 include/linux/mfd/cs42l43.h   |  1 -
 include/linux/soundwire/sdw.h | 26 ++++++++++++++++++++++++++
 5 files changed, 27 insertions(+), 23 deletions(-)

-- 
2.47.3