i2c_new_dummy is typically called from the probe function of the
driver for the primary i2c client. It requires calls to
i2c_unregister_device in the error path of the probe function and
in the remove function.
This can be simplified by introducing a device-managed version.

Make at24 driver the first user of the new function.

Changes in v2:
- add change to i2c core to make a version of i2c_new_device
  available which returns an ERR_PTR instead of NULL in error case
- few minor improvements

Changes in v3:
- rename _i2c_new_device to __i2c_new_device

Changes in v4:
- add missing kernel doc comments
- add Reviewed-by

Changes in v5:
- fix a copy & paste error in patch 1
- improve readability in patch 2

Changes in v5:
- cosmetic change in patch 1
- patch 3 rebased on top of latest at24/for-next

Heiner Kallweit (3):
  i2c: core: improve return value handling of i2c_new_device and i2c_new_dummy
  i2c: core: add device-managed version of i2c_new_dummy
  eeprom: at24: switch to device-managed version of i2c_new_dummy

 Documentation/driver-model/devres.txt |   3 +
 drivers/i2c/i2c-core-base.c           | 115 ++++++++++++++++++++++++++++++----
 drivers/misc/eeprom/at24.c            |  32 ++++------
 include/linux/i2c.h                   |   3 +
 4 files changed, 119 insertions(+), 34 deletions(-)


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