Merge branch 'net-dsa-microchip-error-hndling-reg-access-validation'

Oleksij Rempel says:

====================
net: dsa: microchip: add error handling and register access validation

changes v4:
- add Reviewed-by: Vladimir Oltean <olteanv@gmail.com> to all patches
- fix checkpatch warnings.

changes v3:
- fix build error in the middle of the patch stack.

changes v2:
- add regmap_ranges for KSZ9477
- drop output clock devicetree in driver validation patches. DTs need
  some more refactoring and can be done in a separate patch set.
- remove some unused variables.

This patch series adds error handling for the PHY read/write path and optional
register access validation.
After adding regmap_ranges for KSZ8563 some bugs was detected, so
critical bug fixes are sorted before ragmap_range patch.

Potentially this bug fixes can be ported to stable kernels, but need to be
reworked.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>