Merge branch 'validate-of-nodes-for-dsa-shared-ports'

Vladimir Oltean says:

====================
Validate OF nodes for DSA shared ports

This is the first set of measures taken so that more drivers can be
transitioned towards phylink on shared (CPU and DSA) ports some time in
the future. It consists of:

- expanding the DT schema for DSA and related drivers to clarify the new
  requirements.

- introducing warnings for drivers that currently skip phylink due to
  incomplete DT descriptions.

- introducing warning for drivers that currently skip phylink due to
  using platform data (search for struct dsa_chip_data).

- closing the possibility for new(ish) drivers to skip phylink, by
  validating their DT descriptions.

- making the code paths used by shared ports more evident.

- preparing the code paths used by shared ports for further work to fake
  a link description where that is possible.

More details in patch 10/10.

DT binding (patches 1-6) and kernel (7-10) are in principle separable,
but are submitted together since they're part of the same story.

Patches 8 and 9 are DSA cleanups, and patch 7 is a dependency for patch
10.

v1 at
https://patchwork.kernel.org/project/netdevbpf/patch/20220723164635.1621911-1-vladimir.oltean@nxp.com/

v2 at
https://patchwork.kernel.org/project/netdevbpf/patch/20220729132119.1191227-5-vladimir.oltean@nxp.com/

v3 at
https://patchwork.kernel.org/project/netdevbpf/cover/20220806141059.2498226-1-vladimir.oltean@nxp.com/
====================

Link: https://lore.kernel.org/r/20220818115500.2592578-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>