Merge branch 'rework-resource-allocation-in-felix-dsa-driver'

Vladimir Oltean says:

====================
Rework resource allocation in Felix DSA driver

The Felix DSA driver controls NXP variations of Microchip switches.
Colin Foster is trying to add support in this driver for "genuine"
Microchip hardware, but some of the NXP-isms in this driver need to go
away before that happens cleanly.
https://patchwork.kernel.org/project/netdevbpf/cover/20220926002928.2744638-1-colin.foster@in-advantage.com/

The starting point was Colin's patch 08/14 "net: dsa: felix: update
init_regmap to be string-based", and this continues to be the central
theme here, but things are done differently.

In short (full explanations are in patches), the goal is for MFD-based
switches like Colin's SPI-controlled VSC7512 to be able to request a
regmap that was created 100% externally (by drivers/mfd/ocelot-core.c)
in a very simple way, that does not create dependencies on other
modules. That is dev_get_regmap(), and as input it wants a string, for
the resource name. So we rework the resource allocation in this driver
to be based on string names provided by the specific instantiation (in
Colin's case, ocelot_ext.c).

Patch set was boot-tested on NXP LS1028A.
====================

Link: https://lore.kernel.org/r/20220927191521.1578084-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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