From: Linus Walleij <redacted>
Date: Sat, 30 Jun 2018 13:17:31 +0200

This adds a DSA driver for:

Vitesse VSC7385 SparX-G5 5-port Integrated Gigabit Ethernet Switch
Vitesse VSC7388 SparX-G8 8-port Integrated Gigabit Ethernet Switch
Vitesse VSC7395 SparX-G5e 5+1-port Integrated Gigabit Ethernet Switch
Vitesse VSC7398 SparX-G8e 8-port Integrated Gigabit Ethernet Switch

These switches have a built-in 8051 CPU and can download and execute
firmware in this CPU. They can also be configured to use an external
CPU handling the switch in a memory-mapped manner by connecting to
that external CPU's memory bus.

This driver (currently) only takes control of the switch chip over
SPI and configures it to route packages around when connected to a
CPU port. The chip has embedded PHYs and VLAN support so we model it
using DSA as a best fit so we can easily add VLAN support and maybe
later also exploit the internal frame header to get more direct
control over the switch.

The four built-in GPIO lines are exposed using a standard GPIO chip.

Signed-off-by: Linus Walleij <redacted>
---
ChangeLog v1->v2:
- Update .get_strings() and .get_sset_count() to match the signature
  with the new argument for sset type.
- Drop DSA trailer select from Kconfig.
- Use MII_* namespace definitions instead of hard-coded hex
  values and calls to read into the PHY: instead use the genphy
  decoded link state already present in the phydev.
- Drop extraneous port number check in .enable() and .disable(),
  this should not happen.
- Move the GPIO chip set-up into a separate function.
- Add some missing static in front of a counter function.
- Drop the bool flags in the state container, use some macros with
  the chipid to identify model instead like IS_VSC739X().
- Check phydev->interface() for configuring the CPU port into
  RGMII mode.

Applied.