netdev - [RFC PATCH v2 net-next 0/8] Add support for VSC7511-7514 chips over SPI

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Date:   Sat, 10 Jul 2021 12:25:54 -0700
From:   Colin Foster <colin.foster@...advantage.com>
To:     andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        olteanv@...il.com, davem@...emloft.net, kuba@...nel.org,
        robh+dt@...nel.org, claudiu.manoil@....com,
        alexandre.belloni@...tlin.com, UNGLinuxDriver@...rochip.com,
        linux@...linux.org.uk
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH v2 net-next 0/8] Add support for VSC7511-7514 chips over SPI

Add support for configuration and control of the VSC7511, VSC7512, VSC7513, and
VSC7514 chips over a SPI interface. The intent is to control these chips from an
external CPU. The expectation is to have most of the features of the
net/ethernet/mscc/ocelot_vsc7514 driver.

I have tried to heed all the advice from my first patch RFC. Thanks to everyone
for all the feedback.

The current status is that there are two functional "bugs" that need
investigation:
1. The first probe of the internal MDIO bus fails. I suspect this is related to
power supplies / grounding issues that would not appear on standard hardware.
2. Communication to the CPU bus doesn't seem to function properly. I suspect
this is due to the fact that ocelot / felix assumes it is using the built-in CPU
/ NPI port for forwarding, though I am not positive.

Nonetheless, these two issues likely won't require a large architecture change,
and perhaps those who know much more about the ocelot chips than I could chime
in.

Colin Foster (8):
  net: dsa: ocelot: remove unnecessary pci_bar variables
  net: dsa: ocelot: felix: move MDIO access to a common location
  net: dsa: ocelot: felix: NULL check on variable
  net: dsa: ocelot: felix: add interface for custom regmaps
  net: mscc: ocelot: split register definitions to a separate file
  net: mscc: ocelot: expose ocelot wm functions
  net: dsa: ocelot: felix: add support for VSC75XX control over SPI
  Update documentation for the VSC7512 SPI device

 .../devicetree/bindings/net/dsa/ocelot.txt    |   68 ++
 drivers/net/dsa/ocelot/Kconfig                |   12 +
 drivers/net/dsa/ocelot/Makefile               |    7 +
 drivers/net/dsa/ocelot/felix.c                |    6 +-
 drivers/net/dsa/ocelot/felix.h                |    4 +-
 drivers/net/dsa/ocelot/felix_mdio.c           |  145 +++
 drivers/net/dsa/ocelot/felix_mdio.h           |   11 +
 drivers/net/dsa/ocelot/felix_vsc9959.c        |   12 +-
 drivers/net/dsa/ocelot/ocelot_vsc7512_spi.c   | 1068 +++++++++++++++++
 drivers/net/dsa/ocelot/seville_vsc9953.c      |  109 +-
 drivers/net/ethernet/mscc/Makefile            |    2 +
 drivers/net/ethernet/mscc/ocelot.c            |    8 +
 drivers/net/ethernet/mscc/ocelot_regs.c       |  310 +++++
 drivers/net/ethernet/mscc/ocelot_vsc7514.c    |  323 +----
 drivers/net/ethernet/mscc/ocelot_wm.c         |   40 +
 include/soc/mscc/ocelot.h                     |   24 +
 include/soc/mscc/ocelot_regs.h                |   21 +
 17 files changed, 1737 insertions(+), 433 deletions(-)
 create mode 100644 drivers/net/dsa/ocelot/felix_mdio.c
 create mode 100644 drivers/net/dsa/ocelot/felix_mdio.h
 create mode 100644 drivers/net/dsa/ocelot/ocelot_vsc7512_spi.c
 create mode 100644 drivers/net/ethernet/mscc/ocelot_regs.c
 create mode 100644 drivers/net/ethernet/mscc/ocelot_wm.c
 create mode 100644 include/soc/mscc/ocelot_regs.h

--
2.25.1