[PATCH v7 0/8] Add MV88E6xxx DSA driver and use on gwventana

[Tim Harvey]

This series adds a DSA driver for the MV88E6xxx based on
drivers/net/phy/mv88e61xx and uses it in the gwventana_gw5904_defconfig.

The hope is that the other three boards that use the MV88E61xx driver
can move to this as well eventually so that we can remove the non-dm
driver and the 4 Kconfig options it requires.

The MV88E6xxx has an MDIO interface thus DM_MDIO must be used so support
for a UCLASS_MDIO driver is added to the fec_mxc ethernet driver in a
way that allows a fallback to the previous non DM_MDIO case as there are
many boards out there using this driver that define DM_MDIO but do not
have the required dt props for a DM_MDIO driver which would cause a
regression.

Additionally some other patches are here suggested by Vladimir:
 - ensure MDIO children are scanned on post-bind is needed
 - sanity check DSA driver required ops are present
 - allow DSA drivers to not require xmit/recv functions
 - remove unecessary xmit/recv functions from ksz9477 driver

v7:
 - rebase on master
 - update commit short msg (s/MV88E61xx/MV88E6xxx)
 - replace inline smi_cmd* with macros using logical operators
 - replace bitfield_replace with logical operators for readibility
 - removed some unused register definitions
 - config switch based SERDES mode once in probe vs port_enable
 - rework port_enable to clean up and:
  - enable energy-detect for all non fixed PHY ports
  - configure RGMII delays based on interface type
 - add Vladimir's rb tag to patch 8

v6:
 - update commit messages
 - squash accidently change to mv88e6xxx driver into previous patch
 - remove unused dt label for cpu port
 - removed unnecessary semicolon
 - update commit msg (s/MV88E61xx/MV88E6xxx)
 - remove GbE from commit msg and Kconfig desc
 - squash accidental change from patch 7 into patch 6
 - added error print on failure to read switch id
 - mv88e6xxx_probe:
  - check for switch enabled
  - remove unused variable enabled
  - remove unnecessary call to dsa_set_tagging
 - port_probe:
  - new function to configure phy features by calling phy_config
 - port_enable:
  - only enable energy-detect sensing on phy ports
  - add phy/cmode verification mistmatch warning
  - remove mv88e6xxx_fixed_port_setup()
  - always force link up for fixed ports
  - always set SERDES mode regardless of cpu port
  - remove unnecessary setting of CPUDEST
 - port_disable:
  - remove pointless error check
 - removed unnecessary priv data for mdio controller
 - fix indentation
 - change variable name for clarity

v5:
 - fix typo in defconfig update
 - added support for MV88E6320
 - added Fabio's rb tag

v4:
 - use standard Linux internal MDIO dt structure
 - use PHY_FIXED_ID define
 - rename to mv88e6xxx
 - sort includes alphabetically
 - remove dsa term from function names
 - reduce indentation level and remove unecessary code in of probe_mdio
   function
 - rename pdev to mdev to represent mdio device

v3:
 - fix mdios node in dt
 - add Vladimir's rb tag's

v2:
 - added Ramon's rb tag's to first two patches
 - add patches for dsa-uclass to sanity check ops and make xmit/recv
   optional
 - fec: fix fallback for non conforming DM_MDIO dts
 - mv88e61xx:
  - rebase on v2022.07-rc2 (use ofnode_get_phy_node)
  - remove unused commented out fields from struct
  - remove unused PORT_MASK macro
  - remove phy from priv struct name
  - refactor code from original drivers/net/phy/mv88e61xx with
    suggestions from review to consolidate some functions
    into mv88e61xx_dsa_port_enable
  - remove unecessary skiping of disabling of CPU port
  - remove unecessary dev_set_parent_priv
  - remove unnecessary static init flag
  - replace debug with a dev_warn if switch device-id unsupported
  - remove unnecessary xmit/recv functions as we rely on the fact that
    only a single port is active instead of mangling packets

Tested on a Gateworks GW5904 which has a Marvell 88E6176 switch hanging
off the IMX6 FEC.

Best Regards,

Tim

Tim Harvey (8):
  net: mdio-uclass: scan for dm mdio children on post-bind
  net: dsa: move cpu port probe to dsa_post_probe
  net: dsa: ensure dsa driver has proper ops
  net: dsa: allow rcv() and xmit() to be optional
  net: ksz9477: remove unnecessary xmit and recv functions
  net: fec: add support for DM_MDIO
  net: add MV88E6xxx DSA driver
  board: gw_ventana: enable MV88E61XX DSA support

 arch/arm/dts/imx6qdl-gw5904.dtsi        |  32 +-
 board/gateworks/gw_ventana/gw_ventana.c |  50 +-
 configs/gwventana_gw5904_defconfig      |   7 +-
 drivers/net/Kconfig                     |   7 +
 drivers/net/Makefile                    |   1 +
 drivers/net/fec_mxc.c                   |  90 ++-
 drivers/net/ksz9477.c                   |  23 -
 drivers/net/mv88e6xxx.c                 | 795 ++++++++++++++++++++++++
 net/dsa-uclass.c                        |  55 +-
 net/mdio-uclass.c                       |   4 +
 10 files changed, 992 insertions(+), 72 deletions(-)
 create mode 100644 drivers/net/mv88e6xxx.c

-- 
2.25.1