[PATCH net-next v8 00/16] add support for Renesas RZ/N1 ethernet subsystem devices

[Clément Léger]

The Renesas RZ/N1 SoCs features an ethernet subsystem which contains
(most notably) a switch, two GMACs, and a MII converter [1]. This
series adds support for the switch and the MII converter.

The MII converter present on this SoC has been represented as a PCS
which sit between the MACs and the PHY. This PCS driver is probed from
the device-tree since it requires to be configured. Indeed the MII
converter also contains the registers that are handling the muxing of
ports (Switch, MAC, HSR, RTOS, etc) internally to the SoC.

The switch driver is based on DSA and exposes 4 ports + 1 CPU
management port. It include basic bridging support as well as FDB and
statistics support.

This series needs commits 14f11da778ff6421 ("soc: renesas: rzn1: Select
PM and PM_GENERIC_DOMAINS configs") and ed66b37f916ee23b ("ARM: dts:
r9a06g032: Add missing '#power-domain-cells'") which are available on
the renesas-devel tree in order to enable generic power domain on
RZ/N1.

Link: [1] https://www.renesas.com/us/en/document/mah/rzn1d-group-rzn1s-group-rzn1l-group-users-manual-r-engine-and-ethernet-peripherals

-----
Changes in V8:
- Commits:
  - Reorder Acked-By and Rewieved-by chronologically adn add Florian
    Fainelli Reviewed-By.
- PCS:
  - Fix of node leaks
- MAINTAINERS:
  - Reorder L: before S:

Resent V7 due to messed up cover letter.

Changes in V7:
- Commits:
  - Add Rob Herring Acked-by for commit "dt-bindings: net: snps,dwmac: add
    "power-domains" property"
  - Rebased on net-next/master
- MAINTAINERS:
  - Add renesas-soc and netdev mailing lists

Changes in V6:
- Commits:
  - Add commit which enable ethernet switch on RZ/N1D-DB board
  - Add commit which adds "renesas,rzn1-gmac" compatible t
    "snps,dwmac" bindings
  - Fix mutex change being done in FDB feature commit
  - Add commit which  adds"power-domains" to "snps,dwmac" bindings
- Bindings and DT
  - Add clock-names to MII converter and make it required
  - Added Reviewed-by Geert on MII converter binding
  - Added "power-domains" to switch bindings and to switch description
  - Use new compatible "renesas,rzn1-gmac" for GMAC2
  - Describe all switch ports in ethernet switch node
  - Add phy-mode = "internal" to cpu port
- PCS:
  - use phy_interface_mode_is_rgmii() instead of open coded check
  - Add device_link_add() call in miic_create()
- Switch:
  - Fix missing of_node_put(port) in case of loop break.
  - Fix comment alignment for statistics defines
  - Move lk_lock mutex locking outside of the fdb_dump loop

Changes in V5:
- MAINTAINERS:
  - Add Florian Fainelli Reviewed-by
- Switch:
  - Switch Lookup table lock to a mutex instead of a spinlock
  - Only handle "ethernet-ports" property for switch ports
  - Handle RGMII_ID/RXID/TXID
  - Add check for pdata to be non null in remove
  - Add missing of_node_put() for mdio and ports
  - Applied Florian Fainelli patch which makes stats description
    shorter
  - Add Kconfig dependency on ARCH_RZN1 to avoid Kconfig "unmet direct
    dependency"
- PCS:
  - Handle RGMII_ID/RXID/TXID
  - Use value instead of BIT() for speed/mode
- Tag driver:
  - Add Florian Fainelli Reviewed-by

Changes in V4:
- Add ETH_P_DSA_A5PSW in uapi/linux/if_ether.h
- PCS:
  - Use devm_pm_runtime_enable() instead of pm_runtime_enable()
- Switch:
  - Return -EOPNOTSUPP and set extack when multiple bridges are created
  - Remove error messages in fdb_del if entry does not exists
  - Add compatibility with "ethernet-ports" device-tree property
- Tag driver:
  - Use ETH_ZLEN as padding len

Changes in V3:
- PCS:
  - Fixed reverse christmas tree declaration
  - Remove spurious pr_err
  - Use pm_runtime functions
- Tag driver:
  - Remove packed attribute from the tag struct
- Switch:
  - Fix missing spin_unlock in fdb_dump in case of error
  - Add static qualifier to dsa_switch_ops
  - Add missing documentation for hclk and clk members of struct a5psw
  - Changed types of fdb_entry to u16 to discard GCC note on char
    packed bitfields and add reserved field
- Added Reviewed-by tag from Florian Fainelli

Changes in V2:
- PCS:
  - Fix Reverse Christmas tree declaration
  - Removed stray newline
  - Add PCS remove function and disable clocks in them
  - Fix miic_validate function to return correct values
  - Split PCS CONV_MODE definition
  - Reordered phylink_pcs_ops in definition order
  - Remove interface setting in miic_link_up
  - Remove useless checks for invalid interface/speed and error prints
  - Replace phylink_pcs_to_miic_port macro by a static function
  - Add comment in miic_probe about platform_set_drvdata
- Bindings:
 - Fix wrong path for mdio.yaml $ref
 - Fix yamllint errors
- Tag driver:
  - Squashed commit that added tag value with tag driver
  - Add BUILD_BUG_ON for tag size
  - Split control_data2 in 2 16bits values
- Switch:
  - Use .phylink_get_caps instead of .phylink_validate and fill
    supported_interface correctly
  - Use fixed size (ETH_GSTRING_LEN) string for stats and use memcpy
  - Remove stats access locking since RTNL lock is used in upper layers
  - Check for non C45 addresses in mdio_read/write and return
    -EOPNOTSUPP
  - Add get_eth_mac_stats, get_eth_mac_ctrl_stat, get_rmon_stats
  - Fix a few indentation problems
  - Remove reset callback from MDIO bus operation
  - Add phy/mac/rmon stats
- Add get_rmon_stat to dsa_ops

Clément Léger (16):
  net: dsa: allow port_bridge_join() to override extack message
  net: dsa: add support for ethtool get_rmon_stats()
  net: dsa: add Renesas RZ/N1 switch tag driver
  dt-bindings: net: pcs: add bindings for Renesas RZ/N1 MII converter
  net: pcs: add Renesas MII converter driver
  dt-bindings: net: dsa: add bindings for Renesas RZ/N1 Advanced 5 port
    switch
  net: dsa: rzn1-a5psw: add Renesas RZ/N1 advanced 5 port switch driver
  net: dsa: rzn1-a5psw: add statistics support
  net: dsa: rzn1-a5psw: add FDB support
  dt-bindings: net: snps,dwmac: add "power-domains" property
  dt-bindings: net: snps,dwmac: add "renesas,rzn1" compatible
  ARM: dts: r9a06g032: describe MII converter
  ARM: dts: r9a06g032: describe GMAC2
  ARM: dts: r9a06g032: describe switch
  ARM: dts: r9a06g032-rzn1d400-db: add switch description
  MAINTAINERS: add Renesas RZ/N1 switch related driver entry

 .../bindings/net/dsa/renesas,rzn1-a5psw.yaml  |  134 +++
 .../bindings/net/pcs/renesas,rzn1-miic.yaml   |  171 +++
 .../devicetree/bindings/net/snps,dwmac.yaml   |    5 +
 MAINTAINERS                                   |   13 +
 arch/arm/boot/dts/r9a06g032-rzn1d400-db.dts   |  117 ++
 arch/arm/boot/dts/r9a06g032.dtsi              |  108 ++
 drivers/net/dsa/Kconfig                       |    9 +
 drivers/net/dsa/Makefile                      |    1 +
 drivers/net/dsa/rzn1_a5psw.c                  | 1062 +++++++++++++++++
 drivers/net/dsa/rzn1_a5psw.h                  |  259 ++++
 drivers/net/pcs/Kconfig                       |    8 +
 drivers/net/pcs/Makefile                      |    1 +
 drivers/net/pcs/pcs-rzn1-miic.c               |  520 ++++++++
 include/dt-bindings/net/pcs-rzn1-miic.h       |   33 +
 include/linux/pcs-rzn1-miic.h                 |   18 +
 include/net/dsa.h                             |    5 +
 include/uapi/linux/if_ether.h                 |    1 +
 net/dsa/Kconfig                               |    7 +
 net/dsa/Makefile                              |    1 +
 net/dsa/slave.c                               |   18 +-
 net/dsa/tag_rzn1_a5psw.c                      |  113 ++
 21 files changed, 2602 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/net/dsa/renesas,rzn1-a5psw.yaml
 create mode 100644 Documentation/devicetree/bindings/net/pcs/renesas,rzn1-miic.yaml
 create mode 100644 drivers/net/dsa/rzn1_a5psw.c
 create mode 100644 drivers/net/dsa/rzn1_a5psw.h
 create mode 100644 drivers/net/pcs/pcs-rzn1-miic.c
 create mode 100644 include/dt-bindings/net/pcs-rzn1-miic.h
 create mode 100644 include/linux/pcs-rzn1-miic.h
 create mode 100644 net/dsa/tag_rzn1_a5psw.c

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2.36.1