[PATCH net-next v1 0/5] net: enetc: S32N79 pseudo-MAC (PPM) networking support

[Claudiu Manoil <claudiu.manoil@nxp.com>]

This series adds networking support for the ENETCv4.4 pseudo-MAC (PPM)
ports found on the NXP S32N79 SoC. On S32N79, the ENETCv4 ports are
not wired to any external PHY/MII; instead they are internal "pseudo-MAC"
links into the on-chip NETC switch. These links are proprietary, expose
no standard IEEE interface, and run at a speed fixed at boot time by the
Port PCR[PSPEED] register.

A key use case is a port that has no "ethernet" DT node at all: NETC is
reached over PCI from a host that probes the ENETC, while the internal
NETC switch it connects to is not owned by Linux. Such a port must have
its fixed link synthesized at probe time.

Rather than hand-building a software node, the driver describes the
fixed link with a self-contained DT overlay (following the lan966x PCI
approach), applied unmodified via of_overlay_fdt_apply() onto the PCI
function's dynamic OF node (CONFIG_PCI_DYNAMIC_OF_NODES). phylink then
picks up the fixed-link node through dev_fwnode(); the real operating
speed is sourced live from PCR[PSPEED].

The series touches three subsystems:
  - net/enetc:  pseudo-MAC overlay support + probing of 4.4 devices
  - arm64 dts:  NETC IEP18 ECAM node on S32N79 and its RDB board enable
  - PCI:        a quirk creating the OF node for the ENETC PMAC functions

Because this is primarily a networking feature and the pieces are
interdependent at runtime, it would be most convenient to merge the
whole series through the netdev tree.

Patch 1 has a runtime (not Kconfig) dependency on
CONFIG_PCI_DYNAMIC_OF_NODES; absent that, the pseudo-MAC probe path
fails gracefully with -ENODEV.

v1: initial submission.

Claudiu Manoil (5):
  net: enetc: Add pseudo-MAC support for ENETCv4 Ports via a DT overlay
  net: enetc: Enable probing of version 4.4 devices
  arm64: dts: s32n79: add NETC IEP18 ECAM node for ENETC PPM ports
  arm64: dts: s32n79-rdb: enable NETC IEP18
  PCI: Create OF node for NXP ENETC pseudo-MAC functions

 arch/arm64/boot/dts/freescale/s32n79-rdb.dts  |  4 +
 arch/arm64/boot/dts/freescale/s32n79.dtsi     | 24 +++++
 drivers/net/ethernet/freescale/enetc/Kconfig  |  1 +
 drivers/net/ethernet/freescale/enetc/Makefile |  1 +
 drivers/net/ethernet/freescale/enetc/enetc.c  | 12 +++
 drivers/net/ethernet/freescale/enetc/enetc.h  |  1 +
 .../net/ethernet/freescale/enetc/enetc4_pf.c  | 98 +++++++++++++++++--
 .../freescale/enetc/enetc4_pseudo_mac.dtso    | 32 ++++++
 .../net/ethernet/freescale/enetc/enetc_hw.h   |  1 +
 .../freescale/enetc/enetc_pf_common.c         | 41 +++++++-
 .../freescale/enetc/enetc_pf_common.h         |  1 +
 drivers/pci/quirks.c                          |  2 +
 12 files changed, 209 insertions(+), 9 deletions(-)
 create mode 100644 drivers/net/ethernet/freescale/enetc/enetc4_pseudo_mac.dtso


base-commit: d8674294aefef02266c4d47ad10131f1bffbe534
-- 
2.34.1