Merge branch 'net-stmmac-eic7700-add-eth1-variant-support-and-update-delay-bindings'

Zhi Li says:

====================
net: stmmac: eic7700: add eth1 variant support and update delay bindings

This series updates Ethernet support for the ESWIN EIC7700 SoC,
including support for the eth1 MAC variant.

The series includes DT binding updates and stmmac glue driver updates
for the EIC7700 Ethernet controller.

The changes include:
  - Update the tx-internal-delay-ps binding property from a fixed enum
    list to a range-based definition, and make it optional with the
    corresponding driver update.

  - Add support for the EIC7700 eth1 MAC variant, which has
    silicon-specific RX sampling behavior and TX timing characteristics.
    A dedicated compatible string is introduced for this hardware variant,
    and the driver applies the required RX clock inversion handling and
    timing adjustments.

Due to silicon characteristics, the eth1 interface has a fixed TX
internal delay of approximately 2 ns and an RX sampling skew of 4-5 ns
that cannot be compensated solely by standard RGMII delay settings.
The binding models the effective TX delay range of this variant, while
the driver handles the required hardware-specific timing configuration.

Only the DT bindings and driver patches are included in this series. The
DTS changes are intentionally omitted for the following reasons:
  - The HSP bus infrastructure is being introduced by Pinkesh Vaghela's
    DT series [0], currently under review.
  - The HSPCRG clock/reset series [1] provides additional infrastructure
    for the HSP subsystem.

Once these dependencies are merged, a follow-up DT series will enable
Ethernet, USB, eMMC, and SD across the HSP bus.

Reference:
  [0] https://lore.kernel.org/lkml/20260706081055.1126275-1-pinkesh.vaghela@einfochips.com/
  [1] https://lore.kernel.org/all/20260605060730.1605-1-dongxuyang@eswincomputing.com/
====================

Link: https://patch.msgid.link/20260707064033.1265-1-lizhi2@eswincomputing.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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