Add EcoNet EN751221 and EN7528 PCIe PHY support.

Re-sending rebased v2 because there have been no comments since March 12.

Changes from v1:
* Rebased on 2febe6e6ee6e34c7754eff3c4d81aa7b0dcb7979
* v1: https://lore.kernel.org/linux-mips/20260312164432.569566-1-cjd@cjdns.fr/

This is split from a larger PCIe patchset which crossed multiple
subsystems. I'm not labeling this a v3 because it's a new patchset, but
I'm keeping the historical record anyway.

Changes from econet-pcie v2: none relevant to this patch set
* econet-pcie v2: https://lore.kernel.org/linux-mips/20260309131818.74467-1-cjd@cjdns.fr

Changes from econet-pcie v1:
* econet,en751221-pcie-phy.yaml Refer to PHYs as "gen1" and "gen2"
* econet-pcie v1: https://lore.kernel.org/linux-mips/20260303190948.694783-1-cjd@cjdns.fr/

Caleb James DeLisle (2):
  dt-bindings: phy: Document PCIe PHY in EcoNet EN751221 and EN7528
  phy: econet: Add PCIe PHY driver for EcoNet EN751221 and EN7528 SoCs.

 .../phy/econet,en751221-pcie-phy.yaml         |  50 +++++
 MAINTAINERS                                   |   7 +
 drivers/phy/Kconfig                           |  12 ++
 drivers/phy/Makefile                          |   1 +
 drivers/phy/phy-econet-pcie.c                 | 180 ++++++++++++++++++
 5 files changed, 250 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/econet,en751221-pcie-phy.yaml
 create mode 100644 drivers/phy/phy-econet-pcie.c

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2.39.5