From: Vitor Soares <vitor.soares@toradex.com>

Some PCIe endpoints or slots connected to the TI J721E PCIe root complex
may require external voltage regulators to provide 1.5V, 3.3V, or 12V
supplies. These regulators depend on the specific board design — for
example, M.2 or miniPCIe connectors often need 3.3V or 1.5V, while
full-size PCIe slots may also require 12V.

This series adds bindings and driver support for these optional regulators.
When present, the driver enables them automatically using
devm_regulator_get_enable_optional(), ensuring proper cleanup on removal.

Tested on a Toradex Aquila AM69 platform with a Wi-Fi PCIe endpoint
requiring 3.3V.

These changes are based on upstream discussion:
https://lore.kernel.org/linux-pci/20231105092908.3792-1-wsa+renesas@sang-engineering.com/

Vitor Soares (2):
  dt-bindings: PCI: ti,j721e-pci-host: Add optional regulator supplies
  PCI: j721e: Add support for optional regulator supplies

 .../devicetree/bindings/pci/ti,j721e-pci-host.yaml | 14 ++++++++++++++
 drivers/pci/controller/cadence/pci-j721e.c         | 13 +++++++++++++
 2 files changed, 27 insertions(+)

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2.51.0