Refer to PCIe CEM r6.0, sec 2.3 WAKE# Singal, WAKE# signal is only asserted by the Add-in Card when all its functions are in D3Cold state and at least one of its functions is enabled for wakeup generation. The 3.3V auxiliary power (+3.3Vaux) must be present and used for wakeup process. Since the main power supply would be gated off to let Add-in Card to be in D3Cold, get the vaux and keep it enabled to power up WAKE# circuit for the entire PCIe controller lifecycle when it's present. v4 changes: Move the dt-binding to snps,dw-pcie-common.yaml. v3 changes: Add a new vaux power supply used to specify the regulator powered up the WAKE# circuit on the connector when WAKE# is supported. v2 changes: Update the commit message, and add reviewed-by from Frank. https://patchwork.kernel.org/project/linux-pci/patch/20250619072438.125921-1-hongxing.zhu@xxxxxxx/ [PATCH v4 1/2] dt-bindings: PCI: dwc: Add vaux regulator [PATCH v4 2/2] PCI: imx6: Enable the vaux regulator when fetch it Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml | 6 ++++++ drivers/pci/controller/dwc/pci-imx6.c | 15 +++++++++++++++ 2 files changed, 21 insertions(+)
