On Tue, Aug 19, 2025 at 03:16:29PM GMT, Richard Zhu wrote: > Refer to PCIe CEM r6.0, sec 2.3 WAKE# Signal, 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, add the vaux and keep it enabled to power up WAKE# > circuit for the entire PCIe controller lifecycle when WAKE# is supported. > > Signed-off-by: Richard Zhu <hongxing.zhu@xxxxxxx> > --- > .../devicetree/bindings/pci/snps,dw-pcie-common.yaml | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml b/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml > index 34594972d8dbe..5283f51388584 100644 > --- a/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml > +++ b/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml > @@ -262,6 +262,12 @@ properties: > > dma-coherent: true > > + vaux-supply: > + description: Should specify the regulator in charge of power source > + of the WAKE# generation on the PCIe connector. When the WAKE# is > + enabled, this regualor would be always on and used to power up > + WAKE# circuit. 3.3Vaux supply is already documented in the dtschema: https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/pci/pci-bus-common.yaml#L179 So you should use that instead. - Mani -- மணிவண்ணன் சதாசிவம்
