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. + additionalProperties: true ... -- 2.37.1
