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/fsl,imx6q-pcie-common.yaml | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie-common.yaml b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie-common.yaml
index cddbe21f99f2b..13fddf731ab8c 100644
--- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie-common.yaml
+++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie-common.yaml
@@ -98,6 +98,12 @@ properties:
phy-names:
const: pcie-phy
+ 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 (optional required).
+
vpcie-supply:
description: Should specify the regulator in charge of PCIe port power.
The regulator will be enabled when initializing the PCIe host and
--
2.37.1
