linux-kernel - Re: [PATCH v3 1/2] dt-bindings: PCI: fsl,imx6q-pcie: Add vaux for i.MX PCIe

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Message-ID: <aJ4yuo6bULFy7uAv@lizhi-Precision-Tower-5810>
Date: Thu, 14 Aug 2025 15:02:18 -0400
From: Frank Li <Frank.li@....com>
To: Richard Zhu <hongxing.zhu@....com>
Cc: l.stach@...gutronix.de, lpieralisi@...nel.org, kwilczynski@...nel.org,
	mani@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, bhelgaas@...gle.com, shawnguo@...nel.org,
	s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
	linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, imx@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: PCI: fsl,imx6q-pcie: Add vaux for
 i.MX PCIe

On Thu, Aug 14, 2025 at 04:59:19PM +0800, 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.

if it is standard, it should move to snps,dw-pcie-common.yaml.

Frank
>
> Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> ---
>  .../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
>