linux-kernel - Re: [PATCH V2 2/4] dt-bindings: imx6q-pcie: Add wake-gpios property

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Message-ID: <20250404094130.GA35433@francesco-nb>
Date: Fri, 4 Apr 2025 11:41:30 +0200
From: Francesco Dolcini <francesco@...cini.it>
To: Sherry Sun <sherry.sun@....com>
Cc: hongxing.zhu@....com, l.stach@...gutronix.de, lpieralisi@...nel.org,
	kw@...ux.com, robh@...nel.org, bhelgaas@...gle.com,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
	festevam@...il.com, linux-imx@....com, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 2/4] dt-bindings: imx6q-pcie: Add wake-gpios property

Hello

On Wed, Dec 13, 2023 at 05:28:48PM +0800, Sherry Sun wrote:
> Add wake-gpios property that can be used to wakeup the host
> processor.
> 
> Signed-off-by: Sherry Sun <sherry.sun@....com>
> Reviewed-by: Richard Zhu <hongxing.zhu@....com>
> ---
>  Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
> index 81bbb8728f0f..fba757d937e1 100644
> --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
> +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
> @@ -72,6 +72,12 @@ properties:
>        L=operation state) (optional required).
>      type: boolean
>  
> +  wake-gpios:
> +    description: If present this property specifies WAKE# sideband signaling
> +      to implement wakeup functionality. This is an input GPIO pin for the Root
> +      Port mode here. Host drivers will wakeup the host using the IRQ
> +      corresponding to the passed GPIO.
> +

>From what I know it is possible to share the same WAKE# signal for
multiple root ports. Is this going to work fine with this binding? Same
question on the driver.

We do have design exactly like that, so it's not a theoretical question.

Francesco