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

[Francesco Dolcini <francesco@dolcini.it>]

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@nxp.com>
> Reviewed-by: Richard Zhu <hongxing.zhu@nxp.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