linux-kernel - Re: [PATCH v3 2/3] dt-bindings: usb: snps,dwc3: Add allow-rtsusp-on-u3 property

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Date:   Tue, 11 Jul 2023 21:56:48 +0000
From:   Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To:     Elson Roy Serrao <quic_eserrao@...cinc.com>
CC:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        "stern@...land.harvard.edu" <stern@...land.harvard.edu>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "rogerq@...nel.org" <rogerq@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "quic_wcheng@...cinc.com" <quic_wcheng@...cinc.com>,
        "quic_jackp@...cinc.com" <quic_jackp@...cinc.com>
Subject: Re: [PATCH v3 2/3] dt-bindings: usb: snps,dwc3: Add
 allow-rtsusp-on-u3 property

On Tue, Jul 11, 2023, Elson Roy Serrao wrote:
> This property allows dwc3 runtime suspend when bus suspend interrupt
> is received even with cable connected. This would allow the dwc3
> controller to enter low power mode during bus suspend scenario.
> 
> This property would particularly benefit dwc3 IPs where hibernation is
> not enabled and the dwc3 low power mode entry/exit is handled by the
> glue driver. The assumption here is that the platform using this dt
> property is capable of detecting resume events to bring the controller
> out of suspend.
> 
> Signed-off-by: Elson Roy Serrao <quic_eserrao@...cinc.com>
> ---
>  Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> index a696f23730d3..18ad99a26dd9 100644
> --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> @@ -403,6 +403,11 @@ properties:
>      description:
>        Enable USB remote wakeup.
>  
> +  snps,allow-rtsusp-on-u3:

Please spell out the whole thing as "rtsusp" isn't clear. Also, it's not
just for U3 right? For highspeed, it's L2.

How about the name that Roger use: "snps,gadget-keep-connect-sys-sleep"

> +    description:
> +      If True then dwc3 runtime suspend is allowed during bus suspend
> +      case even with the USB cable connected.
> +
>  unevaluatedProperties: false
>  
>  required:
> -- 
> 2.17.1
> 

Did you Cc Rob, the devicetree maintainer?

Thanks,
Thinh