Re: [PATCH v4 2/3] dt-bindings: usb: snps,dwc3: Add runtime-suspend-on-usb-suspend property

[Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>]

On 14/08/2023 20:50, 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@quicinc.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..e19a60d06d2b 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,runtime-suspend-on-usb-suspend:
> +    description:
> +      If True then dwc3 runtime suspend is allowed during bus suspend
> +      case even with the USB cable connected.

This was no tested... but anyway, this is no a DT property but OS
policy. There is no such thing as "runtime suspend" in the hardware,
because you describe one particular OS.

Sorry, no a DT property, drop the change entirely.


Best regards,
Krzysztof