Re: [PATCH 1/3] dt-bindings: usb: dwc3: document snps,reinit-phy-on-resume

[Rob Herring <robh@kernel.org>]

On Tue, Jun 02, 2026 at 11:12:34AM +1200, Oliver White wrote:
> Add the documentation for the 'snps,reinit-phy-on-resume' boolean
> property. When set, the DWC3 core will perform a full phy_exit() +
> phy_init() cycle on each USB2 PHY during the host-mode fast resume
> path. This is needed on platforms where the USB2 PHY power domain
> is gated during deep sleep even when device_may_wakeup is true.
> 
> Signed-off-by: Oliver White <oliverjwhite07@gmail.com>
> ---
>  .../devicetree/bindings/usb/snps,dwc3-common.yaml      | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3-common.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3-common.yaml
> index 6c0b8b653824..d12f6ae81ab8 100644
> --- a/Documentation/devicetree/bindings/usb/snps,dwc3-common.yaml
> +++ b/Documentation/devicetree/bindings/usb/snps,dwc3-common.yaml
> @@ -212,6 +212,16 @@ properties:
>        When set, run the SOF/ITP counter based on ref_clk.
>      type: boolean
>  
> +  snps,reinit-phy-on-resume:
> +    description:
> +      When set, the DWC3 will re-initialize the USB2 PHYs during the
> +      host-mode fast resume path (device_may_wakeup). Some platforms
> +      cut PHY power during deep sleep even when USB wake is enabled,
> +      and the standard PHY runtime PM resume is insufficient to restore
> +      the PHY register state. This quirk forces a full phy_exit() +
> +      phy_init() cycle on each USB2 PHY.
> +    type: boolean

This should be implied from a platform specific compatible string.

Rob