RE: [PATCH v5 1/2] dt-bindings: usb: ti,hd3ss3220: Add support for VBUS based on ID state

[Biju Das]

> -----Original Message-----
> From: Krishna Kurapati <krishna.kurapati@xxxxxxxxxxxxxxxx>
> Sent: 27 October 2025 07:28
.kernel.org; linux-kernel@xxxxxxxxxxxxxxx; Krishna
> Kurapati <krishna.kurapati@xxxxxxxxxxxxxxxx>
> Subject: [PATCH v5 1/2] dt-bindings: usb: ti,hd3ss3220: Add support for VBUS based on ID state
> 
> Update the bindings to support reading ID state and VBUS, as per the
> HD3SS3220 data sheet. The ID pin is kept high if VBUS is not at VSafe0V and asserted low once VBUS is
> at VSafe0V, enforcing the Type-C requirement that VBUS must be at VSafe0V before re-enabling VBUS.
> 
> Add id-gpios property to describe the input gpio for USB ID pin.
> 
> Signed-off-by: Krishna Kurapati <krishna.kurapati@xxxxxxxxxxxxxxxx>
> ---
>  Documentation/devicetree/bindings/usb/ti,hd3ss3220.yaml | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/ti,hd3ss3220.yaml
> b/Documentation/devicetree/bindings/usb/ti,hd3ss3220.yaml
> index bec1c8047bc0..06099e93c6c3 100644
> --- a/Documentation/devicetree/bindings/usb/ti,hd3ss3220.yaml
> +++ b/Documentation/devicetree/bindings/usb/ti,hd3ss3220.yaml
> @@ -25,6 +25,14 @@ properties:
>    interrupts:
>      maxItems: 1
> 
> +  id-gpios:
> +    description:
> +      An input gpio for USB ID pin. Upon detecting a UFP device, HD3SS3220
> +      will keep ID pin high if VBUS is not at VSafe0V. Once VBUS is at VSafe0V,
> +      the HD3SS3220 will assert ID pin low. This is done to enforce Type-C
> +      requirement that VBUS must be at VSafe0V before re-enabling VBUS.
> +    maxItems: 1
> +

Maybe to help DT users, add an example for this use case??

Cheers,
Biju

>    ports:
>      $ref: /schemas/graph.yaml#/properties/ports
>      description: OF graph bindings (specified in bindings/graph.txt) that model
> --
> 2.34.1