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

Biju Das
2025-10-27T07:32:15Z

> -----Original Message-----
> From: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
> Sent: 27 October 2025 07:28
.kernel.org; linux-kernel@vger.kernel.org; Krishna
> Kurapati <krishna.kurapati@oss.qualcomm.com>
> 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@oss.qualcomm.com>
> ---
> 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