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

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Message-ID:
 <TY3PR01MB11346C11E93AF51BDBD964BF986FCA@TY3PR01MB11346.jpnprd01.prod.outlook.com>
Date: Mon, 27 Oct 2025 08:44:49 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Krishna Kurapati PSSNV <krishna.kurapati@....qualcomm.com>
CC: "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>, Greg
 Kroah-Hartman <gregkh@...uxfoundation.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>, Dmitry Baryshkov
	<dmitry.baryshkov@....qualcomm.com>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v5 1/2] dt-bindings: usb: ti,hd3ss3220: Add support for
 VBUS based on ID state



> -----Original Message-----
> From: Krishna Kurapati PSSNV <krishna.kurapati@....qualcomm.com>
> Sent: 27 October 2025 08:32
> To: Biju Das <biju.das.jz@...renesas.com>
> Cc: linux-usb@...r.kernel.org; Greg Kroah-Hartman <gregkh@...uxfoundation.org>; Rob Herring
> <robh@...nel.org>; Krzysztof Kozlowski <krzk+dt@...nel.org>; Conor Dooley <conor+dt@...nel.org>;
> Heikki Krogerus <heikki.krogerus@...ux.intel.com>; Dmitry Baryshkov
> <dmitry.baryshkov@....qualcomm.com>; devicetree@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v5 1/2] dt-bindings: usb: ti,hd3ss3220: Add support for VBUS based on ID state
> 
> 
> 
> On 10/27/2025 1:02 PM, Biju Das wrote:
> >
> >
> >> -----Original Message-----
> >> From: Krishna Kurapati <krishna.kurapati@....qualcomm.com>
> >> Sent: 27 October 2025 07:28
> > .kernel.org; linux-kernel@...r.kernel.org; Krishna
> >> Kurapati <krishna.kurapati@....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@....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??
> >
> Hi Biju,
> 
>   Adding GPIO to dt is a generic thing. Also this is an optional proprety. Can we skip adding an
> example.

OK for me. Just thought that example will cover regulator usage as well for DT user.

Cheers,
Biju