linux-kernel - [PATCH v4 1/2] dt-bindings: usb: ti,hd3ss3220: Add support for VBUS based on ID state

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Message-Id: <20251025122854.1163275-2-krishna.kurapati@oss.qualcomm.com>
Date: Sat, 25 Oct 2025 17:58:53 +0530
From: Krishna Kurapati <krishna.kurapati@....qualcomm.com>
To: 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>,
        Biju Das <biju.das.jz@...renesas.com>,
        Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Krishna Kurapati <krishna.kurapati@....qualcomm.com>
Subject: [PATCH v4 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 | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/ti,hd3ss3220.yaml b/Documentation/devicetree/bindings/usb/ti,hd3ss3220.yaml
index bec1c8047bc0..7ad79aa61efe 100644
--- a/Documentation/devicetree/bindings/usb/ti,hd3ss3220.yaml
+++ b/Documentation/devicetree/bindings/usb/ti,hd3ss3220.yaml
@@ -25,6 +25,15 @@ 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
+
   ports:
     $ref: /schemas/graph.yaml#/properties/ports
     description: OF graph bindings (specified in bindings/graph.txt) that model
-- 
2.34.1