linux-kernel - [PATCH v1 1/3] dt-bindings: connector: Add time property for Sink BC12 detection completion

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Message-ID: <20241031235957.1261244-2-amitsd@google.com>
Date: Thu, 31 Oct 2024 16:59:52 -0700
From: Amit Sunil Dhamne <amitsd@...gle.com>
To: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org, 
	gregkh@...uxfoundation.org, heikki.krogerus@...ux.intel.com
Cc: dmitry.baryshkov@...aro.org, kyletso@...gle.com, rdbabiera@...gle.com, 
	badhri@...gle.com, linux@...ck-us.net, xu.yang_2@....com, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-usb@...r.kernel.org, Amit Sunil Dhamne <amitsd@...gle.com>
Subject: [PATCH v1 1/3] dt-bindings: connector: Add time property for Sink
 BC12 detection completion

This commit adds a new time property for Battery charger (BC1.2) type
detection completion process (based on BCv1.2 detection spec) when
typec port connects in a potential sink role. BC1.2 detection is used
by some Type C port controllers implementations (such as
"maxim,max33359") to detect the type of charger port.

Signed-off-by: Amit Sunil Dhamne <amitsd@...gle.com>
---
 .../devicetree/bindings/connector/usb-connector.yaml  | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/devicetree/bindings/connector/usb-connector.yaml b/Documentation/devicetree/bindings/connector/usb-connector.yaml
index 21a0c58c65cd..67700440e23b 100644
--- a/Documentation/devicetree/bindings/connector/usb-connector.yaml
+++ b/Documentation/devicetree/bindings/connector/usb-connector.yaml
@@ -283,6 +283,16 @@ properties:
     maximum: 200
     default: 200
 
+  sink-bc12-completion-time-ms:
+    description: Represents the max time in ms that a port in sink role takes
+      to complete Battery Charger (BC1.2) Detection. BC1.2 detection is a
+      hardware mechanism, which in some TCPC implementations, can run in
+      parallel once the Type-C connection state machine reaches the "potential
+      connect as sink" state. In TCPCs where this causes delays to respond to
+      the incoming PD messages, sink-bc12-completion-time-ms is used to delay
+      PD negotiation till BC1.2 detection completes.
+    default: 0
+
 dependencies:
   sink-vdos-v1: [ sink-vdos ]
   sink-vdos: [ sink-vdos-v1 ]
@@ -426,6 +436,7 @@ examples:
             sink-wait-cap-time-ms = <465>;
             ps-source-off-time-ms = <835>;
             cc-debounce-time-ms = <101>;
+            sink-bc12-completion-time-ms = <500>;
         };
     };
 
-- 
2.47.0.199.ga7371fff76-goog