linux-kernel - [PATCH v2 1/5] dt-bindings: connector: extend ports property to model power connections

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Message-Id: <20250507-batt_ops-v2-1-8d06130bffe6@google.com>
Date: Wed, 07 May 2025 18:00:22 -0700
From: Amit Sunil Dhamne via B4 Relay <devnull+amitsd.google.com@...nel.org>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Badhri Jagan Sridharan <badhri@...gle.com>, 
 Sebastian Reichel <sre@...nel.org>, 
 Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <len.brown@...el.com>, 
 Pavel Machek <pavel@...nel.org>
Cc: Kyle Tso <kyletso@...gle.com>, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, 
 linux-pm@...r.kernel.org, Amit Sunil Dhamne <amitsd@...gle.com>
Subject: [PATCH v2 1/5] dt-bindings: connector: extend ports property to
 model power connections

From: Amit Sunil Dhamne <amitsd@...gle.com>

Extend ports property to model power lines going between connector to
charger or battery/batteries. As an example, connector VBUS can supply
power in & out of the battery for a DRP.

Additionally, add ports property to maxim,max33359 controller example.

Signed-off-by: Amit Sunil Dhamne <amitsd@...gle.com>
---
 .../bindings/connector/usb-connector.yaml          | 20 +++++++++++------
 .../devicetree/bindings/usb/maxim,max33359.yaml    | 25 ++++++++++++++++++++++
 2 files changed, 38 insertions(+), 7 deletions(-)

diff --git a/Documentation/devicetree/bindings/connector/usb-connector.yaml b/Documentation/devicetree/bindings/connector/usb-connector.yaml
index 11e40d225b9f3a0d0aeea7bf764f1c00a719d615..706094f890026d324e6ece8b0c1e831d04d51eb7 100644
--- a/Documentation/devicetree/bindings/connector/usb-connector.yaml
+++ b/Documentation/devicetree/bindings/connector/usb-connector.yaml
@@ -181,16 +181,16 @@ properties:
 
   port:
     $ref: /schemas/graph.yaml#/properties/port
-    description: OF graph bindings modeling a data bus to the connector, e.g.
-      there is a single High Speed (HS) port present in this connector. If there
-      is more than one bus (several port, with 'reg' property), they can be grouped
-      under 'ports'.
+    description: OF graph binding to model a logical connection between a device
+      and connector. This connection may represent a data bus or power line. For
+      e.g. a High Speed (HS) data port present in this connector or VBUS line.
+      If there is more than one connection (several port, with 'reg' property),
+      they can be grouped under 'ports'.
 
   ports:
     $ref: /schemas/graph.yaml#/properties/ports
-    description: OF graph bindings modeling any data bus to the connector
-      unless the bus is between parent node and the connector. Since a single
-      connector can have multiple data buses every bus has an assigned OF graph
+    description: OF graph bindings to model multiple "port". Since a connector
+      may have multiple logical connections each one has an assigned OF graph
       port number as described below.
 
     properties:
@@ -207,6 +207,12 @@ properties:
         description: Sideband Use (SBU), present in USB-C. This describes the
           alternate mode connection of which SBU is a part.
 
+      port@3:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: VBUS/VCHGIN present in USB-C connector to model power line
+          going in and/or out of the charger/battery. If there are multiple
+          batteries then this port should contain those many endpoints.
+
     required:
       - port@0
 
diff --git a/Documentation/devicetree/bindings/usb/maxim,max33359.yaml b/Documentation/devicetree/bindings/usb/maxim,max33359.yaml
index 3de4dc40b79192b60443421b557bd2fb18683bf7..730d5c1cc9ddf1ddeff055c00ee172745297633d 100644
--- a/Documentation/devicetree/bindings/usb/maxim,max33359.yaml
+++ b/Documentation/devicetree/bindings/usb/maxim,max33359.yaml
@@ -75,6 +75,31 @@ examples:
                                        PDO_FIXED(9000, 2000, 0)>;
                 sink-bc12-completion-time-ms = <500>;
                 pd-revision = /bits/ 8 <0x03 0x01 0x01 0x08>;
+                ports {
+                    #address-cells = <1>;
+                    #size-cells = <0>;
+
+                    port@0 {
+                        reg = <0>;
+                        usbc0_orien_sw: endpoint {
+                            remote-endpoint = <&usbdrd31_phy_orien_switch>;
+                        };
+                    };
+
+                    port@1 {
+                        reg = <1>;
+                        usbc0_role_sw: endpoint {
+                            remote-endpoint = <&usbdrd31_dwc3_role_switch>;
+                        };
+                    };
+
+                    port@3 {
+                        reg = <3>;
+                        vbus_batt: endpoint {
+                            remote-endpoint = <&max17201_fg>;
+                        };
+                    };
+                };
             };
         };
     };

-- 
2.49.0.987.g0cc8ee98dc-goog