linux-kernel - [PATCH v3 1/4] dt-bindings: usb: Introduce usb-hub.yaml

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Message-ID: <20250422082957.2058229-2-treapking@chromium.org>
Date: Tue, 22 Apr 2025 16:28:27 +0800
From: Pin-yen Lin <treapking@...omium.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Matthias Kaehlcke <mka@...omium.org>
Cc: devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Pin-yen Lin <treapking@...omium.org>,
	Stephen Boyd <swboyd@...omium.org>,
	linux-usb@...r.kernel.org
Subject: [PATCH v3 1/4] dt-bindings: usb: Introduce usb-hub.yaml

Introduce a general USB hub binding that describes downstream ports
and hard wired USB devices for on-board USB hubs.

Signed-off-by: Pin-yen Lin <treapking@...omium.org>

---

Changes in v3:
- Remove redundant schemas

Changes in v2:
- New in v2

 .../devicetree/bindings/usb/usb-hub.yaml      | 84 +++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/usb-hub.yaml

diff --git a/Documentation/devicetree/bindings/usb/usb-hub.yaml b/Documentation/devicetree/bindings/usb/usb-hub.yaml
new file mode 100644
index 00000000000000..5238ab10576308
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/usb-hub.yaml
@@ -0,0 +1,84 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/usb-hub.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Generic USB Hub
+
+maintainers:
+  - Pin-yen Lin <treapking@...omium.org>
+
+allOf:
+  - $ref: usb-device.yaml#
+
+properties:
+  '#address-cells':
+    const: 1
+
+  peer-hub:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      phandle to the peer hub on the controller.
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+    description:
+      The downstream facing USB ports
+
+    patternProperties:
+      "^port@[1-9a-f][0-9a-f]*$":
+        $ref: /schemas/graph.yaml#/properties/port
+
+patternProperties:
+  '^.*@[1-9a-f][0-9a-f]*$':
+    description: The hard wired USB devices
+    type: object
+    $ref: /schemas/usb/usb-device.yaml
+    additionalProperties: true
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: true
+
+examples:
+  - |
+    usb {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        /* 2.0 hub on port 1 */
+        hub_2_0: hub@1 {
+            compatible = "usb123,4567";
+            reg = <1>;
+            peer-hub = <&hub_3_0>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+            /* USB 2.0 device on port 5 */
+            device@5 {
+                reg = <5>;
+                compatible = "usb765,4321";
+            };
+        };
+
+        /* 3.0 hub on port 2 */
+        hub_3_0: hub@2 {
+            compatible = "usb123,abcd";
+            reg = <2>;
+            peer-hub = <&hub_2_0>;
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+                /* Type-A connector on port 3 */
+                port@3 {
+                    reg = <3>;
+                    endpoint {
+                        remote-endpoint = <&usb_a0_ss>;
+                    };
+                };
+            };
+        };
+    };
-- 
2.49.0.805.g082f7c87e0-goog