linux-kernel - [PATCH 1/2] dt-bindings: usb: Add binding for onboard USB hubs

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Message-Id: <20200914112716.1.I248292623d3d0f6a4f0c5bc58478ca3c0062b49a@changeid>
Date:   Mon, 14 Sep 2020 11:27:48 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>
Cc:     Alan Stern <stern@...land.harvard.edu>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Bastien Nocera <hadess@...ess.net>,
        Ravi Chandra Sadineni <ravisadineni@...omium.org>,
        linux-usb@...r.kernel.org, Stephen Boyd <swboyd@...omium.org>,
        devicetree@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Peter Chen <peter.chen@....com>, linux-kernel@...r.kernel.org,
        Matthias Kaehlcke <mka@...omium.org>
Subject: [PATCH 1/2] dt-bindings: usb: Add binding for onboard USB hubs

Onboard USB hubs need to be powered and may require initiaization of
other resources (like GPIOs or clocks) to work properly. This adds
a device tree binding for these hubs.

Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
---

 .../bindings/usb/onboard_usb_hub.yaml         | 70 +++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml

diff --git a/Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml b/Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml
new file mode 100644
index 000000000000..f82d8f459eed
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml
@@ -0,0 +1,70 @@
+# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/onboard_usb_hub.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Binding for onboard USB hubs
+
+maintainers:
+  - Matthias Kaehlcke <mka@...omium.org>
+
+allOf:
+  - $ref: /schemas/usb/onboard_usb_hub.yaml#
+
+properties:
+  compatible:
+    enum:
+      - onboard-usb-hub
+      - realtek,rts5411
+
+  power-off-in-suspend:
+    description:
+      The hub should be powered off during system suspend. When the
+      "wakeup-source" property is also provided the hub is only powered
+      off during suspend when no wakeup capable descendants are connected.
+    type: boolean
+
+  vdd-supply:
+    description:
+      phandle to the regulator that provides power to the hub.
+
+  wakeup-source:
+    description:
+      Wakeup capable USB devices connected to this hub can be used as
+      wakeup source.
+    type: boolean
+
+required:
+  - compatible
+  - vdd-supply
+
+examples:
+  - |
+    usb_hub: usb-hub {
+        compatible = "realtek,rts5411", "onboard-usb-hub";
+        vdd-supply = <&pp3300_hub>;
+        power-off-in-suspend;
+        wakeup-source;
+    };
+
+    &usb_1_dwc3 {
+	dr_mode = "host";
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	/* 2.0 hub on port 1 */
+	hub@1 {
+		compatible = "usbbda,5411";
+		reg = <1>;
+		hub = <&usb_hub>;
+	};
+
+	/* 3.0 hub on port 2 */
+	hub@2 {
+		compatible = "usbbda,411";
+		reg = <2>;
+		hub = <&usb_hub>;
+	};
+
+...
-- 
2.28.0.618.gf4bc123cb7-goog