[PATCH 1/3] dt-bindings: usb: Add binding for TI USB8041 hub controller

[Alexander Stein <alexander.stein@ew.tq-group.com>]

The TI USB8041 is a USB 3.0 hub controller with 4 ports.

This initial version of the binding only describes USB related aspects
of the USB8041, it does not cover the option of connecting the controller
as an i2c slave.

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
---
Well, this is essentially a ripoff of
Documentation/devicetree/bindings/usb/realtek,rts5411.yaml with USB IDs
replaced, reset-gpio added and example adjusted.
IMHO this should be merged together with realtek,rts5411.yaml. Is it ok
to rename bindings files? I guess a common onboard-usb-hub.yaml matching
the driver seens reasonable. Any recommendations how to proceed?

 .../devicetree/bindings/usb/ti,usb8041.yaml   | 69 +++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/ti,usb8041.yaml

diff --git a/Documentation/devicetree/bindings/usb/ti,usb8041.yaml b/Documentation/devicetree/bindings/usb/ti,usb8041.yaml
new file mode 100644
index 000000000000..9a49d60527b1
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/ti,usb8041.yaml
@@ -0,0 +1,69 @@
+# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/ti,usb8041.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Binding for the TI USB8041 USB 3.0 hub controller
+
+maintainers:
+  - Matthias Kaehlcke <mka@chromium.org>
+
+allOf:
+  - $ref: usb-device.yaml#
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - usb451,8140
+          - usb451,8142
+
+  reg: true
+
+  reset-gpio:
+    maxItems: 1
+    description:
+      GPIO specifier for GSRT# pin.
+
+  vdd-supply:
+    description:
+      phandle to the regulator that provides power to the hub.
+
+  peer-hub:
+    $ref: '/schemas/types.yaml#/definitions/phandle'
+    description:
+      phandle to the peer hub on the controller.
+
+required:
+  - peer-hub
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    usb {
+        dr_mode = "host";
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        /* 2.0 hub on port 1 */
+        hub_2_0: hub@1 {
+          compatible = "usb451,8142";
+          reg = <1>;
+          peer-hub = <&hub_3_0>;
+          reset-gpio = <&gpio1 11 GPIO_ACTIVE_LOW>;
+        };
+
+        /* 3.0 hub on port 2 */
+        hub_3_0: hub@2 {
+          compatible = "usb451,8140";
+          reg = <2>;
+          peer-hub = <&hub_2_0>;
+          reset-gpio = <&gpio1 11 GPIO_ACTIVE_LOW>;
+        };
+    };
-- 
2.25.1