[PATCH v2] dt-bindings: usb: Document the Microchip USB2514 hub

[Fabio Estevam <festevam@xxxxxxxxx>]

From: Fabio Estevam <festevam@xxxxxxx>

Document the Microchip USB2412, USB2417, and USB2514 USB hubs.

The existing usb251xb.yaml describes Microchip USB251x hubs that are
connected under I2C bus. Here, the hub is under the USB bus and use
the on-board-hub interface instead.

Signed-off-by: Fabio Estevam <festevam@xxxxxxx>
---
Changes since v1:
- Improve commit log to explain why usb251xb.yaml cannot be reused.
- Keep the compatible entries sorted.
- Pass maxItems to clocks.
- Use unevaluatedProperties: false after passing $ref: usb-hcd.yaml#.
- Drop dr_mode = "host".
- Fix example dts indentation.
- Improve the example by adding a USB Ethernet device connected
to the hub. Such example can be found at:
arch/arm64/boot/dts/freescale/imx8mm-kontron-bl-osm-s.dts
arch/arm/boot/dts/broadcom/bcm283x-rpi-lan7515.dtsi

 .../bindings/usb/microchip,usb2514.yaml       | 63 +++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/microchip,usb2514.yaml

diff --git a/Documentation/devicetree/bindings/usb/microchip,usb2514.yaml b/Documentation/devicetree/bindings/usb/microchip,usb2514.yaml
new file mode 100644
index 000000000000..783c27591e56
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/microchip,usb2514.yaml
@@ -0,0 +1,63 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/microchip,usb2514.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip USB2514 Hub Controller
+
+maintainers:
+  - Fabio Estevam <festevam@xxxxxxxxx>
+
+allOf:
+  - $ref: usb-hcd.yaml#
+
+properties:
+  compatible:
+    enum:
+      - usb424,2412
+      - usb424,2417
+      - usb424,2514
+
+  reg: true
+
+  reset-gpios:
+    description: GPIO connected to the RESET_N pin.
+
+  vdd-supply:
+    description: 3.3V power supply.
+
+  clocks:
+    description: External 24MHz clock connected to the CLKIN pin.
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/imx6qdl-clock.h>
+    #include <dt-bindings/gpio/gpio.h>
+
+    usb {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        usb-hub@1 {
+            compatible = "usb424,2514";
+            reg = <1>;
+            clocks = <&clks IMX6QDL_CLK_CKO>;
+            reset-gpios = <&gpio7 12 GPIO_ACTIVE_LOW>;
+            vdd-supply = <&reg_3v3_hub>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            ethernet@1 {
+                compatible = "usbb95,772b";
+                reg = <1>;
+            };
+        };
+    };
-- 
2.34.1