dt-bindings: usb: Add binding for the TI wrapper for Cadence USB3 controller

TI platforms have a wrapper module around the Cadence USB3
controller. Add binding information for that.
Signed-off-by: Roger Quadros <rogerq@ti.com>
Cc: Rob Herring <robh@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Documentation/devicetree/bindings/usb/ti,j721e-usb.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/usb/ti,j721e-usb.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Bindings for the TI wrapper module for the Cadence USBSS-DRD controller
+
+maintainers:
+  - Roger Quadros <rogerq@ti.com>
+
+properties:
+  compatible:
+    items:
+      - const: ti,j721e-usb
+
+  reg:
+    description: module registers
+
+  power-domains:
+    description:
+       PM domain provider node and an args specifier containing
+       the USB device id value. See,
+       Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt
+
+  clocks:
+    description: Clock phandles to usb2_refclk and lpm_clk
+    minItems: 2
+    maxItems: 2
+
+  clock-names:
+    items:
+      - const: ref
+      - const: lpm
+
+  ti,usb2-only:
+    description:
+      If present, it restricts the controller to USB2.0 mode of
+      operation. Must be present if USB3 PHY is not available
+      for USB.
+    type: boolean
+
+  ti,vbus-divider:
+    description:
+      Should be present if USB VBUS line is connected to the
+      VBUS pin of the SoC via a 1/3 voltage divider.
+    type: boolean
+
+required:
+  - compatible
+  - reg
+  - power-domains
+  - clocks
+  - clock-names
+
+examples:
+  - |
+    #include <dt-bindings/soc/ti,sci_pm_domain.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    cdns_usb@4104000 {
+          compatible = "ti,j721e-usb";
+          reg = <0x00 0x4104000 0x00 0x100>;
+          power-domains = <&k3_pds 288 TI_SCI_PD_EXCLUSIVE>;
+          clocks = <&k3_clks 288 15>, <&k3_clks 288 3>;
+          clock-names = "ref", "lpm";
+          assigned-clocks = <&k3_clks 288 15>;	/* USB2_REFCLK */
+          assigned-clock-parents = <&k3_clks 288 16>; /* HFOSC0 */
+          #address-cells = <2>;
+          #size-cells = <2>;
+
+          usb@6000000 {
+                compatible = "cdns,usb3";
+                reg = <0x00 0x6000000 0x00 0x10000>,
+                      <0x00 0x6010000 0x00 0x10000>,
+                      <0x00 0x6020000 0x00 0x10000>;
+                reg-names = "otg", "xhci", "dev";
+                interrupts = <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>,	/* irq.0 */
+                             <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>,	/* irq.6 */
+                             <GIC_SPI 120 IRQ_TYPE_LEVEL_HIGH>;	/* otgirq.0 */
+                interrupt-names = "host",
+                                  "peripheral",
+                                  "otg";
+                maximum-speed = "super-speed";
+                dr_mode = "otg";
+        };
+    };