[PATCH RFC 1/5] dt-bindings: add binding for CDNSP-DRD controller

[Pawel Laszczak <pawell@cadence.com>]

This patch aim at documenting USB related dt-bindings for the
Cadence CDNSP-DRD controller.

Signed-off-by: Pawel Laszczak <pawell@cadence.com>
---
 .../devicetree/bindings/usb/cdns-cdnsp.yaml   | 104 ++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/cdns-cdnsp.yaml

diff --git a/Documentation/devicetree/bindings/usb/cdns-cdnsp.yaml b/Documentation/devicetree/bindings/usb/cdns-cdnsp.yaml
new file mode 100644
index 000000000000..83d353711e31
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/cdns-cdnsp.yaml
@@ -0,0 +1,104 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/usb/cdns-cdnsp.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title:  Device tree binding for Cadence CDNSP (Super Speed Plus) controller
+
+maintainers:
+  - Pawel Laszczak <pawell@cadence.com>
+
+description:
+  The Cadence CDNSP controller support Host, Device and DRD mode.
+  It also supports Full Speed, Hight Speed, Super Speed and
+  Super Speed Plus protocols.
+
+properties:
+  compatible:
+    items:
+      - enum:
+        - cdns,usbssp
+
+  reg:
+    description: Physical base address and size of the
+                 controller's register areas. Controller has
+                 three  different regions.
+    minItems: 2
+    maxItems: 3
+    items:
+      - description: HOST registers area.
+      - description: DEVICE registers area.
+      - description: OTG/DRD registers area.
+
+  reg-names:
+    items:
+      - const: xhci
+      - const: dev
+      - const: otg
+
+  interrupts:
+    minItems: 2
+    maxItems: 3
+    items:
+      - description: Interrupt used by XHCI driver.
+      - description: Interrupt used by device driver.
+      - description: Interrupt used by DRD part of driver.
+
+  interrupt-names:
+    items:
+      - const: host
+      - const: peripheral
+      - const: otg
+
+  maximum-speed:
+    enum:
+      - full-speed
+      - high-speed
+      - super-speed
+      - super-speed-plus
+
+  dr_mode:
+    enum:
+      - host
+      - peripheral
+      - otg
+
+  phys:
+    description:
+      Reference to the USB PHY.
+      Must contain an entry for each entry in phy-names.
+      See ../phy/phy-bindings.txt for details.
+
+  phy-names:
+    items:
+      - const: cdnsp,usb2-phy
+      - const: cdnsp,usb3-phy
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - interrupts
+  - interrupt-names
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    usb_otg: usb@f3000000 {
+      compatible = "cdns,usbssp";
+      reg = <0x00 0x01c13000 0x00 0x0400>,
+            <0x00 0xf3010000 0x00 0x10000>,
+            <0x00 0xf3020000 0x00 0x10000>;
+      reg-names = "xhci", "dev", "otg";
+      interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>,
+                   <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>,
+                   <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>;
+      interrupt-names = "host", "peripheral", "otg";
+      phys = <&usbphy 0>;
+      phy-names = "cdnsp,usb2-phy", "cdnsp,usb3-phy";
+      dr_mode = "peripheral";
+    };
+
+...
-- 
2.17.1