[PATCH 09/13] dt-bindings: phy: Add documentation for Airoha AN7581 USB PHY

[Christian Marangi <ansuelsmth@gmail.com>]

Add documentation for Airoha AN7581 USB PHY that describe the USB PHY
for the USB controller.

Airoha AN7581 SoC support a maximum of 2 USB port. The USB 2.0 mode is
always supported. The USB 3.0 mode is optional and depends on the Serdes
mode currently configured on the system for the USB port. If USB 3.0 node
is defined, then airoha,scu-ssr property is required for Serdes mode
validation.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
 .../bindings/phy/airoha,an7581-usb-phy.yaml   | 106 ++++++++++++++++++
 MAINTAINERS                                   |   6 +
 2 files changed, 112 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/airoha,an7581-usb-phy.yaml

diff --git a/Documentation/devicetree/bindings/phy/airoha,an7581-usb-phy.yaml b/Documentation/devicetree/bindings/phy/airoha,an7581-usb-phy.yaml
new file mode 100644
index 000000000000..39127cfb63a7
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/airoha,an7581-usb-phy.yaml
@@ -0,0 +1,106 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/airoha,an7581-usb-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Airoha AN7581 SoC USB PHY
+
+maintainers:
+  - Christian Marangi <ansuelsmth@gmail.com>
+
+description: >
+  The Airoha AN7581 SoC USB PHY describes the USB PHY for the USB controller.
+
+  Airoha AN7581 SoC support a maximum of 2 USB port. The USB 2.0 mode is
+  always supported. The USB 3.0 mode is optional and depends on the Serdes
+  mode currently configured on the system for the USB port. If USB 3.0 node
+  is defined, then airoha,scu-ssr property is required for Serdes mode
+  validation.
+
+properties:
+  compatible:
+    const: airoha,an7581-usb-phy
+
+  reg:
+    maxItems: 1
+
+  airoha,port-id:
+    description: Describe the physical port this USB PHY refer to. A dedicated
+      osciallator is used for each port for the USB 2.0 Slew Rate calibration.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [0, 1]
+
+  airoha,scu-ssr:
+    description: Phandle to the SCU SSR node for USB 3.0 Serdes mode validation.
+    $ref: /schemas/types.yaml#/definitions/phandle
+
+  usb2-phy:
+    type: object
+
+    properties:
+      '#phy-cells':
+        const: 1
+
+    required:
+      - '#phy-cells'
+
+    additionalProperties: false
+
+  usb3-phy:
+    type: object
+
+    properties:
+      '#phy-cells':
+        const: 1
+
+    required:
+      - '#phy-cells'
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - airoha,port-id
+  - usb2-phy
+
+if:
+  required:
+    - usb3-phy
+then:
+  required:
+    - airoha,scu-ssr
+
+additionalProperties: false
+
+examples:
+  - |
+    phy@1fac0000 {
+        compatible = "airoha,an7581-usb-phy";
+        reg = <0x1fac0000 0x10000>;
+
+        airoha,port-id = <0>;
+        airoha,scu-ssr = <&scu_ssr>;
+
+        usb0_u2: usb2-phy {
+            #phy-cells = <1>;
+        };
+
+        usb0_u3: usb3-phy {
+            #phy-cells = <1>;
+        };
+    };
+
+  - |
+    phy@1fae0000 {
+        compatible = "airoha,an7581-usb-phy";
+        reg = <0x1fae0000 0x10000>;
+
+        airoha,port-id = <1>;
+
+        usb1_u2: usb2-phy {
+            #phy-cells = <1>;
+        };
+    };
+
diff --git a/MAINTAINERS b/MAINTAINERS
index fe34c80b8d52..c2dd385e9165 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -753,6 +753,12 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/spi/airoha,en7581-snand.yaml
 F:	drivers/spi/spi-airoha-snfi.c
 
+AIROHA USB PHY DRIVER
+M:	Christian Marangi <ansuelsmth@gmail.com>
+L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
+S:	Maintained
+F:	Documentation/devicetree/bindings/phy/airoha,an7581-usb-phy.yam
+
 AIRSPY MEDIA DRIVER
 L:	linux-media@vger.kernel.org
 S:	Orphan
-- 
2.48.1