[PATCH 3/8] dt-bindings: usb: document the Prolific PL2775 USB-SATA bridge

The APQ8074 Dragonboard has an onboard Prolific PL2775 USB 3.0 to SATA
bridge whose RESET_N pin is wired to a PMIC GPIO, so the device has to
be described in DT for the OS to release it from reset.

Add a schema for the hard-wired PL2775 (067b:2775) with the
reset-gpios and vdd-supply properties used by onboard USB devices.

Assisted-by: Claude:claude-fable-5
Signed-off-by: Dmitry Baryshkov <[email protected]>
---
 .../devicetree/bindings/usb/prolific,pl2775.yaml   | 51 ++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/prolific,pl2775.yaml b/Documentation/devicetree/bindings/usb/prolific,pl2775.yaml
new file mode 100644
index 000000000000..5af8b4f5ee64
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/prolific,pl2775.yaml
@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/prolific,pl2775.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Prolific PL2775 USB 3.0 to SATA bridge
+
+maintainers:
+  - Dmitry Baryshkov <[email protected]>
+
+description:
+  Device tree properties for hard wired Prolific PL2775 USB 3.0 to
+  SATA bridge controllers.
+
+allOf:
+  - $ref: usb-device.yaml#
+
+properties:
+  compatible:
+    const: usb67b,2775
+
+  reg: true
+
+  reset-gpios:
+    description: GPIO connected to the RESET_N pin.
+    maxItems: 1
+
+  vdd-supply:
+    description: Power supply of the controller.
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    usb {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        device@1 {
+            compatible = "usb67b,2775";
+            reg = <1>;
+            reset-gpios = <&gpio1 11 GPIO_ACTIVE_LOW>;
+        };
+    };

-- 
2.47.3