[PATCH v3 tty-next 1/2] dt-bindings: serial: ni,ni16650: add bindings

[Brenda Streiff]

Add bindings for the NI 16550 UART.

Signed-off-by: Brenda Streiff <brenda.streiff@xxxxxx>
Cc: Gratian Crisan <gratian.crisan@xxxxxx>
Cc: Jason Smith <jason.smith@xxxxxx>
---
 .../bindings/serial/ni,ni16550.yaml           | 64 +++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/serial/ni,ni16550.yaml

diff --git a/Documentation/devicetree/bindings/serial/ni,ni16550.yaml b/Documentation/devicetree/bindings/serial/ni,ni16550.yaml
new file mode 100644
index 000000000000..93b88c8206b9
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/ni,ni16550.yaml
@@ -0,0 +1,64 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/serial/ni,ni16550.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NI 16550 asynchronous serial interface (UART)
+
+maintainers:
+  - Brenda Streiff <brenda.streiff@xxxxxx>
+
+allOf:
+  - $ref: serial.yaml#
+
+properties:
+  compatible:
+    const: ni,ni16550
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: baudclk
+
+  # legacy clock property; prefer 'clocks' instead
+  clock-frequency: true
+
+  ni,serial-port-mode:
+    description: Indicates whether this is an RS-232 or RS-485 serial port.
+    $ref: /schemas/types.yaml#/definitions/string
+    enum: [ RS-232, RS-485 ]
+    default: RS-485
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    serial@80000000 {
+      compatible = "ni,ni16550";
+      reg = <0x80000000 0x8>;
+      interrupts = <0 30 4>;
+      clock-names = "baudclk";
+      clocks = <&clk_uart>;
+      ni,serial-port-mode = "RS-232";
+    };
+
+    clk_uart: clock {
+      compatible = "fixed-clock";
+      #clock-cells = <0>;
+      clock-frequency = <58824000>;
+    };
+...
-- 
2.30.2