[PATCH 1/4] dt-bindings: serial: document esp32-uart bindings

[Max Filippov <jcmvbkbc@gmail.com>]

Add documentation for the ESP32xx UART controllers.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
---
 .../bindings/serial/esp,esp32-uart.yaml       | 48 +++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/serial/esp,esp32-uart.yaml

diff --git a/Documentation/devicetree/bindings/serial/esp,esp32-uart.yaml b/Documentation/devicetree/bindings/serial/esp,esp32-uart.yaml
new file mode 100644
index 000000000000..8b45ef808107
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/esp,esp32-uart.yaml
@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/serial/esp,esp32-uart.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ESP32 UART controller
+
+maintainers:
+  - Max Filippov <jcmvbkbc@gmail.com>
+
+description: |
+  ESP32 UART controller is a part of ESP32 SoC series.
+
+properties:
+  compatible:
+    oneOf:
+      - description: UART controller for the ESP32 SoC
+        const: esp,esp32-uart
+      - description: UART controller for the ESP32S3 SoC
+        const: esp,esp32s3-uart
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    serial0: serial@60000000 {
+            compatible = "esp,esp32s3-uart";
+            reg = <0x60000000 0x80>;
+            interrupts = <27 1 0>;
+            clocks = <&serial_clk>;
+    };
-- 
2.30.2