Add dt bindings for adg2404.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
---
changes in v2:
 * rename addr-gpios to mux-gpios
 * rename en-gpios to enable-gpios
 * use items format for mux-gpios description
 * simplify property descriptions
---
 .../devicetree/bindings/mux/adi,adg2404.yaml  | 66 +++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mux/adi,adg2404.yaml

diff --git a/Documentation/devicetree/bindings/mux/adi,adg2404.yaml b/Documentation/devicetree/bindings/mux/adi,adg2404.yaml
new file mode 100644
index 000000000000..d5a7c205d579
--- /dev/null
+++ b/Documentation/devicetree/bindings/mux/adi,adg2404.yaml
@@ -0,0 +1,66 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mux/adi,adg2404.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices ADG2404 4:1 multiplexer
+
+maintainers:
+  - Antoniu Miclaus <antoniu.miclaus@analog.com>
+
+description: |
+  Bindings for Analog Devices ADG2404 4:1 single-ended analog multiplexer
+
+  The multiplexer state corresponds to the selected input channel:
+  * 0: Channel S1 selected
+  * 1: Channel S2 selected
+  * 2: Channel S3 selected
+  * 3: Channel S4 selected
+
+allOf:
+  - $ref: mux-controller.yaml#
+
+properties:
+  compatible:
+    const: adi,adg2404
+
+  mux-gpios:
+    description:
+      GPIO pins connected to the address inputs.
+    items:
+      - description: A0 address pin
+      - description: A1 address pin
+
+  enable-gpios:
+    description:
+      GPIO connected to the EN (enable) pin. Active high.
+    maxItems: 1
+
+  '#mux-control-cells':
+    const: 0
+
+required:
+  - compatible
+  - mux-gpios
+  - enable-gpios
+  - '#mux-control-cells'
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    mux-controller {
+        compatible = "adi,adg2404";
+        #mux-control-cells = <0>;
+
+        mux-gpios = <&gpio 1 GPIO_ACTIVE_HIGH>,
+                    <&gpio 2 GPIO_ACTIVE_HIGH>;
+        enable-gpios = <&gpio 3 GPIO_ACTIVE_HIGH>;
+
+        idle-state = <0>; /* Select channel S1 when idle */
+    };
+
+...
-- 
2.43.0