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diff --git a/Documentation/devicetree/bindings/gpio/kontron,sl28cpld-gpio.yaml b/Documentation/devicetree/bindings/gpio/kontron,sl28cpld-gpio.yaml
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+++ b/Documentation/devicetree/bindings/gpio/kontron,sl28cpld-gpio.yaml
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/gpio/kontron,sl28cpld-gpio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: GPIO driver for the sl28cpld board management controller
+
+maintainers:
+  - Michael Walle <michael@walle.cc>
+
+description: |
+  This module is part of the sl28cpld multi-function device. For more
+  details see ../mfd/kontron,sl28cpld.yaml.
+
+  There are three flavors of the GPIO controller, one full featured
+  input/output with interrupt support (kontron,sl28cpld-gpio), one
+  output-only (kontron,sl28-gpo) and one input-only (kontron,sl28-gpi).
+
+  Each controller supports 8 GPIO lines.
+
+properties:
+  compatible:
+    enum:
+      - kontron,sl28cpld-gpio
+      - kontron,sl28cpld-gpi
+      - kontron,sl28cpld-gpo
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  "#interrupt-cells":
+    const: 2
+
+  interrupt-controller: true
+
+  "#gpio-cells":
+    const: 2
+
+  gpio-controller: true
+
+  gpio-line-names:
+      minItems: 1
+      maxItems: 8
+
+required:
+  - compatible
+  - "#gpio-cells"
+  - gpio-controller
+
+additionalProperties: false