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diff --git a/Documentation/devicetree/bindings/misc/lwn,bk4-spi.yaml b/Documentation/devicetree/bindings/misc/lwn,bk4-spi.yaml
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/misc/lwn,bk4-spi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Liebherr's BK4 external SPI controller
+
+maintainers:
+  - Lukasz Majewski <lukma@denx.de>
+
+description: |
+  Liebherr's BK4 external SPI controller is a device which handles data
+  acquisition from compatible industrial peripherals.
+  The SPI is used for data and management purposes in both master and
+  slave modes.
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+properties:
+  compatible:
+    const: lwn,bk4-spi
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 30000000
+
+  fsl,spi-cs-sck-delay: true
+
+  fsl,spi-sck-cs-delay: true
+
+required:
+  - compatible
+  - spi-max-frequency
+
+additionalProperties: false
+
+examples:
+  - |
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        spidev@0 {
+            compatible = "lwn,bk4-spi";
+            reg = <0>;
+            spi-max-frequency = <30000000>;
+            fsl,spi-cs-sck-delay = <200>;
+            fsl,spi-sck-cs-delay = <400>;
+        };
+    };