[PATCH 5/6] dt-bindings: mfd: Add Delta TN48M CPLD drivers bindings

[Robert Marko <robert.marko@xxxxxxxxxx>]

Add binding document for the Delta TN48M CPLD drivers.

Signed-off-by: Robert Marko <robert.marko@xxxxxxxxxx>
---
 .../bindings/mfd/delta,tn48m-cpld.yaml        | 59 +++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/delta,tn48m-cpld.yaml

diff --git a/Documentation/devicetree/bindings/mfd/delta,tn48m-cpld.yaml b/Documentation/devicetree/bindings/mfd/delta,tn48m-cpld.yaml
new file mode 100644
index 000000000000..7d81943d3d27
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/delta,tn48m-cpld.yaml
@@ -0,0 +1,59 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/delta,tn48m-cpld.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Delta Networks TN48M CPLD controller
+
+maintainers:
+  - Robert Marko <robert.marko@xxxxxxxxxx>
+
+description: |
+  Lattice CPLD onboard the TN48M switches is used for system
+  management.
+
+  It provides information about the hardware model, revision,
+  PSU status etc.
+
+  It is also being used as a GPIO expander for the SFP slots.
+
+properties:
+  compatible:
+    const: delta,tn48m-cpld
+
+  reg:
+    description:
+      I2C device address.
+    maxItems: 1
+
+  gpio-controller: true
+
+  "#gpio-cells":
+    const: 2
+    description:
+      The first cell is the pin number and the second cell is used to specify
+      the gpio active state.
+
+required:
+  - compatible
+  - reg
+  - gpio-controller
+  - "#gpio-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        cpld@41 {
+            compatible = "delta,tn48m-cpld";
+            reg = <0x41>;
+
+            gpio-controller;
+            #gpio-cells = <2>;
+        };
+    };
-- 
2.31.1