dt-bindings: mfd: Add Delta TN48M CPLD drivers bindings

Add binding documents for the Delta TN48M CPLD drivers.
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Link: https://lore.kernel.org/r/20220131133049.77780-6-robert.marko@sartura.hrSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/gpio/delta,tn48m-gpio.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/gpio/delta,tn48m-gpio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Delta Networks TN48M CPLD GPIO controller
+
+maintainers:
+  - Robert Marko <robert.marko@sartura.hr>
+
+description: |
+  This module is part of the Delta TN48M multi-function device. For more
+  details see ../mfd/delta,tn48m-cpld.yaml.
+
+  Delta TN48M has an onboard Lattice CPLD that is used as an GPIO expander.
+  It provides 12 pins in total, they are input-only or ouput-only type.
+
+properties:
+  compatible:
+    enum:
+      - delta,tn48m-gpo
+      - delta,tn48m-gpi
+
+  reg:
+    maxItems: 1
+
+  "#gpio-cells":
+    const: 2
+
+  gpio-controller: true
+
+required:
+  - compatible
+  - reg
+  - "#gpio-cells"
+  - gpio-controller
+
+additionalProperties: false

Documentation/devicetree/bindings/mfd/delta,tn48m-cpld.yaml

+# 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@sartura.hr>
+
+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 and reset controller
+  for the switch MAC-s and other peripherals.
+
+properties:
+  compatible:
+    const: delta,tn48m-cpld
+
+  reg:
+    description:
+      I2C device address.
+    maxItems: 1
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - "#address-cells"
+  - "#size-cells"
+
+patternProperties:
+  "^gpio(@[0-9a-f]+)?$":
+    $ref: ../gpio/delta,tn48m-gpio.yaml
+
+  "^reset-controller?$":
+    $ref: ../reset/delta,tn48m-reset.yaml
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        cpld@41 {
+            compatible = "delta,tn48m-cpld";
+            reg = <0x41>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            gpio@31 {
+                compatible = "delta,tn48m-gpo";
+                reg = <0x31>;
+                gpio-controller;
+                #gpio-cells = <2>;
+            };
+
+            gpio@3a {
+                compatible = "delta,tn48m-gpi";
+                reg = <0x3a>;
+                gpio-controller;
+                #gpio-cells = <2>;
+            };
+
+            gpio@40 {
+                compatible = "delta,tn48m-gpi";
+                reg = <0x40>;
+                gpio-controller;
+                #gpio-cells = <2>;
+            };
+
+            reset-controller {
+              compatible = "delta,tn48m-reset";
+              #reset-cells = <1>;
+            };
+        };
+    };

Documentation/devicetree/bindings/reset/delta,tn48m-reset.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/reset/delta,tn48m-reset.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Delta Networks TN48M CPLD reset controller
+
+maintainers:
+  - Robert Marko <robert.marko@sartura.hr>
+
+description: |
+  This module is part of the Delta TN48M multi-function device. For more
+  details see ../mfd/delta,tn48m-cpld.yaml.
+
+  Reset controller modules provides resets for the following:
+  * 88F7040 SoC
+  * 88F6820 SoC
+  * 98DX3265 switch MAC-s
+  * 88E1680 PHY-s
+  * 88E1512 PHY
+  * PoE PSE controller
+
+properties:
+  compatible:
+    const: delta,tn48m-reset
+
+  "#reset-cells":
+    const: 1
+
+required:
+  - compatible
+  - "#reset-cells"
+
+additionalProperties: false