dt-bindings: net: marvell,prestera: Describe PCI devices of the prestera family

Even though the devices have very little in common beside the name and
the main "switch" feature, Marvell Prestera switch family is also
composed of PCI-only devices which can receive additional static
properties, like nvmem cells to point at MAC addresses, for
instance. Let's describe them.

Signed-off-by: Miquel Raynal <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Signed-off-by: Paolo Abeni <[e-mail]>

Documentation/devicetree/bindings/net/marvell,prestera.yaml

···
 $id: http://devicetree.org/schemas/net/marvell,prestera.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: Marvell Prestera AlleyCat3 switch
+title: Marvell Prestera switch family
 
 maintainers:
   - Miquel Raynal <[e-mail]>
 
 properties:
   compatible:
-    items:
+    oneOf:
+      - items:
+          - enum:
+              - marvell,prestera-98dx3236
+              - marvell,prestera-98dx3336
+              - marvell,prestera-98dx4251
+          - const: marvell,prestera
       - enum:
-          - marvell,prestera-98dx3236
-          - marvell,prestera-98dx3336
-          - marvell,prestera-98dx4251
-      - const: marvell,prestera
+          - pci11ab,c804
+          - pci11ab,c80c
+          - pci11ab,cc1e
 
   reg:
     maxItems: 1
···
     description: Reference to the DFX Server bus node.
     $ref: /schemas/types.yaml#/definitions/phandle
 
+  nvmem-cells: true
+
+  nvmem-cell-names: true
+
+if:
+  properties:
+    compatible:
+      contains:
+        const: marvell,prestera
+
+# Memory mapped AlleyCat3 family
+then:
+  properties:
+    nvmem-cells: false
+    nvmem-cell-names: false
+  required:
+    - interrupts
+
+# PCI Aldrin family
+else:
+  properties:
+    interrupts: false
+    dfx: false
+
 required:
   - compatible
   - reg
-  - interrupts
 
-additionalProperties: false
+# Ports can also be described
+additionalProperties:
+  type: object
 
 examples:
   - |
···
         reg = <0 0x4000000>;
         interrupts = <33>, <34>, <35>;
         dfx = <&dfx>;
+    };
+
+  - |
+    pcie@0 {
+        #address-cells = <3>;
+        #size-cells = <2>;
+        ranges = <0x0 0x0 0x0 0x0 0x0 0x0>;
+        reg = <0x0 0x0 0x0 0x0 0x0 0x0>;
+        device_type = "pci";
+
+        switch@0,0 {
+            reg = <0x0 0x0 0x0 0x0 0x0>;
+            compatible = "pci11ab,c80c";
+            nvmem-cells = <&mac_address 0>;
+            nvmem-cell-names = "mac-address";
+        };
     };