dt-bindings: powerpc: Add Freescale/NXP MPC83xx SoCs

Add a new binding for MPC83xx platforms, describing the board compatible
strings used in currently existing device trees.

Note that the SoC bus is called immr@... in many existing devicetrees,
but this contradicts the simple-bus binding.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: J. Neuschäfer <j.ne@posteo.net>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260303-ppcyaml-soc-v5-1-2982d5a857bc@posteo.net

Author: neuschaefer

Documentation/devicetree/bindings/powerpc/fsl/fsl,mpc83xx.yaml

@@ -0,0 +1,93 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/powerpc/fsl/fsl,mpc83xx.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale PowerQUICC II Pro (MPC83xx) platforms
+
+maintainers:
+  - J. Neuschäfer <j.ne@posteo.net>
+
+properties:
+  $nodename:
+    const: '/'
+  compatible:
+    oneOf:
+      - description: MPC83xx Reference Design Boards
+        items:
+          - enum:
+              - fsl,mpc8308rdb
+              - fsl,mpc8315erdb
+              - fsl,mpc8360rdk
+              - fsl,mpc8377rdb
+              - fsl,mpc8377wlan
+              - fsl,mpc8378rdb
+              - fsl,mpc8379rdb
+
+      - description: MPC8313E Reference Design Board
+        items:
+          - const: MPC8313ERDB
+          - const: MPC831xRDB
+          - const: MPC83xxRDB
+
+      - description: MPC8323E Reference Design Board
+        items:
+          - const: MPC8323ERDB
+          - const: MPC832xRDB
+          - const: MPC83xxRDB
+
+      - description: MPC8349E-mITX(-GP) Reference Design Platform
+        items:
+          - enum:
+              - MPC8349EMITX
+              - MPC8349EMITXGP
+          - const: MPC834xMITX
+          - const: MPC83xxMITX
+
+      - description: Keymile KMETER1 board
+        const: keymile,KMETER1
+
+      - description: MPC8308 P1M board
+        const: denx,mpc8308_p1m
+
+patternProperties:
+  "^soc@.*$":
+    type: object
+    properties:
+      compatible:
+        oneOf:
+          - items:
+              - enum:
+                  - fsl,mpc8315-immr
+                  - fsl,mpc8308-immr
+              - const: simple-bus
+          - items:
+              - const: fsl,mpc8360-immr
+              - const: fsl,immr
+              - const: fsl,soc
+              - const: simple-bus
+          - const: simple-bus
+
+additionalProperties: true
+
+examples:
+  - |
+    / {
+        compatible = "fsl,mpc8315erdb";
+        model = "MPC8315E-RDB";
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        soc@e0000000 {
+            compatible = "fsl,mpc8315-immr", "simple-bus";
+            reg = <0xe0000000 0x00000200>;
+            #address-cells = <1>;
+            #size-cells = <1>;
+            device_type = "soc";
+            ranges = <0 0xe0000000 0x00100000>;
+            bus-frequency = <0>;
+        };
+    };
+
+...