dt-bindings: Add devicetree bindings

Add snapshot of device tree bindings from keystone common kernel, branch
"android-mainline-keystone-qcom-release" at c4c12103f9c0 ("Snap for 9228065
from e32903b9a63bb558df8b803b076619c53c16baad to
android-mainline-keystone-qcom-release").

Change-Id: I7682079615cbd9f29340a5c1f2a1d84ec441a1f1
Signed-off-by: Melody Olvera <quic_molvera@quicinc.com>

bindings/mips/ralink.yaml

@@ -0,0 +1,87 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mips/ralink.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Ralink SoC based Platforms
+
+maintainers:
+  - Sergio Paracuellos <sergio.paracuellos@gmail.com>
+
+description: |
+    Boards with a Ralink SoC shall have the following properties.
+
+properties:
+  $nodename:
+    const: '/'
+  compatible:
+    oneOf:
+      - description: Boards with Ralink RT2880 SoC
+        items:
+          - enum:
+              - ralink,rt2880-eval-board
+          - const: ralink,rt2880-soc
+
+      - description: Boards with Ralink RT3050 SoC
+        items:
+          - const: ralink,rt3050-soc
+
+      - description: Boards with Ralink RT3052 SoC
+        items:
+          - enum:
+              - ralink,rt3052-eval-board
+          - const: ralink,rt3052-soc
+
+      - description: Boards with Ralink RT3350 SoC
+        items:
+          - const: ralink,rt3350-soc
+
+      - description: Boards with Ralink RT3352 SoC
+        items:
+          - const: ralink,rt3352-soc
+
+      - description: Boards with Ralink RT3383 SoC
+        items:
+          - enum:
+              - ralink,rt3883-eval-board
+          - const: ralink,rt3383-soc
+
+      - description: Boards with Ralink RT5350 SoC
+        items:
+          - const: ralink,rt5350-soc
+
+      - description: Boards with Mediatek/Ralink MT7620A SoC
+        items:
+          - enum:
+              - ralink,mt7620a-eval-board
+          - const: ralink,mt7620a-soc
+
+      - description: Boards with Mediatek/Ralink MT7620N SoC
+        items:
+          - const: ralink,mt7620n-soc
+
+      - description: Boards with Mediatek/Ralink MT7628A SoC
+        items:
+          - enum:
+              - onion,omega2+
+              - vocore,vocore2
+          - const: ralink,mt7628a-soc
+
+      - description: Boards with Mediatek/Ralink MT7688A SoC
+        items:
+          - enum:
+              - gardena,smart-gateway-mt7688
+              - onion,omega2+
+          - const: ralink,mt7628a-soc
+
+      - description: Boards with Mediatek/Ralink MT7621 SoC
+        items:
+          - enum:
+              - gnubee,gb-pc1
+              - gnubee,gb-pc2
+          - const: mediatek,mt7621-soc
+
+additionalProperties: true
+
+...