Squashed 'dts/upstream/' content from commit aaba2d45dc2a

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diff --git a/Bindings/nvmem/nvmem-deprecated-cells.yaml b/Bindings/nvmem/nvmem-deprecated-cells.yaml
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+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/nvmem-deprecated-cells.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NVMEM old syntax for fixed cells
+
+maintainers:
+  - Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
+
+description: |
+  Before introducing NVMEM layouts all NVMEM (fixed) cells were defined
+  as direct device subnodes. That syntax was replaced by "fixed-layout"
+  and is deprecated now. No new bindings should use it.
+
+patternProperties:
+  "@[0-9a-f]+(,[0-7])?$":
+    type: object
+    allOf:
+      - $ref: layouts/fixed-cell.yaml
+      - properties:
+          compatible: false
+    deprecated: true
+
+additionalProperties: true
+
+...