dt-bindings: Drop kernel copy of common reserved-memory bindings

The common reserved-memory bindings have recently been copied from the
kernel tree into dtschema. The preference is to host common, stable
bindings in dtschema. As reserved-memory is documented in the DT Spec,
it meets the criteria.

The v2023.09 version of dtschema is what contains the reserved-memory
schemas we depend on, so bump the minimum version to that. Otherwise,
references to these schemas will generate errors.

Reviewed-by: Simon Glass <[e-mail]>
Reviewed-by: Mathieu Poirier <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Rob Herring <[e-mail]>

Documentation/devicetree/bindings/Makefile

···
 DT_SCHEMA_LINT = $(shell which yamllint || \
   echo "warning: python package 'yamllint' not installed, skipping" >&2)
 
-DT_SCHEMA_MIN_VERSION = 2022.3
+DT_SCHEMA_MIN_VERSION = 2023.9
 
 PHONY += check_dtschema_version
 check_dtschema_version:

Documentation/devicetree/bindings/remoteproc/renesas,rcar-rproc.yaml

···
       remoteproc device. This is variable and describes the memories shared with
       the remote processor (e.g. remoteproc firmware and carveouts, rpmsg
       vrings, ...).
-      (see ../reserved-memory/reserved-memory.yaml)
+      (see reserved-memory/reserved-memory.yaml in dtschema project)
 
 required:
   - compatible

Documentation/devicetree/bindings/reserved-memory/framebuffer.yaml

···
-# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
-%YAML 1.2
----
-$id: http://devicetree.org/schemas/reserved-memory/framebuffer.yaml#
-$schema: http://devicetree.org/meta-schemas/core.yaml#
-
-title: /reserved-memory framebuffer node
-
-maintainers:
-  - [e-mail]
-
-allOf:
-  - $ref: reserved-memory.yaml
-
-properties:
-  compatible:
-    const: framebuffer
-    description: >
-      This indicates a region of memory meant to be used as a framebuffer for
-      a set of display devices. It can be used by an operating system to keep
-      the framebuffer from being overwritten and use it as the backing memory
-      for a display device (such as simple-framebuffer).
-
-unevaluatedProperties: false
-
-examples:
-  - |
-    / {
-        compatible = "foo";
-        model = "foo";
-        #address-cells = <1>;
-        #size-cells = <1>;
-
-        chosen {
-            framebuffer {
-                compatible = "simple-framebuffer";
-                memory-region = <&fb>;
-            };
-        };
-
-        reserved-memory {
-            #address-cells = <1>;
-            #size-cells = <1>;
-            ranges;
-
-            fb: framebuffer@80000000 {
-                compatible = "framebuffer";
-                reg = <0x80000000 0x007e9000>;
-            };
-        };
-    };
-...

Documentation/devicetree/bindings/reserved-memory/memory-region.yaml

···
-# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
-%YAML 1.2
----
-$id: http://devicetree.org/schemas/reserved-memory/memory-region.yaml#
-$schema: http://devicetree.org/meta-schemas/core.yaml#
-
-title: Reserved Memory Region
-
-maintainers:
-  - [e-mail]
-
-description: |
-  Regions in the /reserved-memory node may be referenced by other device
-  nodes by adding a memory-region property to the device node.
-
-select: true
-
-properties:
-  memory-region:
-    $ref: /schemas/types.yaml#/definitions/phandle-array
-    description: >
-      Phandle to a /reserved-memory child node assigned to the device.
-
-  memory-region-names:
-    $ref: /schemas/types.yaml#/definitions/string-array
-    description: >
-      A list of names, one for each corresponding entry in the
-      memory-region property
-
-additionalProperties: true
-
-examples:
-  - |
-    fb0: video@12300000 {
-        /* ... */
-        reg = <0x12300000 0x1000>;
-        memory-region = <&display_reserved>;
-    };
-
-...

Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt

···
-This file has been moved to reserved-memory.yaml.
+This file has been moved to reserved-memory.yaml in the dtschema repository.

Documentation/devicetree/bindings/reserved-memory/reserved-memory.yaml

···
-# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
-%YAML 1.2
----
-$id: http://devicetree.org/schemas/reserved-memory/reserved-memory.yaml#
-$schema: http://devicetree.org/meta-schemas/core.yaml#
-
-title: /reserved-memory Child Node Common
-
-maintainers:
-  - [e-mail]
-
-description: >
-  Reserved memory is specified as a node under the /reserved-memory node. The
-  operating system shall exclude reserved memory from normal usage one can
-  create child nodes describing particular reserved (excluded from normal use)
-  memory regions. Such memory regions are usually designed for the special
-  usage by various device drivers.
-
-  Each child of the reserved-memory node specifies one or more regions
-  of reserved memory. Each child node may either use a 'reg' property to
-  specify a specific range of reserved memory, or a 'size' property with
-  optional constraints to request a dynamically allocated block of
-  memory.
-
-  Following the generic-names recommended practice, node names should
-  reflect the purpose of the node (ie. "framebuffer" or "dma-pool").
-  Unit address (@<address>) should be appended to the name if the node
-  is a static allocation.
-
-properties:
-  reg: true
-
-  size:
-    oneOf:
-      - $ref: /schemas/types.yaml#/definitions/uint32
-      - $ref: /schemas/types.yaml#/definitions/uint64
-    description: >
-      Length based on parent's \#size-cells. Size in bytes of memory to
-      reserve.
-
-  alignment:
-    oneOf:
-      - $ref: /schemas/types.yaml#/definitions/uint32
-      - $ref: /schemas/types.yaml#/definitions/uint64
-    description: >
-      Length based on parent's \#size-cells. Address boundary for
-      alignment of allocation.
-
-  alloc-ranges:
-    $ref: /schemas/types.yaml#/definitions/uint32-array
-    description: >
-      Address and Length pairs. Specifies regions of memory that are
-      acceptable to allocate from.
-
-  iommu-addresses:
-    $ref: /schemas/types.yaml#/definitions/phandle-array
-    description: >
-      A list of phandle and specifier pairs that describe static IO virtual
-      address space mappings and carveouts associated with a given reserved
-      memory region. The phandle in the first cell refers to the device for
-      which the mapping or carveout is to be created.
-
-      The specifier consists of an address/size pair and denotes the IO
-      virtual address range of the region for the given device. The exact
-      format depends on the values of the "#address-cells" and "#size-cells"
-      properties of the device referenced via the phandle.
-
-      When used in combination with a "reg" property, an IOVA mapping is to
-      be established for this memory region. One example where this can be
-      useful is to create an identity mapping for physical memory that the
-      firmware has configured some hardware to access (such as a bootsplash
-      framebuffer).
-
-      If no "reg" property is specified, the "iommu-addresses" property
-      defines carveout regions in the IOVA space for the given device. This
-      can be useful if a certain memory region should not be mapped through
-      the IOMMU.
-
-  no-map:
-    type: boolean
-    description: >
-      Indicates the operating system must not create a virtual mapping
-      of the region as part of its standard mapping of system memory,
-      nor permit speculative access to it under any circumstances other
-      than under the control of the device driver using the region.
-
-  reusable:
-    type: boolean
-    description: >
-      The operating system can use the memory in this region with the
-      limitation that the device driver(s) owning the region need to be
-      able to reclaim it back. Typically that means that the operating
-      system can use that region to store volatile or cached data that
-      can be otherwise regenerated or migrated elsewhere.
-
-allOf:
-  - if:
-      required:
-        - no-map
-
-    then:
-      not:
-        required:
-          - reusable
-
-  - if:
-      required:
-        - reusable
-
-    then:
-      not:
-        required:
-          - no-map
-
-oneOf:
-  - oneOf:
-      - required:
-          - reg
-
-      - required:
-          - size
-
-  - oneOf:
-      # IOMMU reservations
-      - required:
-          - iommu-addresses
-
-      # IOMMU mappings
-      - required:
-          - reg
-          - iommu-addresses
-
-additionalProperties: true
-
-examples:
-  - |
-    / {
-      compatible = "foo";
-      model = "foo";
-
-      #address-cells = <2>;
-      #size-cells = <2>;
-
-      reserved-memory {
-        #address-cells = <2>;
-        #size-cells = <2>;
-        ranges;
-
-        adsp_resv: reservation-adsp {
-          /*
-           * Restrict IOVA mappings for ADSP buffers to the 512 MiB region
-           * from 0x40000000 - 0x5fffffff. Anything outside is reserved by
-           * the ADSP for I/O memory and private memory allocations.
-           */
-          iommu-addresses = <&adsp 0x0 0x00000000 0x00 0x40000000>,
-                            <&adsp 0x0 0x60000000 0xff 0xa0000000>;
-        };
-
-        fb: framebuffer@90000000 {
-          reg = <0x0 0x90000000 0x0 0x00800000>;
-          iommu-addresses = <&dc0 0x0 0x90000000 0x0 0x00800000>;
-        };
-      };
-
-      bus@0 {
-        #address-cells = <1>;
-        #size-cells = <1>;
-        ranges = <0x0 0x0 0x0 0x40000000>;
-
-        adsp: adsp@2990000 {
-          reg = <0x2990000 0x2000>;
-          memory-region = <&adsp_resv>;
-        };
-
-        dc0: display@15200000 {
-          reg = <0x15200000 0x10000>;
-          memory-region = <&fb>;
-        };
-      };
-    };
-...

Documentation/devicetree/bindings/reserved-memory/shared-dma-pool.yaml

···
-# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
-%YAML 1.2
----
-$id: http://devicetree.org/schemas/reserved-memory/shared-dma-pool.yaml#
-$schema: http://devicetree.org/meta-schemas/core.yaml#
-
-title: /reserved-memory DMA pool
-
-maintainers:
-  - [e-mail]
-
-allOf:
-  - $ref: reserved-memory.yaml
-
-properties:
-  compatible:
-    oneOf:
-      - const: shared-dma-pool
-        description: >
-          This indicates a region of memory meant to be used as a shared
-          pool of DMA buffers for a set of devices. It can be used by an
-          operating system to instantiate the necessary pool management
-          subsystem if necessary.
-
-      - const: restricted-dma-pool
-        description: >
-          This indicates a region of memory meant to be used as a pool
-          of restricted DMA buffers for a set of devices. The memory
-          region would be the only region accessible to those devices.
-          When using this, the no-map and reusable properties must not
-          be set, so the operating system can create a virtual mapping
-          that will be used for synchronization. The main purpose for
-          restricted DMA is to mitigate the lack of DMA access control
-          on systems without an IOMMU, which could result in the DMA
-          accessing the system memory at unexpected times and/or
-          unexpected addresses, possibly leading to data leakage or
-          corruption. The feature on its own provides a basic level of
-          protection against the DMA overwriting buffer contents at
-          unexpected times. However, to protect against general data
-          leakage and system memory corruption, the system needs to
-          provide way to lock down the memory access, e.g., MPU. Note
-          that since coherent allocation needs remapping, one must set
-          up another device coherent pool by shared-dma-pool and use
-          dma_alloc_from_dev_coherent instead for atomic coherent
-          allocation.
-
-  linux,cma-default:
-    type: boolean
-    description: >
-      If this property is present, then Linux will use the region for
-      the default pool of the contiguous memory allocator.
-
-  linux,dma-default:
-    type: boolean
-    description: >
-      If this property is present, then Linux will use the region for
-      the default pool of the consistent DMA allocator.
-
-if:
-  properties:
-    compatible:
-      contains:
-        const: restricted-dma-pool
-then:
-  properties:
-    no-map: false
-    reusable: false
-
-unevaluatedProperties: false
-
-examples:
-  - |
-      reserved-memory {
-          #address-cells = <1>;
-          #size-cells = <1>;
-          ranges;
-
-          /* global autoconfigured region for contiguous allocations */
-          linux,cma {
-              compatible = "shared-dma-pool";
-              reusable;
-              size = <0x4000000>;
-              alignment = <0x2000>;
-              linux,cma-default;
-          };
-
-          display_reserved: framebuffer@78000000 {
-              reg = <0x78000000 0x800000>;
-          };
-
-          restricted_dma_reserved: restricted-dma-pool@50000000 {
-              compatible = "restricted-dma-pool";
-              reg = <0x50000000 0x4000000>;
-          };
-      };
-
-...

Documentation/devicetree/bindings/sound/mediatek,mt8188-afe.yaml

···
     maxItems: 1
     description: |
       Shared memory region for AFE memif.  A "shared-dma-pool".
-      See ../reserved-memory/reserved-memory.yaml for details.
+      See dtschema reserved-memory/shared-dma-pool.yaml for details.
 
   mediatek,topckgen:
     $ref: /schemas/types.yaml#/definitions/phandle