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

1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/reserved-memory/shared-dma-pool.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: /reserved-memory DMA pool
10   - devicetree-spec@vger.kernel.org
13   - $ref: reserved-memory.yaml
18       - const: shared-dma-pool
20           This indicates a region of memory meant to be used as a shared
21           pool of DMA buffers for a set of devices. It can be used by an
22           operating system to instantiate the necessary pool management
25       - const: restricted-dma-pool
27           This indicates a region of memory meant to be used as a pool
28           of restricted DMA buffers for a set of devices. The memory
30           When using this, the no-map and reusable properties must not
33           restricted DMA is to mitigate the lack of DMA access control
34           on systems without an IOMMU, which could result in the DMA
38           protection against the DMA overwriting buffer contents at
43           up another device coherent pool by shared-dma-pool and use
47   linux,cma-default:
51       the default pool of the contiguous memory allocator.
53   linux,dma-default:
57       the default pool of the consistent DMA allocator.
63         const: restricted-dma-pool
66     no-map: false
72   - |
73       reserved-memory {
74           #address-cells = <1>;
75           #size-cells = <1>;
80               compatible = "shared-dma-pool";
84               linux,cma-default;
91           restricted_dma_reserved: restricted-dma-pool@50000000 {
92               compatible = "restricted-dma-pool";