1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/reserved-memory/qcom,rmtfs-mem.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Qualcomm Remote File System Memory
8
9 description: |
10 This binding describes the Qualcomm remote filesystem memory, which serves the
11 purpose of describing the shared memory region used for remote processors to
12 access block device data using the Remote Filesystem protocol.
13
14 maintainers:
15 - Bjorn Andersson <bjorn.andersson@linaro.org>
16
17 allOf:
18 - $ref: reserved-memory.yaml
19
20 properties:
21 compatible:
22 const: qcom,rmtfs-mem
23
24 qcom,client-id:
25 $ref: /schemas/types.yaml#/definitions/uint32
26 description: >
27 identifier of the client to use this region for buffers
28
29 qcom,use-guard-pages:
30 type: boolean
31 description: >
32 Indicates that the firmware, or hardware, does not gracefully handle
33 memory protection of this region when placed adjacent to other protected
34 memory regions, and that padding around the used portion of the memory
35 region is necessary.
36
37 When this is set, the first and last page should be left unused, and the
38 effective size of the region will thereby shrink with two pages.
39
40 qcom,vmid:
41 $ref: /schemas/types.yaml#/definitions/uint32-array
42 description: >
43 Array of vmids of the remote processors, to set up memory protection
44 minItems: 1
45 maxItems: 2
46
47 required:
48 - qcom,client-id
49
50 unevaluatedProperties: false
51
52 examples:
53 - |
54 reserved-memory {
55 #address-cells = <1>;
56 #size-cells = <1>;
57 ranges;
58
59 rmtfs@86700000 {
60 compatible = "qcom,rmtfs-mem";
61 reg = <0x86700000 0xe0000>;
62 no-map;
63
64 qcom,client-id = <1>;
65 };
66 };
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