1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/soc/qcom/qcom,smem.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Qualcomm Shared Memory Manager
8
9 maintainers:
10 - Andy Gross <agross@kernel.org>
11 - Bjorn Andersson <bjorn.andersson@linaro.org>
12
13 description:
14 This binding describes the Qualcomm Shared Memory Manager, a region of
15 reserved-memory used to share data between various subsystems and OSes in
16 Qualcomm platforms.
17
18 properties:
19 compatible:
20 const: qcom,smem
21
22 reg:
23 maxItems: 1
24
25 memory-region:
26 maxItems: 1
27 description: handle to memory reservation for main SMEM memory region.
28
29 hwlocks:
30 maxItems: 1
31
32 qcom,rpm-msg-ram:
33 $ref: /schemas/types.yaml#/definitions/phandle
34 description: handle to RPM message memory resource
35
36 no-map: true
37
38 required:
39 - compatible
40 - hwlocks
41
42 oneOf:
43 - required:
44 - reg
45 - no-map
46 - required:
47 - memory-region
48
49 additionalProperties: false
50
51 examples:
52 - |
53 reserved-memory {
54 #address-cells = <1>;
55 #size-cells = <1>;
56 ranges;
57
58 smem@fa00000 {
59 compatible = "qcom,smem";
60 reg = <0xfa00000 0x200000>;
61 no-map;
62
63 hwlocks = <&tcsr_mutex 3>;
64 };
65 };
66 - |
67 reserved-memory {
68 #address-cells = <1>;
69 #size-cells = <1>;
70 ranges;
71
72 smem_region: smem@fa00000 {
73 reg = <0xfa00000 0x200000>;
74 no-map;
75 };
76 };
77
78 smem {
79 compatible = "qcom,smem";
80
81 memory-region = <&smem_region>;
82 qcom,rpm-msg-ram = <&rpm_msg_ram>;
83
84 hwlocks = <&tcsr_mutex 3>;
85 };
86
87 soc {
88 #address-cells = <1>;
89 #size-cells = <1>;
90 ranges;
91
92 rpm_msg_ram: sram@fc428000 {
93 compatible = "qcom,rpm-msg-ram";
94 reg = <0xfc428000 0x4000>;
95 };
96 };
97
98 ...
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