1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2 # Copyright 2019 BayLibre, SAS
3 %YAML 1.2
4 ---
5 $id: http://devicetree.org/schemas/arm/amlogic/amlogic,meson-gx-ao-secure.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
7
8 title: Amlogic Meson Firmware registers Interface
9
10 maintainers:
11 - Neil Armstrong <neil.armstrong@linaro.org>
12
13 description: |
14 The Meson SoCs have a register bank with status and data shared with the
15 secure firmware.
16
17 # We need a select here so we don't match all nodes with 'syscon'
18 select:
19 properties:
20 compatible:
21 contains:
22 const: amlogic,meson-gx-ao-secure
23 required:
24 - compatible
25
26 properties:
27 compatible:
28 oneOf:
29 - items:
30 - const: amlogic,meson-gx-ao-secure
31 - const: syscon
32 - items:
33 - enum:
34 - amlogic,a4-ao-secure
35 - amlogic,c3-ao-secure
36 - amlogic,s4-ao-secure
37 - amlogic,t7-ao-secure
38 - const: amlogic,meson-gx-ao-secure
39 - const: syscon
40 reg:
41 maxItems: 1
42
43 amlogic,has-chip-id:
44 description: |
45 A firmware register encodes the SoC type, package and revision
46 information on the Meson GX SoCs. If present, the interface gives
47 the current SoC version.
48 type: boolean
49
50 required:
51 - compatible
52 - reg
53
54 additionalProperties: false
55
56 examples:
57 - |
58 ao-secure@140 {
59 compatible = "amlogic,meson-gx-ao-secure", "syscon";
60 reg = <0x140 0x140>;
61 amlogic,has-chip-id;
62 };
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