1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-C 1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2 %YAML 1.2 2 %YAML 1.2
3 --- 3 ---
4 $id: http://devicetree.org/schemas/rng/arm-cct 4 $id: http://devicetree.org/schemas/rng/arm-cctrng.yaml#
5 $schema: http://devicetree.org/meta-schemas/co 5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6 6
7 title: Arm TrustZone CryptoCell TRNG engine 7 title: Arm TrustZone CryptoCell TRNG engine
8 8
9 maintainers: 9 maintainers:
10 - Hadar Gat <hadar.gat@arm.com> 10 - Hadar Gat <hadar.gat@arm.com>
11 11
12 description: |+ 12 description: |+
13 Arm TrustZone CryptoCell TRNG (True Random N 13 Arm TrustZone CryptoCell TRNG (True Random Number Generator) engine.
14 14
15 properties: 15 properties:
16 compatible: 16 compatible:
17 enum: 17 enum:
18 - arm,cryptocell-713-trng 18 - arm,cryptocell-713-trng
19 - arm,cryptocell-703-trng 19 - arm,cryptocell-703-trng
20 20
21 interrupts: 21 interrupts:
22 maxItems: 1 22 maxItems: 1
23 23
24 reg: 24 reg:
25 maxItems: 1 25 maxItems: 1
26 26
27 arm,rosc-ratio: 27 arm,rosc-ratio:
28 description: 28 description:
29 Arm TrustZone CryptoCell TRNG engine has 29 Arm TrustZone CryptoCell TRNG engine has 4 ring oscillators.
30 Sampling ratio values for these 4 ring o 30 Sampling ratio values for these 4 ring oscillators. (from calibration)
31 $ref: /schemas/types.yaml#/definitions/uin 31 $ref: /schemas/types.yaml#/definitions/uint32-array
32 maxItems: 4 32 maxItems: 4
33 33
34 clocks: 34 clocks:
35 maxItems: 1 35 maxItems: 1
36 36
37 required: 37 required:
38 - compatible 38 - compatible
39 - interrupts 39 - interrupts
40 - reg 40 - reg
41 - arm,rosc-ratio 41 - arm,rosc-ratio
42 42
43 additionalProperties: false 43 additionalProperties: false
44 44
45 examples: 45 examples:
46 - | 46 - |
47 arm_cctrng: rng@60000000 { 47 arm_cctrng: rng@60000000 {
48 compatible = "arm,cryptocell-713-trng" 48 compatible = "arm,cryptocell-713-trng";
49 interrupts = <0 29 4>; 49 interrupts = <0 29 4>;
50 reg = <0x60000000 0x10000>; 50 reg = <0x60000000 0x10000>;
51 arm,rosc-ratio = <5000 1000 500 0>; 51 arm,rosc-ratio = <5000 1000 500 0>;
52 }; 52 };
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