Documentation/devicetree/bindings/rng/arm-cctrng.yaml

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