# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/rng/arm-cctrng.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Arm TrustZone CryptoCell TRNG engine
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maintainers:
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- Hadar Gat <hadar.gat@arm.com>
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description: |+
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Arm TrustZone CryptoCell TRNG (True Random Number Generator) engine.
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properties:
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compatible:
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enum:
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- arm,cryptocell-713-trng
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- arm,cryptocell-703-trng
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interrupts:
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maxItems: 1
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reg:
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maxItems: 1
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arm,rosc-ratio:
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description:
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Arm TrustZone CryptoCell TRNG engine has 4 ring oscillators.
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Sampling ratio values for these 4 ring oscillators. (from calibration)
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$ref: /schemas/types.yaml#/definitions/uint32-array
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maxItems: 4
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clocks:
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maxItems: 1
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required:
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- compatible
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- interrupts
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- reg
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- arm,rosc-ratio
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additionalProperties: false
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examples:
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- |
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arm_cctrng: rng@60000000 {
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compatible = "arm,cryptocell-713-trng";
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interrupts = <0 29 4>;
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reg = <0x60000000 0x10000>;
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arm,rosc-ratio = <5000 1000 500 0>;
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};
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