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-rw-r--r--Documentation/devicetree/bindings/rng/timeriomem_rng.yaml48
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+# SPDX-License-Identifier: GPL-2.0-only
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rng/timeriomem_rng.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TimerIO Random Number Generator
+
+maintainers:
+ - Krzysztof Kozlowski <krzk@kernel.org>
+
+properties:
+ compatible:
+ const: timeriomem_rng
+
+ period:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: wait time in microseconds to use between samples
+
+ quality:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ default: 0
+ description:
+ Estimated number of bits of true entropy per 1024 bits read from the rng.
+ Defaults to zero which causes the kernel's default quality to be used
+ instead. Note that the default quality is usually zero which disables
+ using this rng to automatically fill the kernel's entropy pool.
+
+ reg:
+ maxItems: 1
+ description:
+ Base address to sample from. Currently 'reg' must be at least four bytes
+ wide and 32-bit aligned.
+
+required:
+ - compatible
+ - period
+ - reg
+
+additionalProperties: false
+
+examples:
+ - |
+ rng@44 {
+ compatible = "timeriomem_rng";
+ reg = <0x44 0x04>;
+ period = <1000000>;
+ };