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70003f512c
The TRNG block in Exynos850 is pretty much the same as in Exynos5250,
but there are two clocks that has to be controlled to make it work:
1. Functional (operating) clock: called ACLK in Exynos850, the same as
"secss" clock in Exynos5250
2. Interface (bus) clock: called PCLK in Exynos850. It has to be
enabled in order to access TRNG registers
Document Exynos850 compatible and the related clock changes.
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
76 lines
1.5 KiB
YAML
76 lines
1.5 KiB
YAML
# 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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$id: http://devicetree.org/schemas/rng/samsung,exynos5250-trng.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Samsung Exynos SoC True Random Number Generator
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maintainers:
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- Krzysztof Kozlowski <krzk@kernel.org>
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- Łukasz Stelmach <l.stelmach@samsung.com>
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properties:
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compatible:
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enum:
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- samsung,exynos5250-trng
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- samsung,exynos850-trng
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clocks:
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minItems: 1
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maxItems: 2
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clock-names:
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minItems: 1
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maxItems: 2
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reg:
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maxItems: 1
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required:
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- compatible
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- clocks
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- clock-names
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- reg
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allOf:
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- if:
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properties:
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compatible:
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contains:
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const: samsung,exynos850-trng
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then:
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properties:
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clocks:
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items:
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- description: SSS (Security Sub System) operating clock
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- description: SSS (Security Sub System) bus clock
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clock-names:
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items:
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- const: secss
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- const: pclk
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else:
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properties:
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clocks:
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items:
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- description: SSS (Security Sub System) operating clock
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clock-names:
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items:
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- const: secss
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/clock/exynos5250.h>
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rng@10830600 {
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compatible = "samsung,exynos5250-trng";
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reg = <0x10830600 0x100>;
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clocks = <&clock CLK_SSS>;
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clock-names = "secss";
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};
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