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authorHadar Gat <hadar.gat@arm.com>2020-03-27 09:10:21 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2020-04-16 09:49:20 +0300
commitffb57daad3a345a90543ffa1bb5e03f76b6453fb (patch)
tree9be89f8fb2a6e74f6bf3ab2c59b1d7851919d925 /Documentation/devicetree/bindings/rng
parent55b3209acbb01cb02b1ee6b1afe80d83b1aab36d (diff)
downloadlinux-ffb57daad3a345a90543ffa1bb5e03f76b6453fb.tar.xz
dt-bindings: add device tree binding for Arm CryptoCell trng engine
The Arm CryptoCell is a hardware security engine. This patch adds DT bindings for its TRNG (True Random Number Generator) engine. Signed-off-by: Hadar Gat <hadar.gat@arm.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'Documentation/devicetree/bindings/rng')
-rw-r--r--Documentation/devicetree/bindings/rng/arm-cctrng.yaml54
1 files changed, 54 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/rng/arm-cctrng.yaml b/Documentation/devicetree/bindings/rng/arm-cctrng.yaml
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+++ b/Documentation/devicetree/bindings/rng/arm-cctrng.yaml
@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rng/arm-cctrng.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Arm TrustZone CryptoCell TRNG engine
+
+maintainers:
+ - Hadar Gat <hadar.gat@arm.com>
+
+description: |+
+ Arm TrustZone CryptoCell TRNG (True Random Number Generator) engine.
+
+properties:
+ compatible:
+ enum:
+ - arm,cryptocell-713-trng
+ - arm,cryptocell-703-trng
+
+ interrupts:
+ maxItems: 1
+
+ reg:
+ maxItems: 1
+
+ arm,rosc-ratio:
+ description:
+ Arm TrustZone CryptoCell TRNG engine has 4 ring oscillators.
+ Sampling ratio values for these 4 ring oscillators. (from calibration)
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32-array
+ - items:
+ maxItems: 4
+
+ clocks:
+ maxItems: 1
+
+required:
+ - compatible
+ - interrupts
+ - reg
+ - arm,rosc-ratio
+
+additionalProperties: false
+
+examples:
+ - |
+ arm_cctrng: rng@60000000 {
+ compatible = "arm,cryptocell-713-trng";
+ interrupts = <0 29 4>;
+ reg = <0x60000000 0x10000>;
+ arm,rosc-ratio = <5000 1000 500 0>;
+ };