[PATCH v2 1/3] dt-bindings: add device tree binding for Arm CryptoCell trng engine

From: Hadar Gat
Date: Sun Feb 02 2020 - 08:27:56 EST


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@xxxxxxx>
---
.../devicetree/bindings/rng/arm-cctrng.yaml | 51 ++++++++++++++++++++++
1 file changed, 51 insertions(+)
create mode 100644 Documentation/devicetree/bindings/rng/arm-cctrng.yaml

diff --git a/Documentation/devicetree/bindings/rng/arm-cctrng.yaml b/Documentation/devicetree/bindings/rng/arm-cctrng.yaml
new file mode 100644
index 0000000..fe9422e
--- /dev/null
+++ b/Documentation/devicetree/bindings/rng/arm-cctrng.yaml
@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rng/arm-cctrng.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Arm ZrustZone CryptoCell TRNG engine
+
+maintainers:
+ - Hadar Gat <hadar.gat@xxxxxxx>
+
+description: |+
+ Arm ZrustZone CryptoCell TRNG (True Random Number Generator) engine.
+
+properties:
+ compatible:
+ description: Should be "arm,cryptocell-7x3-trng"
+ const: arm,cryptocell-7x3-trng
+
+ interrupts:
+ description: Interrupt number for the device.
+ maxItems: 1
+
+ reg:
+ description: Base physical address of the engine and length of memory
+ mapped region.
+ maxItems: 1
+
+ rosc-ratio:
+ description: Sampling ratio values from calibration for 4 ring oscillators.
+ maxItems: 1
+
+ clocks:
+ description: Reference to the crypto engine clock.
+
+required:
+ - compatible
+ - interrupts
+ - reg
+ - rosc-ratio
+
+additionalProperties: false
+
+examples:
+ - |
+ arm_cctrng: arm_cctrng@60000000 {
+ compatible = "arm,cryptocell-7x3-trng";
+ interrupts = <0 29 4>;
+ reg = <0x60000000 0x10000>;
+ rosc-ratio = <5000 1000 500 0>;
+ };
--
2.7.4