linux-kernel - [PATCH v6 1/3] dt-bindings: add device tree binding for Arm CryptoCell trng engine

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Message-Id: <1585114871-6912-2-git-send-email-hadar.gat@arm.com>
Date:   Wed, 25 Mar 2020 07:41:09 +0200
From:   Hadar Gat <hadar.gat@....com>
To:     Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Alexander Sverdlin <alexander.sverdlin@...ia.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tomer Maimon <tmaimon77@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Zaibo Xu <xuzaibo@...wei.com>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc:     linux-crypto@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Gilad Ben-Yossef <gilad@...yossef.com>,
        Ofir Drang <ofir.drang@....com>, Hadar Gat <hadar.gat@....com>
Subject: [PATCH v6 1/3] 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@....com>
---
 .../devicetree/bindings/rng/arm-cctrng.yaml        | 55 ++++++++++++++++++++++
 1 file changed, 55 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..7f70e4b
--- /dev/null
+++ b/Documentation/devicetree/bindings/rng/arm-cctrng.yaml
@@ -0,0 +1,55 @@
+# 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@....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:
+          minItems: 4
+          maxItems: 4
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - interrupts
+  - reg
+  - arm,rosc-ratio
+
+additionalProperties: false
+
+examples:
+  - |
+    arm_cctrng: rng@...00000 {
+        compatible = "arm,cryptocell-713-trng";
+        interrupts = <0 29 4>;
+        reg = <0x60000000 0x10000>;
+        arm,rosc-ratio = <5000 1000 500 0>;
+    };
-- 
2.7.4