linux-kernel - [PATCH v3 1/3] dt-bindings: add device tree binding for Arm CryptoCell trng engine

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Date:   Wed,  5 Feb 2020 19:23:23 +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>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Tomer Maimon <tmaimon77@...il.com>,
        Stefan Wahren <wahrenst@....net>,
        Sumit Garg <sumit.garg@...aro.org>,
        Zaibo Xu <xuzaibo@...wei.com>,
        Weili Qian <qianweili@...wei.com>,
        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 v3 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        | 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@....com>
+
+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@...00000 {
+        compatible = "arm,cryptocell-7x3-trng";
+        interrupts = <0 29 4>;
+        reg = <0x60000000 0x10000>;
+        rosc-ratio = <5000 1000 500 0>;
+    };
-- 
2.7.4