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From: Rob Herring <robh@kernel.org>
To: Hadar Gat <hadar.gat@arm.com>
Cc: Matt Mackall <mpm@selenic.com>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	Mark Rutland <mark.rutland@arm.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Alexander Sverdlin <alexander.sverdlin@nokia.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Tomer Maimon <tmaimon77@gmail.com>,
	Randy Dunlap <rdunlap@infradead.org>,
	Zaibo Xu <xuzaibo@huawei.com>,
	Daniel Thompson <daniel.thompson@linaro.org>,
	Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	Jonathan Cameron <Jonathan.Cameron@huawei.com>,
	linux-crypto@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Gilad Ben-Yossef <gilad@benyossef.com>,
	Ofir Drang <ofir.drang@arm.com>
Subject: Re: [PATCH v6 1/3] dt-bindings: add device tree binding for Arm CryptoCell trng engine
Date: Thu, 26 Mar 2020 13:41:04 -0600	[thread overview]
Message-ID: <20200326194104.GA4118@bogus> (raw)
In-Reply-To: <1585114871-6912-2-git-send-email-hadar.gat@arm.com>

On Wed, Mar 25, 2020 at 07:41:09AM +0200, Hadar Gat wrote:
> 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>
> ---
>  .../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@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:
> +          minItems: 4
> +          maxItems: 4

Aren't there some constraints on the values?

If not, then just this is enough:

- 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>;
> +    };
> -- 
> 2.7.4
> 

  reply	other threads:[~2020-03-26 19:41 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-25  5:41 [PATCH v6 0/3] hw_random: introduce Arm CryptoCell TRNG driver Hadar Gat
2020-03-25  5:41 ` [PATCH v6 1/3] dt-bindings: add device tree binding for Arm CryptoCell trng engine Hadar Gat
2020-03-26 19:41   ` Rob Herring [this message]
2020-03-26 21:04     ` Hadar Gat
2020-03-27  3:04       ` Rob Herring
2020-03-25  5:41 ` [PATCH v6 2/3] hw_random: cctrng: introduce Arm CryptoCell driver Hadar Gat
2020-03-25  5:41 ` [PATCH v6 3/3] MAINTAINERS: add HG as cctrng maintainer Hadar Gat

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