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@xxxxxxx> > --- > .../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@xxxxxxx> > + > +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 >
