Add bindings for ARM TrustZone based Security Random Number Generator. Signed-off-by: Neal Liu <neal.liu@xxxxxxxxxxxx> --- Documentation/devicetree/bindings/rng/sec-rng.yaml | 53 ++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 Documentation/devicetree/bindings/rng/sec-rng.yaml diff --git a/Documentation/devicetree/bindings/rng/sec-rng.yaml b/Documentation/devicetree/bindings/rng/sec-rng.yaml new file mode 100644 index 0000000..7f4ae50 --- /dev/null +++ b/Documentation/devicetree/bindings/rng/sec-rng.yaml @@ -0,0 +1,53 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +# # Copyright 2020 MediaTek Inc. +%YAML 1.2 +--- +$id: "http://devicetree.org/schemas/rng/sec-rng.yaml#"; +$schema: "http://devicetree.org/meta-schemas/core.yaml#"; + +title: Security Random Number Generator + +description: | + sec-rng is a security random number generator which provides a generic + interface to get hardware rnd from Secure state. The Secure state can be + Arm Trusted Firmware(ATF), Trusted Execution Environment(TEE), or even + EL2 hypervisor. + +maintainer: + - Neal Liu <neal.liu@xxxxxxxxxxxx> + +properties: + compatible: + enum: + - arm,sec-rng + + method: + description: The method of calling to Secure state + enum: + - smc + - hvc + + method-fid: + description: The function number within the SMC and HVC function identifier + maxItems: 1 + + quality: + description: Estimation of true entropy in RNG's bitstream per 1024 bits + maxItems: 1 + +required: + - compatible + - methods + - method-fid + - quality + +additionalProperties: false + +examples: + - | + hwrng: hwrng { + compatible = "arm,sec-rng"; + method = "smc"; + method-fid = /bits/ 16 <0x26a>; + quality = /bits/ 16 <900>; + }; -- 1.7.9.5
