linux-kernel - Re: [PATCH v1 1/2] dt-binding: hwrng: add NPCM RNG documentation

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Message-ID: <20190829104942.uyz5ms4m65hcqvmk@holly.lan>
Date:   Thu, 29 Aug 2019 11:49:42 +0100
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Tomer Maimon <tmaimon77@...il.com>
Cc:     mpm@...enic.com, herbert@...dor.apana.org.au, arnd@...db.de,
        gregkh@...uxfoundation.org, robh+dt@...nel.org,
        mark.rutland@....com, avifishman70@...il.com,
        tali.perry1@...il.com, venture@...gle.com, yuenn@...gle.com,
        benjaminfair@...gle.com, sumit.garg@...aro.org,
        jens.wiklander@...aro.org, vkoul@...nel.org, tglx@...utronix.de,
        joel@....id.au, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        openbmc@...ts.ozlabs.org
Subject: Re: [PATCH v1 1/2] dt-binding: hwrng: add NPCM RNG documentation

On Wed, Aug 28, 2019 at 07:26:16PM +0300, Tomer Maimon wrote:
> Added device tree binding documentation for Nuvoton BMC
> NPCM Random Number Generator (RNG).
> 
> Signed-off-by: Tomer Maimon <tmaimon77@...il.com>
> ---
>  .../bindings/rng/nuvoton,npcm-rng.txt           | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/rng/nuvoton,npcm-rng.txt
> 
> diff --git a/Documentation/devicetree/bindings/rng/nuvoton,npcm-rng.txt b/Documentation/devicetree/bindings/rng/nuvoton,npcm-rng.txt
> new file mode 100644
> index 000000000000..a697b4425fb3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/rng/nuvoton,npcm-rng.txt
> @@ -0,0 +1,17 @@
> +NPCM SoC Random Number Generator
> +
> +Required properties:
> +- compatible  : "nuvoton,npcm750-rng" for the NPCM7XX BMC.
> +- reg         : Specifies physical base address and size of the registers.
> +
> +Optional property:
> +- quality : estimated number of bits of true entropy per 1024 bits
> +			read from the rng.
> +			If this property is not defined, it defaults to 1000.

Having a controllable quality implies that the numeric quality of the
peripheral changes when it is stamped out on different SoCs (otherwise
the driver can confidently set the quality without needing any hint
from the DT). Is that really true here?


Daniel.

> +
> +Example:
> +
> +rng: rng@...0b000 {
> +	compatible = "nuvoton,npcm750-rng";
> +	reg = <0xf000b000 0x8>;
> +};
> -- 
> 2.18.0
>