linux-kernel - Re: [PATCH v5 2/3] hwrng: add hwrng driver for Rockchip RK3568 SoC

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Message-ID: <20901d00-0a7b-432f-a6f1-3efc9b5c8a53@kernel.org>
Date: Wed, 26 Jun 2024 09:31:48 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Daniel Golle <daniel@...rotopia.org>,
 Aurelien Jarno <aurelien@...el32.net>, Olivia Mackall <olivia@...enic.com>,
 Herbert Xu <herbert@...dor.apana.org.au>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>,
 Philipp Zabel <p.zabel@...gutronix.de>,
 Uwe Kleine-König <ukleinek@...ian.org>,
 Dragan Simic <dsimic@...jaro.org>, Sascha Hauer <s.hauer@...gutronix.de>,
 Martin Kaiser <martin@...ser.cx>, Tony Luck <tony.luck@...el.com>,
 Ard Biesheuvel <ardb@...nel.org>, linux-crypto@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/3] hwrng: add hwrng driver for Rockchip RK3568 SoC

On 26/06/2024 03:37, Daniel Golle wrote:
> From: Aurelien Jarno <aurelien@...el32.net>
> 
> Rockchip SoCs used to have a random number generator as part of their
> crypto device, and support for it has to be added to the corresponding
> driver. However newer Rockchip SoCs like the RK3568 have an independent
> True Random Number Generator device. This patch adds a driver for it,
> greatly inspired from the downstream driver.
> 
> The TRNG device does not seem to have a signal conditionner and the FIPS
> 140-2 test returns a lot of failures. They can be reduced by increasing
> RK_RNG_SAMPLE_CNT, in a tradeoff between quality and speed. This value
> has been adjusted to get ~90% of successes and the quality value has
> been set accordingly.
> 
> Signed-off-by: Aurelien Jarno <aurelien@...el32.net>
> [daniel@...rotpia.org: code style fixes]
> Signed-off-by: Daniel Golle <daniel@...rotopia.org>


Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Best regards,
Krzysztof