From nobody Mon Feb 9 01:02:09 2026 Received: from mail.manjaro.org (mail.manjaro.org [116.203.91.91]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7BA9920896F; Mon, 2 Dec 2024 14:44:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=116.203.91.91 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733150659; cv=none; b=HgycZRBdh2rjIumAcqE+PlSpfhajjVcZnT9kuf9sebslIrogPUHHEKksZGlrgQwGYh46WE0dtgcwXRkKWHsFqO5E4OUlv0k8XZIH7SEJmatrLVE5UjSBOraBqblU6xxVQ4gSaQ67nUriFwe9LxlYCbj6sdB/utEHhxUDFc0SMQo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733150659; c=relaxed/simple; bh=RhmgU2LQevOuNgGHPl7VYwtenvcTXhvRn2Ebadd1Sxs=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=CwoTUroiHTqk94xE529g2EHF59SayaGCtBWNiVeKnonPJH+n1zoNesLkxPc0HT0NUfF1nWhBZKDb2dJMc6Sj7tNOPi0OIhME1sE4hjgu7LrTQ1W8TCHLZwU+1UBU/HTPA30zcZpDk9yhLVwkP8B3Aoaa/6ecqIHtjjqrZ9ONWBY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=manjaro.org; spf=pass smtp.mailfrom=manjaro.org; dkim=pass (2048-bit key) header.d=manjaro.org header.i=@manjaro.org header.b=PUkoZ0sI; arc=none smtp.client-ip=116.203.91.91 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=manjaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=manjaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=manjaro.org header.i=@manjaro.org header.b="PUkoZ0sI" From: Dragan Simic DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=manjaro.org; s=2021; t=1733150655; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=yRJZlOcms6c9rbeZYvsX5MTDNXpRGMuOjccJ3gJk83o=; b=PUkoZ0sICV8QIm+TzgZgwT/vqL+UjIf3NGBGb4D6j6pG4v29Wgv3b4n0uv1BsxglBCNmIH uODreYlZFOZvBu6Bla55ay6k7a88JO2vegl7w/C1uKNt6atCe4rGTesKRxdMw1lf3ErBdZ SwZY/UPtaJtvmqUt0kSNhPAXX+KO5XvfrbS2EyKPYjw4IOKqcOtGR8FRvKqNT/X9F45v9z pCf63WuI1kut/xi52Pq4ZAZ/L8upFLkVLyChu8t/Es9LeaBkIPoioS66Z/PzSHaGNuSBbd UHXh4KwW+ec1Yq/jgzU8Pfrs1HSxEykI6tlI7PtH2l4+kKPJo3e497eV4UfaWQ== To: linux-rockchip@lists.infradead.org Cc: heiko@sntech.de, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, didi.debian@cknow.org, marcin.juszkiewicz@linaro.org Subject: [PATCH] arm64: dts: rockchip: Describe why is HWRNG disabled in RK356x base dtsi Date: Mon, 2 Dec 2024 15:44:06 +0100 Message-Id: <6b272e2f8f916c04b05db50df621659a5a7f29ab.1733149874.git.dsimic@manjaro.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Authentication-Results: ORIGINATING; auth=pass smtp.auth=dsimic@manjaro.org smtp.mailfrom=dsimic@manjaro.org Content-Type: text/plain; charset="utf-8" Despite the presence of the hardware random number generator (HWRNG) in the different Rockchip RK356x SoC variants, it remains disabled for the RK3566 SoC because testing showed [1] that it produces unacceptably low quality of random data, for some yet unknown reason. The HWRNG is enabled for the RK3= 568 SoC, on which the testing showed good quality of the generated random data. To avoid possible confusion in the future, [2] let's have this described briefly in the RK356x base SoC dtsi. [1] https://lore.kernel.org/linux-rockchip/cover.1720969799.git.daniel@makr= otopia.org/T/#u [2] https://lore.kernel.org/linux-rockchip/20241201234613.52322-1-pbrobinso= n@gmail.com/T/#u Signed-off-by: Dragan Simic Reviewed-by: Diederik de Haas --- arch/arm64/boot/dts/rockchip/rk356x-base.dtsi | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi b/arch/arm64/boo= t/dts/rockchip/rk356x-base.dtsi index 62be06f3b863..ab8f42c0a843 100644 --- a/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi @@ -1032,6 +1032,11 @@ sdhci: mmc@fe310000 { status =3D "disabled"; }; =20 + /* + * Testing showed that the HWRNG found in RK3566 produces unacceptably + * low quality of random data, so the HWRNG isn't enabled for all RK356x + * SoC variants despite its presence. + */ rng: rng@fe388000 { compatible =3D "rockchip,rk3568-rng"; reg =3D <0x0 0xfe388000 0x0 0x4000>;