linux-kernel - [PATCH 2/3] arm: dts: imx6sx: Add entropy delay property

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Message-Id: <20220530180924.1792399-3-vabhav.sharma@nxp.com>
Date:   Mon, 30 May 2022 23:39:23 +0530
From:   Vabhav Sharma <vabhav.sharma@....com>
To:     horia.geanta@....com, gaurav.jain@....com, pankaj.gupta@....com,
        herbert@...dor.apana.org.au, davem@...emloft.net,
        shawnguo@...nel.org, robh+dt@...nel.org
Cc:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        NXP Linux Team <linux-imx@....com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        silvano.dininno@....com, V.Sethi@....com
Subject: [PATCH 2/3] arm: dts: imx6sx: Add entropy delay property

Add imx6sx entropy-delay property.

TRNG self test are run to determine the correct entropy delay.
firmware test is executed with different voltage and temperature to
identify the worst case value for entropy delay. after adding a margin
value(1000),entropy delay should be at least 12000.

Signed-off-by: Vabhav Sharma <vabhav.sharma@....com>
Reviewed-by: Horia Geanta <horia.geanta@....com>
Reviewed-by: Gaurav Jain <gaurav.jain@....com>
---
 arch/arm/boot/dts/imx6sx.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/imx6sx.dtsi b/arch/arm/boot/dts/imx6sx.dtsi
index fc6334336b3d..305fad35f5c4 100644
--- a/arch/arm/boot/dts/imx6sx.dtsi
+++ b/arch/arm/boot/dts/imx6sx.dtsi
@@ -864,6 +864,7 @@ aips2: bus@...0000 {
 
 			crypto: crypto@...0000 {
 				compatible = "fsl,sec-v4.0";
+				entropy-delay = <12000>;
 				#address-cells = <1>;
 				#size-cells = <1>;
 				reg = <0x2100000 0x10000>;
-- 
2.25.1