linux-kernel - [PATCH v2 1/4] arm64: dts: ti: k3-am65-main: Disable RNG node

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Date:   Wed, 6 Jul 2022 14:08:35 -0500
From:   Andrew Davis <afd@...com>
To:     Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     Andrew Davis <afd@...com>
Subject: [PATCH v2 1/4] arm64: dts: ti: k3-am65-main: Disable RNG node

The hardware random number generator is used by OP-TEE and is access is
denied to other users with SoC level bus firewalls. Any access to this
device from Linux will result in firewall errors. Disable this node.

Signed-off-by: Andrew Davis <afd@...com>
---

Changes from v1:
 - Added comment in dtsi file

 arch/arm64/boot/dts/ti/k3-am65-main.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am65-main.dtsi b/arch/arm64/boot/dts/ti/k3-am65-main.dtsi
index e749343accedd..9de5a8294acd6 100644
--- a/arch/arm64/boot/dts/ti/k3-am65-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am65-main.dtsi
@@ -127,6 +127,7 @@ rng: rng@...0000 {
 			reg = <0x0 0x4e10000 0x0 0x7d>;
 			interrupts = <GIC_SPI 24 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&k3_clks 136 1>;
+			status = "disabled"; /* Used by OP-TEE */
 		};
 	};
 
-- 
2.36.1