linux-kernel - [PATCH] arm64: dts: ti: k3-am62: Add RNG node

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Message-ID: <20250926100229.923547-1-s-tripathi1@ti.com>
Date: Fri, 26 Sep 2025 15:32:29 +0530
From: Shiva Tripathi <s-tripathi1@...com>
To: <nm@...com>, <vigneshr@...com>, <praneeth@...com>
CC: <kristo@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kamlesh@...com>, <t-pratham@...com>, <vishalm@...com>,
        <k-malarvizhi@...com>, Shiva Tripathi <s-tripathi1@...com>
Subject: [PATCH] arm64: dts: ti: k3-am62: Add RNG node

Add EIP76 Random Number Generator (RNG) node within crypto engine for
AM62 and AM62A SoCs. The RNG hardware is integrated in crypto
subsystem at address 0x40910000.

Mark the RNG node with status "reserved" as it is intended for use by
OP-TEE for secure random number generation. If required, this hardware
can also be used through Linux kernel by enabling this node.

Signed-off-by: Shiva Tripathi <s-tripathi1@...com>
---
 arch/arm64/boot/dts/ti/k3-am62-main.dtsi  | 10 ++++++++++
 arch/arm64/boot/dts/ti/k3-am62a-main.dtsi | 10 ++++++++++
 2 files changed, 20 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
index 40fb3c9e674c..00148a5ebaa6 100644
--- a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
@@ -209,6 +209,16 @@ crypto: crypto@...00000 {
 		dmas = <&main_pktdma 0xf501 0>, <&main_pktdma 0x7506 0>,
 		       <&main_pktdma 0x7507 0>;
 		dma-names = "tx", "rx1", "rx2";
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges = <0x00 0x40900000 0x00 0x40900000 0x00 0x30000>;
+
+		rng: rng@...10000 {
+			compatible = "inside-secure,safexcel-eip76";
+			reg = <0x00 0x40910000 0x00 0x7d>;
+			interrupts = <GIC_SPI 129 IRQ_TYPE_LEVEL_HIGH>;
+			status = "reserved"; /* Reserved for OP-TEE */
+		};
 	};
 
 	secure_proxy_sa3: mailbox@...00000 {
diff --git a/arch/arm64/boot/dts/ti/k3-am62a-main.dtsi b/arch/arm64/boot/dts/ti/k3-am62a-main.dtsi
index 829f00adea6e..9e5b75a4e88e 100644
--- a/arch/arm64/boot/dts/ti/k3-am62a-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62a-main.dtsi
@@ -247,6 +247,16 @@ crypto: crypto@...00000 {
 		dmas = <&main_pktdma 0xf501 0>, <&main_pktdma 0x7506 0>,
 		       <&main_pktdma 0x7507 0>;
 		dma-names = "tx", "rx1", "rx2";
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges = <0x00 0x40900000 0x00 0x40900000 0x00 0x30000>;
+
+		rng: rng@...10000 {
+			compatible = "inside-secure,safexcel-eip76";
+			reg = <0x00 0x40910000 0x00 0x7d>;
+			interrupts = <GIC_SPI 129 IRQ_TYPE_LEVEL_HIGH>;
+			status = "reserved"; /* Reserved for OP-TEE */
+		};
 	};
 
 	secure_proxy_sa3: mailbox@...00000 {
-- 
2.34.1