Re: [PATCH] arm64: dts: ti: k3-am62p-j722s: add rng node

From: Kumar, Udit
Date: Fri Mar 28 2025 - 12:15:23 EST


Hello Michael

Thanks for patch

On 3/13/2025 8:11 PM, Michael Walle wrote:
Add the node for the random number generator inside the crypto module.

Signed-off-by: Michael Walle <mwalle@xxxxxxxxxx>
---
This was tested on a J722S/AM67A. Also, according to the TRM this is the

Could you re-confirm please , after adding this node.  you selected trng offered by Linux


MCU instance of the SA3UL. But it's defined in -main.dtsi. Is this
correct?

Yes this is correct,

please refer

https://www.ti.com/lit/zip/sprujb3 ; SPRUJB3A.pdf

table 2.1 Main Memory map, this node falls under main domain

---
arch/arm64/boot/dts/ti/k3-am62p-j722s-common-main.dtsi | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am62p-j722s-common-main.dtsi b/arch/arm64/boot/dts/ti/k3-am62p-j722s-common-main.dtsi
index 6e3beb5c2e01..e868e006318e 100644
--- a/arch/arm64/boot/dts/ti/k3-am62p-j722s-common-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62p-j722s-common-main.dtsi
@@ -227,9 +227,17 @@ crypto: crypto@40900000 {
reg = <0x00 0x40900000 0x00 0x1200>;
#address-cells = <2>;
#size-cells = <2>;
+ ranges = <0x00 0x40900000 0x00 0x40900000 0x00 0x30000>;
+
dmas = <&main_pktdma 0xf501 0>, <&main_pktdma 0x7506 0>,
<&main_pktdma 0x7507 0>;
dma-names = "tx", "rx1", "rx2";
+
+ rng: rng@40910000 {
+ compatible = "inside-secure,safexcel-eip76";
+ reg = <0x00 0x40910000 0x0 0x7d>;
+ interrupts = <GIC_SPI 129 IRQ_TYPE_LEVEL_HIGH>;

For completeness , this is ok to add this node but should be kept disabled

similar to

https://github.com/torvalds/linux/blob/master/arch/arm64/boot/dts/ti/k3-j7200-mcu-wakeup.dtsi#L662



+ };
};
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