arm: exynos: Enable TRNG on E850-96 board
Enable True Random Number Generator (TRNG) on E850-96 board. To do so:
1. Enable DM_RNG and RNG_EXYNOS for TARGET_E850_96
2. Add TRNG node to E850-96 device tree
3. Enable 'rng' command support for easy TRNG testing
TRNG node is already applied in Linux kernel device tree, but it hasn't
appeared in upstream dts yet. Add it in U-Boot override dtsi file
temporarily; it can be removed once it appears in upstream dts.
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/arch/arm/dts/exynos850-e850-96-u-boot.dtsi b/arch/arm/dts/exynos850-e850-96-u-boot.dtsi
index 6d7148f..3aa5d8b 100644
--- a/arch/arm/dts/exynos850-e850-96-u-boot.dtsi
+++ b/arch/arm/dts/exynos850-e850-96-u-boot.dtsi
@@ -3,6 +3,17 @@
* Copyright (c) 2023 Linaro Ltd.
*/
+&soc {
+ /* TODO: Remove this node once it appears in upstream dts */
+ trng: rng@12081400 {
+ compatible = "samsung,exynos850-trng";
+ reg = <0x12081400 0x100>;
+ clocks = <&cmu_core CLK_GOUT_SSS_ACLK>,
+ <&cmu_core CLK_GOUT_SSS_PCLK>;
+ clock-names = "secss", "pclk";
+ };
+};
+
&pmu_system_controller {
bootph-all;
samsung,uart-debug-1;