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.protse...@linaro.org>
---
arch/arm/dts/exynos850-e850-96-u-boot.dtsi | 11 +++++++++++
arch/arm/mach-exynos/Kconfig | 2 ++
configs/e850-96_defconfig | 1 +
3 files changed, 14 insertions(+)
diff --git a/arch/arm/dts/exynos850-e850-96-u-boot.dtsi
b/arch/arm/dts/exynos850-e850-96-u-boot.dtsi
index 6d7148f7264a..3aa5d8bb10d0 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;
diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
index cad8bb044cf0..3fee5a4299b8 100644
--- a/arch/arm/mach-exynos/Kconfig
+++ b/arch/arm/mach-exynos/Kconfig
@@ -250,6 +250,8 @@ config TARGET_E850_96
select PINCTRL
select PINCTRL_EXYNOS850
imply OF_UPSTREAM
+ imply DM_RNG
+ imply RNG_EXYNOS
endchoice
endif
diff --git a/configs/e850-96_defconfig b/configs/e850-96_defconfig
index 29ad31d5f8ed..7e1e8adb4a0a 100644
--- a/configs/e850-96_defconfig
+++ b/configs/e850-96_defconfig
@@ -14,6 +14,7 @@ CONFIG_ANDROID_BOOT_IMAGE=y
# CONFIG_DISPLAY_CPUINFO is not set
CONFIG_HUSH_PARSER=y
CONFIG_CMD_ABOOTIMG=y
+CONFIG_CMD_RNG=y
CONFIG_CMD_CLK=y
CONFIG_CMD_GPT=y
CONFIG_CMD_MMC=y
--
2.39.2
