The PMUGRF (Power Management Unit - General Register File) of the RK3568
has a general purpose register checked by the BootROM on power-on to
decide on whether to drop to recovery mode (rk-usb-loader/rkdeveloptool).
Describe this in the device tree, so it's possible to use, e.g.
global.system.reboot_mode.next=serial reset
to force falling into serial (USB) boot mode.
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
arch/arm/dts/rk356x.dtsi | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/arch/arm/dts/rk356x.dtsi b/arch/arm/dts/rk356x.dtsi
index 923e18e7ccda..7fd5f72a5918 100644
--- a/arch/arm/dts/rk356x.dtsi
+++ b/arch/arm/dts/rk356x.dtsi
@@ -1,6 +1,12 @@
// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+#include <dt-bindings/soc/rockchip,boot-mode.h>
+
/ {
+ aliases {
+ pmugrf.reboot_mode = &reboot_mode_pmugrf;
+ };
+
chosen {
barebox,bootsource-mmc0 = &sdhci;
barebox,bootsource-mmc1 = &sdmmc0;
@@ -31,3 +37,12 @@ rng: rng@fe388000 {
resets = <&cru SRST_TRNG_NS>;
};
};
+
+&pmugrf {
+ reboot_mode_pmugrf: reboot-mode {
+ compatible = "syscon-reboot-mode";
+ offset = <0x200>;
+ mode-normal = <BOOT_NORMAL>;
+ mode-serial = <0xef08a53c>; /* rk-usb-loader */
+ };
+};
--
2.39.2
