From: Paul Kocialkowski <cont...@paulk.fr>
The reset mechanism used by Linux to reset the SoC is known to only
partially reset the logic. A mechanism is implemented in
rk3399_force_power_on_reset to use a GPIO connected to the PMIC's
over-temperature (OTP) reset pin, which fully resets all logic.
Hook the associated GPIO where the function expects it to enable this
reset mechanism and avoid any possible side-effect of partially-reset
units.
Without this patch, reading from the micro sd slot fails after a reset.
With this mechanism, U-Boot is able to boot from it reliably.
Signed-off-by: Paul Kocialkowski <cont...@paulk.fr>
---
arch/arm/dts/rk3399-roc-pc-u-boot.dtsi | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/arch/arm/dts/rk3399-roc-pc-u-boot.dtsi
b/arch/arm/dts/rk3399-roc-pc-u-boot.dtsi
index aecf7dbe383c..883d399a06a3 100644
--- a/arch/arm/dts/rk3399-roc-pc-u-boot.dtsi
+++ b/arch/arm/dts/rk3399-roc-pc-u-boot.dtsi
@@ -7,6 +7,10 @@
#include "rk3399-sdram-lpddr4-100.dtsi"
/ {
+ config {
+ sysreset-gpio = <&gpio1 RK_PA6 GPIO_ACTIVE_HIGH>;
+ };
+
vcc_hub_en: vcc_hub_en-regulator {
compatible = "regulator-fixed";
enable-active-high;
@@ -36,6 +40,10 @@
bootph-pre-ram;
};
+&gpio1 {
+ bootph-pre-ram;
+};
+
&spi1 {
flash@0 {
bootph-pre-ram;
--
2.46.2
