Jetson/FAQ/BSP/Xavier Wakeup Pin
Contents
Environment
Hardware
- Jetson Xavier
Software
- JetPack 4.4 (32.4.3)
Use case
Set GPIO(STB_REQ_N/Pin L11) as wake up source to trigger OS resume.
Steps
Note: All changes are in kernel device tree.
Create GPIO key to trigger wake up signal
Add following node to hardware/nvidia/platform/t19x/galen/kernel-dts/common/tegra194-p2822-0000-a00.dtsi.
- @@ -16,7 +16,7 @@
- #include "dt-bindings/input/input.h"
- #include "tegra194-audio-p2822-0000.dtsi"
- #include "tegra194-p2822-disp.dtsi"
- -
- +#include <dt-bindings/soc/tegra-pmc.h>
- / {
- sdhci@3400000 {
- mmc-ocr-mask = <0x0>;
- @@ -43,4 +43,16 @@
- gpio-key,wakeup;
- };
- };
- +
- + gpio-keys {
- + wakeup_key {
- + label = "WakeupKey";
- + gpios = <&tegra_main_gpio TEGRA194_MAIN_GPIO(G, 1) GPIO_ACTIVE_LOW>;
- + linux,code = <KEY_SUSPEND>;
- + gpio-key,wakeup;
- + debounce-interval = <30>;
- + nvidia,pmc-wakeup = <&tegra_pmc
- + PMC_WAKE_TYPE_GPIO 68 PMC_TRIGGER_TYPE_HIGH>;
- + };
- + };
- };
Note:
(1) Pay attention of nvidia,pmc-wakeup property, the number 68 means wake up ID of Nano. You can find this ID from Column Y of Xavier_Module_Pinmux_Config file which comes from Jetson Download Center.
(2) If you want a key for suspend purpose, please modify linux,code propriety's value as <KEY_SUSPEND>.
Verification
Re-build device tree and re-flash to Xavier. After boot completed, exec "sudo systemctl suspend" to suspend OS. Connect that Pin and debug STB_REQ_N/Pin L11 via Dupont wire to wake up OS.
