Jetson/FAQ/BSP/Xavier Wakeup Pin

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.