Jetson/FAQ/BSP/Xavier Wakeup Pin

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Revision as of 18:29, 24 January 2021 by Jianjunm (talk | contribs) (Create GPIO key to trigger wake up signal)
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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.