Difference between revisions of "Jetson/FAQ/BSP/Nano Wakeup Pin"
(→Set PG03 GPIO as input) |
(→Set pinmux) |
||
| Line 13: | Line 13: | ||
== Set pinmux == | == Set pinmux == | ||
| − | * Set pinmux as below in ''pinmux@700008d4.common.uart2_cts_pg3'' node | + | * Set pinmux as below in ''pinmux@700008d4.common.uart2_cts_pg3'' node from tegra210-porg-pinmux-p3448-0002-b00.dtsi |
uart2_cts_pg3 { | uart2_cts_pg3 { | ||
nvidia,pins = "uart2_cts_pg3"; | nvidia,pins = "uart2_cts_pg3"; | ||
| Line 21: | Line 21: | ||
nvidia,enable-input = <TEGRA_PIN_ENABLE>; | nvidia,enable-input = <TEGRA_PIN_ENABLE>; | ||
}; | }; | ||
| − | * Make sure uart2_cts_pg3 node '''NOT''' inside of ''pinmux@700008d4.unused_lowpower'' node | + | * Make sure uart2_cts_pg3 node '''NOT''' inside of ''pinmux@700008d4.unused_lowpower'' node from tegra210-porg-pinmux-p3448-0002-b00.dtsi. |
| + | |||
== Create GPIO key to trigger wake up signal == | == Create GPIO key to trigger wake up signal == | ||
Add following node into gpio-keys node. | Add following node into gpio-keys node. | ||
Revision as of 04:16, 20 October 2020
Contents
Environment
Hardware
- Jetson Nano
Software
- JetPack 4.4 (32.4.3)
Use case
Set GPIO(UART1_CTS/PG03) as wake up source to trigger OS resume.
Steps
Note: All changes are in kernel device tree.
Set PG03 GPIO as input
- Make sure TEGRA_GPIO(G, 3) inside of gpio@6000d000.default.gpio-input property from tegra210-porg-gpio-p3448-0002-b00.dtsi
- Make sure TEGRA_GPIO(G, 3) outside of gpio@6000d000.default.gpio-output property from tegra210-porg-gpio-p3448-0002-b00.dtsi
Set pinmux
- Set pinmux as below in pinmux@700008d4.common.uart2_cts_pg3 node from tegra210-porg-pinmux-p3448-0002-b00.dtsi
uart2_cts_pg3 {
nvidia,pins = "uart2_cts_pg3";
nvidia,function = "rsvd2";
nvidia,pull = <TEGRA_PIN_PULL_UP>;
nvidia,tristate = <TEGRA_PIN_DISABLE>;
nvidia,enable-input = <TEGRA_PIN_ENABLE>;
};
- Make sure uart2_cts_pg3 node NOT inside of pinmux@700008d4.unused_lowpower node from tegra210-porg-pinmux-p3448-0002-b00.dtsi.
Create GPIO key to trigger wake up signal
Add following node into gpio-keys node.
wakeup_key {
label = "WakeupKey";
gpios = <&gpio TEGRA_GPIO(G, 3) GPIO_ACTIVE_LOW>;
linux,code = <KEY_POWER>;
gpio-key,wakeup;
debounce-interval = <30>;
nvidia,pmc-wakeup = <&tegra_pmc
PMC_WAKE_TYPE_GPIO 6 PMC_TRIGGER_TYPE_NONE>;
};
Pay attention of nvidia,pmc-wakeup property, the number 6 means wake up ID of Nano. You can find this ID from Column Y of Nano_Module_Pinmux_Config file which comes from Jetson Download Center.
Verification
GPIO PG03 is the Num 36 pin of [J41] 40-pin Exp Header on carrier board. Debug UART RX/TX can provide high voltage even OS suspend. Re-build device tree and re-flash to Nano. After boot completed, exec "sudo systemctl suspend" to suspend OS. Connect that 36 Pin and debug uart RX/TX via Dupont wire to wake up OS.
