How to configure iMX6 (Linux) to power resume via GPIO

normancheung — Tue, 04 Mar 2014 04:37:18 GMT

I have a wandboard iMX6-solo platform with Yocto build. I can set UART as power resume source, but I am not able to do it with GPIO.

with UART, I can do

echo enabled > /sys/de is no /platform/imx-uart.0/tty/ttymxc0/power/wakeup

echo mem > /sys/power/state

Then board go to sleep. And any UART activity will wake up CPU.

But there is NO /sys/class/gpio/gpio<n>/power/wakeup in the gpio /sys/class. I wonder if there is any .config option I need to set in the Linux kernel? Our do I have to setup the GPIO's IRQ as source of wakeup, if so, how?

Thanks,

Norman

Re: How to configure iMX6 (Linux) to power resume via GPIO

AnsonHuang — Tue, 04 Mar 2014 04:54:44 GMT

Hi, Norman

You can refer to power key setting in our BSP, see dts config, you can add the GPIO you want as a power key, then it should be able to wake up from this GPIO, basically, you only need to enable this GPIO's interrupt and unmask this irq in GPC, then system should be able to resume from this GPIO, but there is a demo driver for you to make it happen easier, to set this GPIO as a "power key"

arch/arm/boot/dts/imx6qdl-sabresd.dtsi :

set IOMUX:

561 &iomuxc {

562 pinctrl-names = "default";

563 pinctrl-0 = <&pinctrl_hog_1>;

564

565 hog {

566 pinctrl_hog_1: hoggrp-1 {

567 fsl,pins = <

568 MX6QDL_PAD_GPIO_4__GPIO1_IO04 0x80000000

569 MX6QDL_PAD_GPIO_5__GPIO1_IO05 0x80000000

570 MX6QDL_PAD_NANDF_D0__GPIO2_IO00 0x80000000

571 MX6QDL_PAD_NANDF_D1__GPIO2_IO01 0x80000000

572 MX6QDL_PAD_NANDF_D2__GPIO2_IO02 0x80000000

573 MX6QDL_PAD_NANDF_D3__GPIO2_IO03 0x80000000

574 MX6QDL_PAD_NANDF_ALE__GPIO6_IO08 0x80000000

575 MX6QDL_PAD_NANDF_CLE__GPIO6_IO07 0x80000000

576 MX6QDL_PAD_GPIO_0__CCM_CLKO1 0x130b0

577 MX6QDL_PAD_NANDF_CS2__GPIO6_IO15 0x80000000

578 MX6QDL_PAD_NANDF_CS3__GPIO6_IO16 0x80000000

579 MX6QDL_PAD_EIM_D26__GPIO3_IO26 0x80000000

580 MX6QDL_PAD_EIM_CS1__GPIO2_IO24 0x80000000

581 MX6QDL_PAD_ENET_RXD0__GPIO1_IO27 0x80000000

582 MX6QDL_PAD_EIM_A25__GPIO5_IO02 0x80000000

583 MX6QDL_PAD_EIM_D23__GPIO3_IO23 0x80000000

584 MX6QDL_PAD_ENET_TXD1__GPIO1_IO29 0x80000000

585 MX6QDL_PAD_EIM_D22__GPIO3_IO22 0x80000000

586 MX6QDL_PAD_NANDF_CS0__GPIO6_IO11 0x80000000

587 MX6QDL_PAD_NANDF_CS1__GPIO6_IO14 0x80000000

588 MX6QDL_PAD_EIM_EB3__GPIO2_IO31 0x80000000

589 MX6QDL_PAD_EIM_D16__GPIO3_IO16 0x80000000

590 MX6QDL_PAD_EIM_DA9__GPIO3_IO09 0x80000000

591 MX6QDL_PAD_GPIO_4__GPIO1_IO04 0x80000000

592 MX6QDL_PAD_GPIO_5__GPIO1_IO05 0x80000000

593 MX6QDL_PAD_EIM_D29__GPIO3_IO29 0x80000000

106 gpio-keys {

107 compatible = "gpio-keys";

108 power {

109 label = "Power Button";

110 gpios = <&gpio3 29 1>;

111 linux,code = <116>; /* KEY_POWER */

112 gpio-key,wakeup;

113 };

Re: How to configure iMX6 (Linux) to power resume via GPIO

normancheung — Tue, 04 Mar 2014 18:18:50 GMT

Many thank Yongcai, this is exactly what I was looking for. I will try.

Norman

Re: How to configure iMX6 (Linux) to power resume via GPIO

seanchen — Wed, 10 Sep 2014 07:47:10 GMT

Dear Norman,

Could you please tell me wakeup function workable?

I have customer board and need several gpio to wakeup iMX6.

BR,

Sean.

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How to configure iMX6 (Linux) to power resume via GPIO

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Re: How to configure iMX6 (Linux) to power resume via GPIO