John Henry Posted June 26, 2020 Share Posted June 26, 2020 (edited) Hi, I want to use a gpio in CON12 to wakeup orange pi 3. But I can not figure it out. I am using armbian 5.4.43. I have done some researh about this question. It seems the basic process shoule be: 1、choose the right pin to wakeup. Cause some pins can not support interrupt and wakeup event. But I can not find which gpio support wakeup event. It seems I should choose pin on PL or PM ports. But according the schmatic, lots of them have been used as other usages: PIN DEFINE CFG PL0 PMU-SCK 3 PL1 PMU-SDA 3 PL2 RECOVERY 2 PL3 LINK-LED 1 PL4 POW-LED 1 PL5 USB0-DRVVBUS 1 PL6 MUTE 1 PL7 STATUS-LED 1 PL8 PL9 IR-RX 2 PL10 BT-WIFI-ON 1 PM0 WL-WAKE-AP 0 PM1 BT-WAKE-AP 0 PM2 AP-WAKE-AP 1 PM3 WL-REG-ON 1 PM4 BT-REG-ON 1 It seems only PL8 isavailable, but PL8 is also used as PWM pin 2、 write a dts file and let it using gpio-keys driver. For examples choose KEY_WAKEUP. But There need more detail about how to write dts files even after I read some examples. I don't know if I should choose "&pio" or "&r_pio". I can not find any file descript this part. (I have found some descriptiion about PL port and others. &pio is used for PA~PK, &r_pio is used for PL port. And Only Pins on PL port can be used as wakeup source.) (I have test PL8 and PL10. All of them return -22 after reboot when i user dmesg | grep to search gpio. I don't know if I have made some mistake) /dts-v1/; /plugin/; / { compatible = "allwinner,sun50i-h6"; /* * This fragment is needed only for the internal pull-up activation, * external pull-up resistor is highly recommended if using long wires */ fragment@0 { target = <&r_pio>; __overlay__ { gpio_key_wakeup: gpio_key_wakeup { pins = "PL8"; function = "gpio_in"; bias-pull-up; }; }; }; fragment@1 { target-path = "/"; __overlay__ { gpio-keys-user { /* * Use "gpio-keys" for EINT capable pins, "gpio-keys-polled" for other pins * add "poll-interval" property if using "gpio-keys-polled" */ compatible = "gpio-keys"; pinctrl-names = "default"; pinctrl-0 = <&gpio_key_wakeup>; key_wakeup{ label = "GPIO KEY_WAKEUP"; linux,code = <143>; /* KEY_WAKEUP, see include/uapi/linux/input-event-codes.h */ gpios = <&r_pio 0 8 1>; /* PA10 GPIO_ACTIVE_LOW */ }; }; }; }; }; The error message is : opi@orangepi3:~$ dmesg | grep -i gpio [ 2.642632] sun50i-h6-r-pinctrl 7022000.pinctrl: pin PL8 already requested by gpio-keys-user; cannot claim for 7022000.pinctrl:360 [ 2.642646] gpio-keys gpio-keys-user: failed to get gpio: -22 [ 2.642662] gpio-keys: probe of gpio-keys-user failed with error -22 [ 3.343678] sunxi-mmc 4020000.mmc: Got CD GPIO 3、armbian describe we can use "armbian-add-ovelay" to add a custom dts to /boot/user_overlays. But if my dts file have some error if I can delete the relative file directly ? Or I need use other command? (armbian-add-overlay is unavailable for H6 chip. We need to use dtc compile dts file to dtbo and then move it to /boot/overlay-user) 4、add the right ovelay to user-overlays line in /boot/armbianEnv.txt I know it is a old question. But I am so sorry as a newbie can not draw s whole picture about how to use gpio-keys and device tree. Anybody can give me some instructions? Thanks so much! Edited June 27, 2020 by John Henry Add more information 0 Quote Link to comment Share on other sites More sharing options...
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