Armbian 5.15.26-sunxi64 kernel breaks GPIO on NanoPi NEO2

Maarten1 · March 29, 2022

Armbian 5.15.26-sunxi64 (bullseye)

NanoHatOLED fails:

- GPIO devices are missing;

- /proc/cpuinfo lacks Processor, Hardware info.

root@nanopineo2:~# uname -a
Linux nanopineo2 5.15.26-sunxi64 #trunk.0002 SMP Thu Mar 3 10:24:53 UTC 2022 aarch64 GNU/Linux

root@nanopineo2:~# gpio readall
piBoardRev: Unable to determine board revision from /proc/cpuinfo
 -> Is not NanoPi based board.
 ->  You may want to check:
 ->  http://www.lemaker.org/

root@nanopineo2:~# cat /tmp/nanohat-oled.log
open of gpio 0 returned -1: No such file or directory
error opening gpio sysfs entries

root@nanopineo2:~# cat /proc/cpuinfo
processor       : 0
BogoMIPS        : 48.00
Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

processor       : 1
BogoMIPS        : 48.00
Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

processor       : 2
BogoMIPS        : 48.00
Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

processor       : 3
BogoMIPS        : 48.00
Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

Armbian 5.10.60-sunxi64 (bullseye)

NanoHatOLED is running fine:

root@nanopineo2:~# ls -l /sys/class/gpio
total 0
--w--w---- 1 root dialout 4096 Mar 29 23:42 export
lrwxrwxrwx 1 root root       0 Mar 29 23:42 gpio0 -> ../../devices/platform/soc/1c20800.pinctrl/gpiochip1/gpio/gpio0
lrwxrwxrwx 1 root root       0 Mar 29 23:42 gpio2 -> ../../devices/platform/soc/1c20800.pinctrl/gpiochip1/gpio/gpio2
lrwxrwxrwx 1 root root       0 Mar 29 23:42 gpio3 -> ../../devices/platform/soc/1c20800.pinctrl/gpiochip1/gpio/gpio3
lrwxrwxrwx 1 root root       0 Jan  1  1970 gpiochip0 -> ../../devices/platform/soc/1c20800.pinctrl/gpio/gpiochip0
lrwxrwxrwx 1 root root       0 Jan  1  1970 gpiochip352 -> ../../devices/platform/soc/1f02c00.pinctrl/gpio/gpiochip352
--w--w---- 1 root dialout 4096 Mar 29 23:42 unexport

root@nanopineo2:~# gpio readall
 +-----+-----+----------+------+---+-NanoPi-NEO2--+------+----------+-----+-----+
 | BCM | wPi |   Name   | Mode | V | Physical | V | Mode | Name     | wPi | BCM |
 +-----+-----+----------+------+---+----++----+---+------+----------+-----+-----+
 |     |     |     3.3V |      |   |  1 || 2  |   |      | 5V       |     |     |
 |  12 |   8 |  GPIOA12 | ALT5 | 0 |  3 || 4  |   |      | 5V       |     |     |
 |  11 |   9 |  GPIOA11 | ALT5 | 0 |  5 || 6  |   |      | 0v       |     |     |
 | 203 |   7 |  GPIOG11 |  OFF | 0 |  7 || 8  | 0 |  OFF | GPIOG6   | 15  | 198 |
 |     |     |       0v |      |   |  9 || 10 | 0 |  OFF | GPIOG7   | 16  | 199 |
 |   0 |   0 |   GPIOA0 | ALT2 | 0 | 11 || 12 | 0 |  OFF | GPIOA6   | 1   | 6   |
 |   2 |   2 |   GPIOA2 | ALT2 | 0 | 13 || 14 |   |      | 0v       |     |     |
 |   3 |   3 |   GPIOA3 | ALT2 | 0 | 15 || 16 | 0 |  OFF | GPIOG8   | 4   | 200 |
 |     |     |     3.3v |      |   | 17 || 18 | 0 |  OFF | GPIOG9   | 5   | 201 |
 |  64 |  12 |   GPIOC0 |  OFF | 0 | 19 || 20 |   |      | 0v       |     |     |
 |  65 |  13 |   GPIOC1 |  OFF | 0 | 21 || 22 | 0 |  OFF | GPIOA1   | 6   | 1   |
 |  66 |  14 |   GPIOC2 |  OFF | 0 | 23 || 24 | 0 |  OFF | GPIOC3   | 10  | 67  |
 +-----+-----+----------+------+---+----++----+---+------+----------+-----+-----+
 | BCM | wPi |   Name   | Mode | V | Physical | V | Mode | Name     | wPi | BCM |
 +-----+-----+----------+------+---+-NanoPi-NEO2--+------+----------+-----+-----+

 +-----+----NanoPi-NEO2 USB/Audio-+----+
 | BCM | wPi |   Name   | Mode | V | Ph |
 +-----+-----+----------+------+---+----+
 |     |     |       5V |      |   | 25 |
 |     |     |  USB-DP1 |      |   | 26 |
 |     |     |  USB-DM1 |      |   | 27 |
 |     |     |  USB-DP2 |      |   | 28 |
 |     |     |  USB-DM2 |      |   | 29 |
 |     |     |    IR-RX |      |   | 30 |
 |  17 |  19 |  GPIOA17 |  OFF | 0 | 31 |
 |     |     |  PCM/I2C |      |   | 32 |
 |     |     |  PCM/I2C |      |   | 33 |
 |     |     |  PCM/I2C |      |   | 34 |
 |     |     |  PCM/I2C |      |   | 35 |
 |     |     |       0V |      |   | 36 |
 +-----+-----+----------+------+---+----+

 +-----+----NanoPi-NEO2 Debug UART-+----+
 | BCM | wPi |   Name   | Mode | V | Ph |
 +-----+-----+----------+------+---+----+
 |   4 |  17 |   GPIOA4 | ALT5 | 0 | 37 |
 |   5 |  18 |   GPIOA5 | ALT5 | 0 | 38 |
 +-----+-----+----------+------+---+----+

root@nanopineo2:~# ls -l /sys/class/gpio
total 0
--w--w---- 1 root dialout 4096 Mar 29 23:42 export
lrwxrwxrwx 1 root root       0 Mar 29 23:42 gpio0 -> ../../devices/platform/soc/1c20800.pinctrl/gpiochip1/gpio/gpio0
lrwxrwxrwx 1 root root       0 Mar 29 23:42 gpio2 -> ../../devices/platform/soc/1c20800.pinctrl/gpiochip1/gpio/gpio2
lrwxrwxrwx 1 root root       0 Mar 29 23:42 gpio3 -> ../../devices/platform/soc/1c20800.pinctrl/gpiochip1/gpio/gpio3
lrwxrwxrwx 1 root root       0 Jan  1  1970 gpiochip0 -> ../../devices/platform/soc/1c20800.pinctrl/gpio/gpiochip0
lrwxrwxrwx 1 root root       0 Jan  1  1970 gpiochip352 -> ../../devices/platform/soc/1f02c00.pinctrl/gpio/gpiochip352
--w--w---- 1 root dialout 4096 Mar 29 23:42 unexport

Werner · March 31, 2022

Moved to P2P help.

MichaIng · March 31, 2022

Is P2P the right place for a general issue (completely lost GPIO interface) with an officially supported SBC? 🤔

I hope Igor, listed as maintainer for NEO2, reads posts here.

Maarten1 · March 31, 2022

Why is it moved to P2P since NanoPi NEO2 is officially supported and this bug affects others as well?

I do not understand.

MichaIng · April 3, 2022

Now found:

So it is an upstream deprecation, but schwar3kat is looking into a way to restore the sysfs API. But generally, software (like NanoHatOLED) needs to move to recent libraries, like libgpiod then, to make use of GPIO in a future-prove way.

MichaIng · April 3, 2022

Found a kernel config which sounds like it restores /sys/class/gpio, applied a while back on a different kernel: https://github.com/armbian/build/commit/cfc79c1

This is indeed missing for sunxi64 kernel: https://github.com/armbian/build/blob/master/config/kernel/linux-sunxi64-current.config

CONFIG_GPIO_SYSFS=y

Maarten1 · April 5, 2022

Hi MichaIng,

Thanks, does this mean we have to wait if in the next kernel update it will be corrected?

Maarten1 · April 5, 2022

On 4/3/2022 at 2:17 AM, MichaIng said:
Found a kernel config which sounds like it restores /sys/class/gpio, applied a while back on a different kernel: https://github.com/armbian/build/commit/cfc79c1

This is indeed missing for sunxi64 kernel: https://github.com/armbian/build/blob/master/config/kernel/linux-sunxi64-current.config
CONFIG_GPIO_SYSFS=y

Hello @Igor, does the answer by @MichaIng makes sense?

MichaIng · April 5, 2022

The related pull request is up already: https://github.com/armbian/build/pull/3635

This should re-enable the sysfs GPIO interface for all Allwinner 64-bit SBCs, including NanoPi NEO2.

MichaIng · May 30, 2022

Issue solved with latest kernel release, many thanks guys!

Maarten1 · May 30, 2022

Many thanks for the good work !!

Hayotbek Xasanboyev · June 2, 2022

Can you confirm that, on Openwrt GPIO breaked to? I can't get to work GPIO pins for USB.

It's depends linux kernel?

MichaIng · June 2, 2022

At least Linux v5.15 by default has the old sysfs API disabled, so if anything depends on it (has not been migrated to use libgpiod) and it hasn't been explicitly enabled for the build like Armbian did now, then yes.

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Armbian 5.15.26-sunxi64 kernel breaks GPIO on NanoPi NEO2

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