GPIO UART1, GPIO Interrupt

hyeonwoo

hi
i would like to use ntp time sync from gps message(GPRMC, GPGGA) in Ubuntu 22.04.
there are some problems using GPIO UART1 and interrupt settings

problem 1. UART1 is not working
i tried GPIO14, 15 as UART input but no message came out from ttyS4

(UART0 (10 pin, ttyS5) -> working good)

problem 2. interrupt is blocked
i tried linux kernel module setting GPIO as /dev/pps

it fails in the process of registering the interrupt (register IRQ)
dmesg said "pin XXX cannot be used as IRQ"

(link: https://github.com/Jobbel/pps-gpio-dtless)
(both upboard pinctrl driver number 0 to 26 and sysfs 6XX~1001 failed)

Wilbert

Hi Sir,

Q1: I will arrange time to test and confirm this problem, can you provide me with your Kernel version?
Q2 : Do you use original control? Or use Pinctrl?

Best Regards,
Wilbert Lee.

Wilbert

Hi Sir,

So far, pinctrl does not support the IRQ function.
As for the sysfs part, I will ask the software engineer to arrange a time to confirm it.

Best Regards,
Wilbert Lee.

hyeonwoo

Thank you for your kind response.

My kernel version is 5.19.0-42.

In addition, i wonder if there are other boards that support IRQ function.

garyw

@hyeonwoo
pinctrl driver not implement interrupt yet, so currently there are a workarund to use it from native GPIO number, you can refer our old page in i11

https://github.com/up-board/up-community/wiki/Pinout_UPXi11

hyeonwoo

@garyw
thank you for answer

I think the native GPIO number you mentioned means the Linux GPIO Number (sysfs).

Currently, i found every native GPIO number corresponding RPi GPIO number, and also confirmed input/output signals.

But failed to set interrupt on native GPIO numbers Too.

These are the correspondences i found

RPi - sysfs
0 - 669
1 - 670
2 - 671
3 - 672
4 - 870
5 - 869
6 - 872
7 - 766
8 - 865
9 - 867
10 - 868
11 - 866
12 - 856
13 - 857
14 - 835
15 - 834
16 - 837
17 - 836
18 - 760
19 - 761
20 - 763
21 - 762
22 - 859
23 - 1001
24 - 764
25 - 765
26 - 871
27 - 858

rajsh

@garyw @hyeonwoo
Any update on the IRQ using Linux sysfs 6XX~1001? I have the same issue on my xtreme i12

[ 1747.299937] mcp2515_init: init
[ 1747.300083] mcp2515_init: irq for pin 859 is 191
[ 1747.318197] mcp2515_init: device created!
[ 1747.327345] CAN device driver interface
[ 1747.341318] mcp251x spi0.0 can0: MCP2515 successfully initialized.
[ 1778.402456] tigerlake-pinctrl INTC1055:00: pin 123 cannot be used as IRQ
[ 1778.402463] genirq: Setting trigger mode 2 for irq 191 failed (intel_gpio_irq_type+0x0/0x130)
[ 1778.402614] mcp251x spi0.0: failed to acquire irq 191
[ 1778.402626] A link change request failed with some changes committed already. Interface can0 may have been left with an inconsistent configuration, please check.

garyw

@rajsh @hyeonwoo
we've release pinctrl-upboard v1.1.0 for interrupt support, you can try it now.