GPIO numbering

[Viswanadh Chegu]

Hi,

I would like to access the gpio pin 12 using interposer M0076 TP5 at J8

echo 12 > /sys/class/gpio/export 

Not works shows Invalid argument

but

echo 1073 > /sys/class/gpio/export

works

But in voxl2 the numbering is different starts at 1072 and ends at 1280

gpiochip1100 has 180 in ngpio

how to get exact number for gpio pin 12 in relation to above.
can someone tell the mapping of gpio numbers.

[Viswanadh Chegu]

Found the offset
its gpiochip1100
so for gpio 12

echo 1112 > /sys/class/gpio/export

will enable gpio 12