I’m trying to get the GPIO_CTL register for GPIO17_HEADER40, ie pin 22 on the 40 pin header,ie gpio417 in sysfs, ie GPIO3_PQ.01. I calculated its physical address as 0x02231000. However when I try and mmap it, I always see “0”, and writing to it has no effect. I tried using sysfs to modify the GPIO …

How about probing the signal? Does it reflect your sysfs controlling?

How about probing the signal? Does it reflect your sysfs controlling? Yes, if I use sysfs I can verify the signal with my probe. I think I may have GPIO_ADDR wrong in my code above - or maybe GPIO_SZ? I tried my best to match it to the TRM but again, I could not find the actual GPIO register de…

Hi jrestifo, Is this still an issue to support or you have found the cause? Thanks

mmap a GPIO?

Robotics & Edge Computing Jetson Systems Jetson AGX Xavier

VickNV January 29, 2019, 7:06am 4

Could you take a look at kernel/t18x/drivers/gpio/gpio-tegra186.c to figure out the address?

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mmap a GPIO?

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