Linux/DRA756: GPIO bank sharing between A15 and IPU1

Francesco Valla

Part Number: DRA756

Tool/software: Linux

Hi,

I need to share some gpios of the same GPIO bank between A15 processor (running Linux) and IPU1 (running a RTOS).

I'm planning to avoid read-write-modify issues using GPIO_CLEARDATAOUT and GPIO_SETDATAOUT registers, but I have some concerns about concurrent access to these registers. Is in this case a write collision possible? That is, is there some issue if I write at the same time from A15 and IPU1 to these registers?

Thank you

Regards,

Francesco

over 7 years ago

0 Yordan Kamenov over 7 years ago

TI__Mastermind 42515 points

Hi Francesco,

I have forwarded your question to an expert for comment.

Regards,
Yordan

0 Nikhil Devshatwar over 7 years ago in reply to Yordan Kamenov

TI__Genius 9905 points

Hi,

My outright answer to this will be no.
It is not recommended to control the same hardware from two different drivers independently.

If you want to use the GPIO lines from BIOS, you should send an IPC call and let the Linux side change those pins.
This is the cleaner approach.

Regards,
Nikhil D

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Linux/DRA756: GPIO bank sharing between A15 and IPU1