Share GPIO bank on i.MX7 (read-only)

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Share GPIO bank on i.MX7 (read-only)

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rfet
Contributor I

Hi,

We would like to share a GPIO bank on i.MX7 between A7 (running on Linux) and M4 (running on FreeRTOS). Knowing that simultaneous writes on GPIOs (without a running RDC under Linux) could lead to collisions, we would write/read GPIOs with A7-core and only read GPIOs with M4-core.

Is there also potential for collision due to uncoordinated read-accesses on same GPIO-Bank?

Regards,
R. Frei

 

 

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kef2
Senior Contributor IV

Only read accesses on one side should be enough, unless you are going to use GPIO interrupts on RO side. For interrupts you should disable whole GPIO peripheral on Linux side.

Regards,

Edward

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