Hello,
It is not a good idea to leave digital pins left floating since it could draw power, pull-up/pull-down should be enough as you have said.
Even if you're not planning to use it at all you may disable the interface in the dts.
Best regards,
Aldo.
Dear Aldo,
Thank you for your replay.
I see. Even if the pin setting is output, it's better to set pull-up/pull-down, right?
Then, if we set internal Pull-up/Pull-down setting for all pins, we can leave unconnected ECSPI pins in the hardware point of view.
Is my understanding correct?
Best Regards,