... so that the pin keeps the inactive state of the CSN line when it is
not controlled by the QSPI peripheral and the driver is not suspended.
Currently, the nrf_qspi_nor shim deinitializes the nrfx_qspi driver
after each operation, what leaves the pin uncontrolled until a new
operation is requested (and the nrfx_qspi driver is initialized again)
or the driver is suspended (and the pin is put into low-power state).
This can cause the flash chip to needlessly consume current when there
is no pull-up resistor on its CSN line and the line appears active.
Prevent this by keeping the pin in a defined (inactive) state.
Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>
6d8172f4e9