RTEMS | Add the support for i2c driver in the aarch64/raspberrypi bsp (!363)

[Gedare Bloom (@gedare)]

Gedare Bloom commented on a discussion on bsps/aarch64/raspberrypi/i2c/raspberrypi-i2c.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/363#note_125175

 > +
 > +  bus->input_clock = clock_rate;
 > +
 > +  return 0;
 > +}
 > +
 > +static int rpi_i2c_setup_transfer( raspberrypi_i2c_bus *bus )
 > +{
 > +  int rv;
 > +  while ( bus->remaining_transfers > 0 ) {
 > +    bus->remaining_bytes = bus->remaining_transfers > 1 ?
 > +                             BCM2711_I2C_DLEN_MASK :
 > +                             ( bus->current_buffer_size & BCM2711_I2C_DLEN_MASK
 > +                             );
 > +    BCM2835_REG( bus->base_address + BCM2711_I2C_DLEN ) = bus->remaining_bytes;
 > +    S_REG( bus ) = S_ERR | S_CLKT | S_DONE;

I don't understand how this works, because it means the check of `S_REG(bus) & S_DONE` is true at the start of either `i2c_polling_read` or `i2c_polling_write`. How do you test this case?

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/363#note_125175
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