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_125176

 > +
 > +  clock_rate = BSC_CORE_CLK_HZ / divider;
 > +
 > +  while ( clock_rate > clock ) {
 > +    ++divider;
 > +    clock_rate = BSC_CORE_CLK_HZ / divider;
 > +  }
 > +
 > +  BCM2835_REG( bus->base_address + BCM2711_I2C_DIV ) = divider;
 > +
 > +  bus->input_clock = clock_rate;
 > +
 > +  return 0;
 > +}
 > +
 > +static int rpi_i2c_setup_transfer( raspberrypi_i2c_bus *bus )

yeah but `rpi_i2c_setup_transfer` calls `rpi_i2c_bus_transfer()` internally. So this function does both the setup and the transfer.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/363#note_125176
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