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

[Gedare Bloom (@gedare)]

Gedare Bloom started a new discussion on bsps/aarch64/raspberrypi/i2c/raspberrypi-i2c.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/363#note_121828

 > +static int i2c_polling_read(raspberrypi_i2c_bus *bus){
 > +    while (!(S_REG(bus) & S_DONE ) && (bus->remaining_bytes > 0)) {
 > +        while ((S_REG(bus) & S_RXD ) && (bus->remaining_bytes > 0)) {
 > +            *bus->current_buffer = BCM2835_REG(bus->base_address + BCM2711_I2C_FIFO) & 0xFF;
 > +            bus->current_buffer++;
 > +            bus->remaining_bytes--;
 > +            
 > +            // Check for errors
 > +            if (S_REG(bus) & (S_CLKT | S_ERR)) {
 > +                return -EIO;
 > +            }
 > +        }
 > +        
 > +        // If DONE bit is set but we haven't read all bytes, it's an error
 > +        if ((S_REG(bus) & S_DONE) && 
 > +            bus->remaining_bytes > 0) {

Based on the while loop, I think this is trivially true.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/363#note_121828
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