AT91_TWI_RHR
at91_twi_read(dev, AT91_TWI_RHR);
*dev->buf = readb_relaxed(dev->base + AT91_TWI_RHR);
slave_config.src_addr = (dma_addr_t)phy_addr + AT91_TWI_RHR;
value = readb_relaxed(dev->base + AT91_TWI_RHR);