GMBUS_SLAVE_WRITE
GMBUS_SLAVE_WRITE | GMBUS_SW_RDY);
gmbus1_index | GMBUS_CYCLE_WAIT | (chunk_size << GMBUS_BYTE_COUNT_SHIFT) | (addr << GMBUS_SLAVE_ADDR_SHIFT) | GMBUS_SLAVE_WRITE | GMBUS_SW_RDY);