of_get_ibm_chip_id
extern int of_get_ibm_chip_id(struct device_node *np);
EXPORT_SYMBOL(of_get_ibm_chip_id);
ret = of_get_ibm_chip_id(np);
opal_lpc_chip_id = of_get_ibm_chip_id(np);
chip = of_get_ibm_chip_id(dn);
chip_id = of_get_ibm_chip_id(dn);
if (cpu_to_chip_id(cpu) == of_get_ibm_chip_id(dn))
chip_id = of_get_ibm_chip_id(pn);
chip_id = of_get_ibm_chip_id(dn);